If possible, try to scan your vehicle. You can read your check engine light with or without a scanner and get an exact diagnosis rather than rely only on your powers of deduction.
But, if you are on the side of the road and in a rush, this list of common causes for each Hyundai model should help you narrow down the most likely cause of your issue.
Take a look through the tables below for the most common causes for your Hyundai models’ Check Engine Light. If none of the causes below match the symptoms you’re experiencing or if you want a more in depth explanation of the common causes, go ahead and check out “The 13 Most Common Causes For A Check Engine Light | How To Diagnose Them”.
When you are ready to read your code, check out the FIXD sensor or, our other resources:
How to Read a Check Engine Light With or Without a Scanner
Where To Get Your Check Engine Light Codes Checked For Free
Let’s dive in.
Chevrolet Astro CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0101 | Engine air filter is very dirty | Replace the engine air filter | Air filter $50-70 |
| Mass airflow sensor is dirty or broken | Replace the mass airflow sensor | Mass air flow sensor $220-320 |
| Catalytic converter is damaged or worn | Replace the catalytic converter | Catalytic converter $1720-1780 |
| #3 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #4 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #5 | P0121 | Faulty mass airflow sensor | Replace mass airflow sensor | Mass airflow sensor: $230 – $330 |
| Faulty air filter | Replace air filter | Air filter: $50 – $70 |
Chevrolet Avalanche CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Avalanche Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0455 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0521 | Low oil level | Add oil to your engine | Top off oil: $5 to $10 |
| Dirty oil | Change oil and oil filter | Oil and filter change: $136 to $149 |
| Leaking oil pan | Replace oil pan | Oil pan replacement: $654 to $740 |
| Broken oil pressure sensor | Replace oil pressure sensor | Oil pressure sensor: $123 to $140 |
| #3 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #4 | P0449 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #5 | P0121 | Faulty throttle body actuator | Replace throttle body actuator | Throttle body actuator $570-$700 |
| Faulty throttle body position sensor | Replace throttle body position sensor | Throttle position sensor $170-$230 |
| Faulty accelerator pedal position sensor | Replace accelerator pedal position sensor | Accelerator pedal position sensor $130-$200 |
| Damaged wiring | Repair/replace wiring | Wiring repair/replacement $100-$1000 |
Chevrolet Avalanche 1500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Tighten or replace gas cap | Temperature sensor: $392 – $427 |
| #2 | P0449 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #5 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
Chevrolet AVEO CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P2135 | Faulty throttle body actuator | Replace throttle body actuator | Throttle body actuator $570-$700 |
| Faulty throttle body position sensor | Replace throttle body position sensor | Throttle position sensor $170-$230 |
| Faulty accelerator pedal position sensor | Replace accelerator pedal position sensor | Accelerator pedal position sensor $130-$200 |
| Damaged wiring | Repair/replace wiring | Wiring repair/replacement $100-$1000 |
| #5 | P0340 | Faulty camshaft position sensor | Replace camshaft position sensor | Camshaft position sensor $120-$300 |
| Faulty crankshaft position sensor | Replace crankshaft position sensor | Crankshaft position sensor $190-$250 |
| Faulty ECM | Replace ECM | ECM $1000-$1200 |
| Faulty timing chain or belt replacement | Replace timing chain or belt replacement | Timing chain or belt replacement $200-$1000 |
Chevrolet Blazer CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #5 | P0440 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
Chevrolet C1500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0304 | Spark plug #4 is worn or broken | Replace spark plug #4 | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #3 | P1345 | On newer vehicles: Camshaft or crankshaft position sensor | Replace camshaft or crankshaft position sensor | Camshaft position sensor: $200 – $400 |
| On older vehicles: Stretched timing chain | Replace stretched timing chain | Crankshaft position sensor: $175 – $230 |
| | | Timing chain: $1,624 to $1,879 |
| #4 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #5 | P0102 | Faulty mass airflow sensor | Replace mass airflow sensor | Mass airflow sensor: $230 – $330 |
| Faulty air filter | Replace air filter | Air filter: $50 – $70 |
Chevrolet C1500 Suburban CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0140 | Faulty oxygen sensor | Replace oxygen sensor | Oxygen sensor: $200 – $300 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Mass airflow sensor: $230 – $330 |
Chevrolet C2500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0102 | Faulty mass airflow sensor | Replace mass airflow sensor | Mass airflow sensor: $230 – $330 |
| Faulty air filter | Replace air filter | Air filter: $50 – $70 |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #4 | P1345 | On newer vehicles: Camshaft or crankshaft position sensor | Replace camshaft or crankshaft position sensor | Camshaft position sensor: $200 – $400 |
