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GMC Check Engine Light | Top 5 Causes for Each Model

FIXD Research Team
March 14, 2023

Diagnose and clear your check engine light!

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.

GMC Acadia CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

For more details visit our GMC Acadia 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	Replace catalytic converter: $400-$2400
		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	P0008	Faulty timing chain	Replace timing chain	Timing chain $600-$1200
#4	P0008	Faulty reluctor ring	Replace reluctor ring	Reluctor ring $200-$600
#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

GMC Acadia Limited CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

	DTC Codes	Most Common Causes	Repair	Repair Cost
#1	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
#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	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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $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

GMC 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	P0430	Damaged or worn out catalytic converter	Replace catalytic converter	Replace catalytic converter: $400-$2400
		Broken O2 sensor	Replace downstream O2 sensor	Replace catalytic converter: $400-$2400
		Exhaust leak	Seal exhaust leak	Exhaust leak: $100-$200 (if welded to repair)
#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	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

GMC C1500 Suburban CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

	DTC Codes	Most Common Causes	Repair	Repair Cost
#1	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
#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	P0430	Damaged or worn out catalytic converter	Replace catalytic converter	Replace catalytic converter: $400-$2400
		Broken O2 sensor	Replace downstream O2 sensor	Replace catalytic converter: $400-$2400
		Exhaust leak	Seal exhaust leak	Exhaust leak: $100-$200 (if welded to repair)

GMC Canyon 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	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
#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	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

GMC Envoy – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

For more details visit our GMC Envoy 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	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	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

GMC Envoy XL – 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	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
#3	P0128	Faulty engine coolant thermostat	Replace engine coolant thermostat	Replace engine coolant thermostat: $40 – $190
#4	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
#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)

GMC Envoy XUV – 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	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	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	P0128	Faulty engine coolant thermostat	Replace engine coolant thermostat	Replace engine coolant thermostat: $40 – $190

GMC Jimmy – 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	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

GMC K1500 – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

	DTC Codes	Most Common Causes	Repair	Repair Cost
#1	P0140	Faulty oxygen sensor	Replace oxygen sensor	Oxygen sensor: $200 – $300
#1	P0140	Faulty mass airflow sensor	Replace mass airflow sensor	Mass airflow sensor: $230 – $330
#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

GMC Safari – 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	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

GMC Savana 1500 – 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	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
#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	P0430	Damaged or worn out catalytic converter	Replace catalytic converter	Replace catalytic converter: $400-$2400
		Broken O2 sensor	Replace downstream O2 sensor	Replace catalytic converter: $400-$2400
		Exhaust leak	Seal exhaust leak	Exhaust leak: $100-$200 (if welded to repair)
#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)

GMC Savana 2500 – 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	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	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	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	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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $200

GMC Savana 3500 – 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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $200
#4	P0102	Faulty mass airflow sensor	Replace mass airflow sensor	Mass airflow sensor: $230 – $330
#4	P0102	Faulty air filter	Replace air filter	Air filter: $50 – $70
#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

GMC Sierra 1500 – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

For more details visit our GMC Sierra 1500 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	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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $200
#5	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

GMC Sierra 1500 Classic – 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	P0463	Fuel level sensor is broken	Replace fuel level sensor	Fuel level sensor: $864 – $1,023
		Fuel pump is broken	replace fuel pump	Fuel pump: $806 – $967
		Faulty gauge cluster	replace gauge cluster	Instrument cluster: $804 – $824
#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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $200
#4	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
#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

GMC Sierra 1500 HD – 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	Replace temperature sensor	Temperature sensor: $392 – $427
#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	Replace mass airflow sensor 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

GMC Sierra 2500 – 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	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	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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $200

GMC Sierra 2500 HD – 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	P0678	Glow plug failure	Replace glow plug	Glow plug: $230 – $290

GMC Sierra 2500 HD Classic – 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	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	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	Replace mass airflow sensor Seal vacuum leak	Vacuum leak $100 – $200

GMC Sierra 3500 – 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	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	P0678	Glow plug failure	Replace glow plug	Glow plug: $230 – $290

GMC Sierra 3500 HD CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

	DTC Codes	Most Common Causes	Repair	Repair Cost
#1	P2463	Faulty Diesel Particulate Filter	Replace Diesel Particulate Filter	Diesel Particulate Filter Replacement: $2500 – $8000
#1	P2463		Clean Diesel Particulate Filter	Cleaning Diesel Particulate Filter: $150 – $200
#2	P0128	Faulty engine coolant thermostat	Replace engine coolant thermostat	Replace engine coolant thermostat: $40 – $190

GMC Sonoma – 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	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
#3	P0401	Faulty EGR valve	Replace EGR valve	EGR valve: $332 to $413
#3	P0401	Engine vacuum leak	Fix vacuum leak	Vacuum leak: $90 to $125
#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	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

GMC Terrain – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

For more details visit our GMC Terrain 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	P0013	Faulty camshaft sensor	Replace camshaft sensor	Camshaft sensor: $200 – $400
#2	P0013	Faulty oil control valve	Replace oil control valve	Oil control valve: $300 – $600
#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	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	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

GMC Yukon – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

For more details visit our GMC Yukon 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	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	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	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

GMC Yukon XL – 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	Replace catalytic converter: $400-$2400
		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	Fuel injectors: $1500-$1900
#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	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

GMC Yukon XL 1500 – 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	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
#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
#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

FAQs – GMC 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 make 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 make 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 GMC 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.

FIXD Research Team

At FIXD, our mission is to make car ownership as simple, easy, and affordable as possible. Our research team utilizes the latest automotive data and insights to create tools and resources that help drivers get peace of mind and save money over the life of their car.

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