| On older vehicles: Stretched timing chain | Replace stretched timing chain | Crankshaft position sensor: $175 – $230 |
| | | Timing chain: $1,624 to $1,879 |
Chevrolet C3500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P1345 | On newer vehicles: Camshaft or crankshaft position sensor | Replace camshaft or crankshaft position sensor | Camshaft position sensor: $200 – $400 |
| On older vehicles: Stretched timing chain | Replace stretched timing chain | Crankshaft position sensor: $175 – $230 |
| | | Timing chain: $1,624 to $1,879 |
| #2 | P0102 | Faulty mass airflow sensor | Replace mass airflow sensor | Mass airflow sensor: $230 – $330 |
| Faulty air filter | Replace air filter | Air filter: $50 – $70 |
Chevrolet Camaro CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Camaro Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #4 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #5 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
Chevrolet Caprice CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0441 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
| #2 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #3 | P0400 | Stuck EGR valve | Replace the EGR valve | EGR valve: $250 – $350 |
| Faulty EGR temperature sensor | Replace the EGR temperature sensor | EGR temperatute sensor: $220 – $230 |
| #4 | P0305 | Spark plug #5 is worn or broken | Replace spark plug #5 | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #5 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
Chevrolet Captiva Sport CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0013 | Faulty camshaft sensor | Replace camshaft sensor | Camshaft sensor: $200 – $400 |
| Faulty oil control valve | Replace oil control valve | Oil control valve: $300 – $600 |
| #2 | P0011 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
| #3 | P0014 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
| #4 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P0010 | Faulty replace VVT Control Solenoid | Replace VVT Control Solenoid | VVT Control Solenoid $500-$600 |
| Faulty camshaft position sensor | Replace camshaft position sensor | Camshaft position sensor $120-$300 |
| Faulty crankshaft position sensor | Replace crankshaft position sensor | Crankshaft position sensor $190-$250 |
| Faulty timing chain or belt | Replace timing chain or belt | Timing chain or belt replacement $200-$1000 |
Chevrolet Cavalier CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0440 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
| #2 | P0442 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
Chevrolet Classic CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0442 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
Chevrolet Cobalt CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Cobalt Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #2 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #3 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0442 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #5 | P0135 | Faulty upstream oxygen sesnor | Replace oxygen sensor | Oxygen Sensor $200-$300 |
| Blown fuse | Replace fuse | Fuse $5 |
| Damaged or shorted wiring or connections | Replace or repair wiring | Wiring repair/replacement $100-$1000 |
Chevrolet Colorado CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Colorado Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #2 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0017 | Low oil/dirty oil | Get an oil change or add oil | Engine oil and filter change $20-$60 |
| Timing chain is stretched | Replace timing chain | Timing chain: $1,624 to $1,879 |
| Slipped reluctor ring on the crankshaft | Replace reluctor ring | Reluctor ring $200-$600 |
| #5 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Corvette CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #2 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #3 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #4 | P0410 | Blown air injector fuse | Replace air injector fuse | Fuse: $10 |
| Faulty air pump | Replace air pump | Air Pump: $570-$710 |
| Faulty air pump relay | Replace air pump relay | Air Pump Relay: $50-$75 |
| #5 | P2068 | Faulty fuel level sensor | Replace fuel level sensor | Fuel level sensor: $940 – $1080 |
Chevrolet Cruze CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Cruze Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P1101 | Faulty mass airflow sensor | Replace the mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor harness | Replace the mass airflow sensor harness | Replace mass airflow sensor: $230 – $330 |
| Dirty air filter | Replace air filter | Replace air filter: $20 – $80 |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0299 | Faulty turbo or supercharger | Replace turbo or supercharger | Turbo or supercharger: $300 – $3400 |
| Faulty boost pressure sensor | Replace boost pressure sensor | Boost pressure sensor: $200 – $220 |
| #4 | P0420 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P0496 | Faulty EVAP Purge Volume Control Valve | Replace EVAP purge volume control valve | EVAP Purge Volume Control Valve $150-$200 |
| Leaking EVAP system hose | Replace EVAP line | EVAP Line $20-$100 |
| Faulty EVAP pressure sensor | EVAP pressure sensor | EVAP Pressure Sensor $280-$330 |
Chevrolet Cruze Limited CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #2 | P1101 | Faulty mass airflow sensor | Replace the mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor harness | Replace the mass airflow sensor harness | Replace mass airflow sensor: $230 – $330 |
| Dirty air filter | Replace air filter | Replace air filter: $20 – $80 |
| #3 | P0496 | Faulty EVAP Purge Volume Control Valve | Replace EVAP purge volume control valve | EVAP Purge Volume Control Valve $150-$200 |
| Leaking EVAP system hose | Replace EVAP line | EVAP Line $20-$100 |
| Faulty EVAP pressure sensor | EVAP pressure sensor | EVAP Pressure Sensor $280-$330 |
| | | |
| #4 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P0299 | Faulty turbo or supercharger | Replace turbo or supercharger | Turbo or supercharger: $300 – $3400 |
| Faulty boost pressure sensor | Replace boost pressure sensor | Boost pressure sensor: $200 – $220 |
Chevrolet Equinox CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Equinox Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0014 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
| #3 | P0013 | Faulty camshaft sensor | Replace camshaft sensor | Camshaft sensor: $200 – $400 |
| Faulty oil control valve | Replace oil control valve | Oil control valve: $300 – $600 |
| #4 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #5 | P0011 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
Chevrolet Express 1500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #3 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #4 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #5 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
Chevrolet Express 2500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #5 | P0442 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Express 3500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet HHR CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #2 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0010 | Faulty replace VVT Control Solenoid | Replace VVT Control Solenoid | VVT Control Solenoid $500-$600 |
| Faulty camshaft position sensor | Replace camshaft position sensor | Camshaft position sensor $120-$300 |
| Faulty crankshaft position sensor | Replace crankshaft position sensor | Crankshaft position sensor $190-$250 |
| Faulty timing chain or belt | Replace timing chain or belt | Timing chain or belt replacement $200-$1000 |
| #5 | P0013 | Faulty camshaft sensor | Replace camshaft sensor | Camshaft sensor: $200 – $400 |
| Faulty oil control valve | Replace oil control valve | Oil control valve: $300 – $600 |
Chevrolet Impala CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #3 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #4 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #5 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
Chevrolet Impala Limited CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Impala Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0496 | Faulty EVAP Purge Volume Control Valve | Replace EVAP purge volume control valve | EVAP Purge Volume Control Valve $150-$200 |
| Leaking EVAP system hose | Replace EVAP line | EVAP Line $20-$100 |
| Faulty EVAP pressure sensor | EVAP pressure sensor | EVAP Pressure Sensor $280-$330 |
| #3 | P0442 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0443 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #5 | P0011 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
Chevrolet K1500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P1345 | On newer vehicles: Camshaft or crankshaft position sensor | Replace camshaft or crankshaft position sensor | Camshaft position sensor: $200 – $400 |
| On older vehicles: Stretched timing chain | Replace stretched timing chain | Crankshaft position sensor: $175 – $230 |
| | | Timing chain: $1,624 to $1,879 |
| #2 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #3 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #4 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
Chevrolet K1500 Suburban CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P1345 | On newer vehicles: Camshaft or crankshaft position sensor | Replace camshaft or crankshaft position sensor | Camshaft position sensor: $200 – $400 |
| On older vehicles: Stretched timing chain | Replace stretched timing chain | Crankshaft position sensor: $175 – $230 |
| | | Timing chain: $1,624 to $1,879 |
Chevrolet K3500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0134 | Faulty upstream oxygen sensor | Replace oxygen sensor | Oxygen Sensor $200-$300 |
| Damaged or shorted wiring or connections | Replace or repair wiring | Wiring repair/replacement $100-$1000 |
| #2 | P0102 | Faulty mass airflow sensor | Replace mass airflow sensor | Mass airflow sensor: $230 – $330 |
| Faulty air filter | Replace air filter | Air filter: $50 – $70 |
Chevrolet Lumina CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0440 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0401 | Faulty EGR valve | Replace EGR valve | EGR valve: $332 to $413 |
| Engine vacuum leak | Fix vacuum leak | Vacuum leak: $90 to $125 |
| #4 | P0446 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Malibu CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Malibu Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #2 | P0013 | Faulty camshaft sensor | Replace camshaft sensor | Camshaft sensor: $200 – $400 |
| Faulty oil control valve | Replace oil control valve | Oil control valve: $300 – $600 |
| #3 | P0010 | Faulty replace VVT Control Solenoid | Replace VVT Control Solenoid | VVT Control Solenoid $500-$600 |
| Faulty camshaft position sensor | Replace camshaft position sensor | Camshaft position sensor $120-$300 |
| Faulty crankshaft position sensor | Replace crankshaft position sensor | Crankshaft position sensor $190-$250 |
| Faulty timing chain or belt | Replace timing chain or belt | Timing chain or belt replacement $200-$1000 |
| #4 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P1101 | Faulty mass airflow sensor | Replace the mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor harness | Replace the mass airflow sensor harness | Replace mass airflow sensor: $230 – $330 |
| Dirty air filter | Replace air filter | Replace air filter: $20 – $80 |
Chevrolet Malibu Limited CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0741 | Faulty Torque Converter Lockup Solenoid | Replace Torque Converter Lockup Solenoid | Torque Converter Lockup Solenoid: $110 – $300 |
| Faulty Engine Coolant Temperature Sensor | Replace Engine Coolant Temperature Sensor | Engine Coolant Temperature Sensor: $392 – $427 |
| Faulty Torque Converter Clutch | Faulty Torque Converter Clutch | Torque Converter Clutch: $600 – $1200 |
| #2 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
Chevrolet Monte Carlo CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| | | |
| #4 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #5 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
Chevrolet Prizm CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0446 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #5 | P0440 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
Chevrolet S10 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0440 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P0410 | Blown air injector fuse | Replace air injector fuse | Fuse: $10 |
| Faulty air pump | Replace air pump | Air Pump: $570-$710 |
| Faulty air pump relay | Replace air pump relay | Air Pump Relay: $50-$75 |
Chevrolet Silverado 1500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Silverado 1500 Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0449 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Replace temperature sensor | Temperature sensor: $392 – $427 |
| #5 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Silverado 1500 Classic CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0449 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Replace temperature sensor | Temperature sensor: $392 – $427 |
| #3 | P0455 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0442 | Missing, loose, or damaged gas cap | Tighten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Silverado 1500 HD CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0101 | Engine air filter is very dirty | Replace the engine air filter | Air filter $50-70 |
| Mass airflow sensor is dirty or broken | Replace the mass airflow sensor | Mass air flow sensor $220-320 |
| Catalytic converter is damaged or worn | Replace the catalytic converter | Catalytic converter $1720-1780 |
| #4 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Replace temperature sensor | Temperature sensor: $392 – $427 |
Chevrolet Silverado 2500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #4 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Replace temperature sensor | Temperature sensor: $392 – $427 |
Chevrolet Silverado 2500 HD CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0101 | Engine air filter is very dirty | Replace the engine air filter | Air filter $50-70 |
| Mass airflow sensor is dirty or broken | Replace the mass airflow sensor | Mass air flow sensor $220-320 |
| Catalytic converter is damaged or worn | Replace the catalytic converter | Catalytic converter $1720-1780 |
| #2 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #3 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #4 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Replace temperature sensor | Temperature sensor: $392 – $427 |
| #5 | P0700 | Defective shift solenoids | Replace shift solenoids | Shift solenoid: $200 – $500 |
| Defective Valve Body | Replace valve Body | Valve Body: $300 – $1000 |
| Faulty Transmission | Replace Transmission | Transmission: $1800 – $3400 |
Chevrolet Silverado 2500 HD Classic CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #4 | P0674 | Glow plug failure | Replace glow plug | Glow plug: $230 – $290 |
Chevrolet Silverado 3500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0050 | Faulty upstream oxygen sensor | Replace upstream oxygen sensor | Oxygen sensor: $275 – $500 |
| #2 | P0700 | Defective shift solenoids | Replace shift solenoids | Shift solenoid: $200 – $500 |
| Defective Valve Body | Replace valve Body | Valve Body: $300 – $1000 |
| Faulty Transmission | Replace Transmission | Transmission: $1800 – $3400 |
| #3 | P0101 | Engine air filter is very dirty | Replace the engine air filter | Air filter $50-70 |
| Mass airflow sensor is dirty or broken | Replace the mass airflow sensor | Mass air flow sensor $220-320 |
| Catalytic converter is damaged or worn | Replace the catalytic converter | Catalytic converter $1720-1780 |
Chevrolet Silverado 3500 Classic CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #2 | P0678 | Glow plug failure | Replace glow plug | Glow plug: $230 – $290 |
Chevrolet Silverado 3500 HD CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0674 | Glow plug failure | Replace glow plug | Glow plug: $230 – $290 |
Chevrolet Sonic CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Sonic Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #2 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0496 | Faulty EVAP Purge Volume Control Valve | Replace EVAP purge volume control valve | EVAP Purge Volume Control Valve $150-$200 |
| Leaking EVAP system hose | Replace EVAP line | EVAP Line $20-$100 |
| Faulty EVAP pressure sensor | EVAP pressure sensor | EVAP Pressure Sensor $280-$330 |
| #4 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #5 | P0597 | Faulty thermostat | Replace the thermostat | Thermostat: $140 – $300 |
Chevrolet Spark CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0597 | Faulty thermostat | Replace the thermostat | Thermostat: $140 – $300 |
| #2 | P0700 | Defective shift solenoids | Replace shift solenoids | Shift solenoid: $200 – $500 |
| Defective Valve Body | Replace valve Body | Valve Body: $300 – $1000 |
| Faulty Transmission | Replace Transmission | Transmission: $1800 – $3400 |
| #3 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #4 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
Chevrolet SSR CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0443 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
Chevrolet Suburban CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #2 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Spark plug wires: $180-$240 |
| #4 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Suburban 1500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Suburban Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #2 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #5 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
Chevrolet Suburban 2500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P2135 | Faulty throttle body actuator | Replace throttle body actuator | Throttle body actuator $570-$700 |
| Faulty throttle body position sensor | Replace throttle body position sensor | Throttle position sensor $170-$230 |
| Faulty accelerator pedal position sensor | Replace accelerator pedal position sensor | Accelerator pedal position sensor $130-$200 |
| Damaged wiring | Repair/replace wiring | Wiring repair/replacement $100-$1000 |
| #2 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0332 | Faulty knock sensor | Replace knock sensor | Knock sensor: $297 – $381 |
| Faulty knock sensor harness | Replace knock sensor harness | Knock sensor harness: $14 – $66 |
| Faulty temperature sensor | Replace temperature sensor | Temperature sensor: $392 – $427 |
| #4 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
Chevrolet Tahoe CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Tahoe Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Spark plug wires: $180-$240 |
| #2 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #5 | P0174 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak: $100 – $200 |
| Clogged fuel injectors | Clean fuel injectors | Clean fuel injectors: $50 – $80 |
Chevrolet Tracker CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0400 | Stuck EGR valve | Replace the EGR valve | EGR valve: $250 – $350 |
| Faulty EGR temperature sensor | Replace the EGR temperature sensor | EGR temperatute sensor: $220 – $230 |
| #2 | P0442 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #3 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #4 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Trailblazer CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Trailblazer Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #2 | P0014 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #5 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
Chevrolet Trailblazer EXT CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0014 | Engine oil is low or dirty | Get an oil change | Oil Change $20-$60 |
| Camshaft variable timing solenoid failure | Replace oil control valve/variable valve timing control solenoid | Oil Control Valve/Variable Valve Timing Control Solenoid $300-$400 |
| Engine failure | Replace engine | Engine $3000-$4000 |
| #2 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #3 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
| #5 | P0526 | Engine cooling fan control module failure | Replace engine cooling fan control module failure | Engine cooling fan control module: $800 – $900 |
| Engine cooling fan failure | Replace engine cooling fan failure | Engine cooling fan: $100 – $400 |
| Engine cooling fan relay failure | Replace cooling fan relay failure | Cooling fan relay: $70 – $80 |
Chevrolet Traverse CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
For more details visit our Chevrolet Traverse Check Engine Light article.
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0008 | Faulty timing chain | Replace timing chain | Timing chain $600-$1200 |
| Faulty reluctor ring | Replace reluctor ring | Reluctor ring $200-$600 |
| #2 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #3 | P0017 | Low oil/dirty oil | Get an oil change or add oil | Engine oil and filter change $20-$60 |
| Timing chain is stretched | Replace timing chain | Timing chain: $1,624 to $1,879 |
| Slipped reluctor ring on the crankshaft | Replace reluctor ring | Reluctor ring $200-$600 |
| | | |
| #4 | P0430 | Damaged or worn out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair |
| #5 | P0496 | Faulty EVAP Purge Volume Control Valve | Replace EVAP purge volume control valve | EVAP Purge Volume Control Valve $150-$200 |
| Leaking EVAP system hose | Replace EVAP line | EVAP Line $20-$100 |
| Faulty EVAP pressure sensor | EVAP pressure sensor | EVAP Pressure Sensor $280-$330 |
Chevrolet Trax CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #2 | P1101 | Faulty mass airflow sensor | Replace the mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor harness | Replace the mass airflow sensor harness | Replace mass airflow sensor: $230 – $330 |
| Dirty air filter | Replace air filter | Replace air filter: $20 – $80 |
| #3 | P0496 | Faulty EVAP Purge Volume Control Valve | Replace EVAP purge volume control valve | EVAP Purge Volume Control Valve $150-$200 |
| Leaking EVAP system hose | Replace EVAP line | EVAP Line $20-$100 |
| Faulty EVAP pressure sensor | EVAP pressure sensor | EVAP Pressure Sensor $280-$330 |
| #4 | P0420 | Damaged or worn-out catalytic converter | Replace catalytic converter | Replace catalytic converter: $400-$2400 |
| Broken O2 sensor | Replace downstream O2 sensor | Oxygen sensor replacement: $275-$500 |
| Exhaust leak | Seal exhaust leak | Exhaust leak: $100-$200 (if welded to repair) |
| #5 | P0299 | Faulty turbo or supercharger | Replace turbo or supercharger | Turbo or supercharger: $300 – $3400 |
| Faulty boost pressure sensor | Replace boost pressure sensor | Boost pressure sensor: $200 – $220 |
Chevrolet Uplander CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0449 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #2 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #3 | P0455 | Missing, loose, or damaged gas cap | TIghten or replace gas cap | Missing or damaged gas cap: $0-$20 |
| Leak in EVAP line | Fix leap in EVAP line | EVAP line: $20-$100 |
| EVAP vent control valve is damaged or stuck | Replace EVAP vent control valve | EVAP vent control valve: $150-$200 |
| EVAP purge volume control valve is damaged or stuck | Replace EVAP purge volume control valve | Purge volume control valve: $150-$200 |
| #4 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
Chevrolet Venture CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P0135 | Faulty upstream oxygen sensor | Replace oxygen sensor | Oxygen Sensor $200-$300 |
| Blown fuse | Replace fuse | Fuse $5 |
| Damaged or shorted wiring or connections | Replace or repair wiring | Wiring repair/replacement $100-$1000 |
| #2 | P0440 | Damaged charcoal cannister | Replace charcoal cannister | Replace charcoal cannister: $753 – $1000 |
| Loose or missing gas cap | Replace or tighten gas cap | Replace or tighten gas cap: $0 – $20 |
| Faulty purge valve | Replace purge valve | Replace purge valve: $109 – $172 |
| #3 | P0171 | Dirty mass airflow sensor | Clean mass airflow sensor | Clean mass airflow sensor: $20 – $100 |
| Faulty mass airflow sensor | Replace mass airflow sensor | Replace mass airflow sensor: $230 – $330 |
| Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket | Seal vacuum leak | Vacuum leak $100 – $200 |
| #4 | P0128 | Faulty engine coolant thermostat | Replace engine coolant thermostat | Replace engine coolant thermostat: $40 – $190 |
| #5 | P0300 | Spark plug is worn or broken | Replace spark plugs | Spark plugs: $66-$250 |
| Ignition coils are broken | Replace ignition coils | Ignition Coils: $230-$640 (some cars require Intake manifold removal) |
| Spark plug wires are worn | Replace spark plug wires | Spark plug wires: $180-$240 |
| Fuel injectors are broken | Replace fuel injectors | Fuel injectors: $1500-$1900 |
Chevrolet Volt CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs
| | DTC Codes | Most Common Causes | Repair | Repair Cost |
| #1 | P1FFF | Faulty coolant level sensor | Replace coolant level sensor | Coolant level sensor: $330 – $350 |
| #2 | P0401 | Faulty EGR valve | Replace EGR valve | EGR valve: $332 to $413 |
| Engine vacuum leak | Fix vacuum leak | Vacuum leak: $90 to $125 |
FAQs – Chevrolet Check Engine Light
How long can you drive with the check engine light?
Depending on how serious your Check Engine Light is, you may not want to drive. According to FIXD’s data on Check Engine Light causes, 40% of all Check Engine Lights are serious. Before you continue driving, pull over and figure out why it’s on.
If you have a Flashing Check Engine Light, the issue is likely serious. Misfires, a common cause of a flashing light, can cause severe and expensive engine damage. Unburnt fuel can Chevrolet it into your exhaust and destroy your catalytic converter, which can cost over $1000 to replace. If your light is flashing, you probably want to get a tow, it will be cheaper in the long run.
If you have a Solid Check Engine Light or one that goes on and off seemingly at random or only under certain conditions (like hard acceleration), you may not need to get a tow and can probably drive a few days without a problem. But, you should pull over to check for common problems just to Chevrolet sure the light is not an early warning sign of a larger issue like your car overheating, leaking fluids, or not pumping coolant or oil. Just get to a safe spot and check for the most common cause first: A loose gas cap. If that’s all it is, tighten it up and be on your way, the light should reset itself. If not, check out: What to Do When Your Check Engine Light Comes on. Checking for symptoms like rough idling, loud exhaust, or other warning lights will help you rule out a more serious problem.
Is it safe to drive your Chevrolet with the check engine light on?
It’s usually safe to drive your car for a few days with your Check Engine Light on as long as it’s not flashing. Some problems like engine misfires, which generally cause your Check Engine Light to flash, can make your car harder to control and can even start a fire in your car if left untreated for long enough.
Although most times it’s safe to drive with your Check Engine Light on, you should always find out why it’s on ASAP. If something is seriously wrong with your car, the longer you drive, the higher the risk of costly repairs. According to FIXD’s data on Check Engine Light causes, 40% of all Check Engine Lights are serious.
What Does the Check Engine Light Mean?
When your Check Engine Light is on it means your car has identified a problem with the engine or transmission. There are over 1000 problems that can trigger a check engine light. Some are minor like a loose gas cap. Some, like an engine misfire, are more serious and can cause engine failure and/or damage.
The only way to know for sure what’s causing the check engine light is to diagnose it yourself or have a mechanic diagnose it. If you’d like to save some money; learning how to scan your car’s computer with a code reader isn’t hard and doing so will show you what system in your car is broken and you can narrow it down to likely repairs from there. This can help you decide if you can fix it or at the very least keep you from being overcharged at the mechanic. You can buy a small scanner like FIXD that fits in a glovebox, pocket, or purse if you want a clear answer on the severity of your light before you start driving again. Or check out: Where To Get Your CEL Checked if you need to find somewhere to get it checked fast.
What Does the Check Engine Light Look Like?
The check engine light is typically a yellow, orange, or red light in the shape of an engine on your car’s dashboard. Depending on the car, it might include the words “Check” or “Service Engine” inside or next to the engine symbol. The light might be solid or flashing depending on the cause of the check engine light.
