What Does Code P0457 Mean?
- P0457 definition: Evaporative Emission (EVAP) Control System Leak Detected
- Issue Severity: MODERATE – Extended driving with this code may cause internal engine damage.
- Repair Urgency: Get this code fixed as soon as possible.
- Diagnosis: Although there are no immediate drivability issues of the trouble code P0457, this is the largest vacuum leak of the three (P0455, P0456, P0457). It depends on where the issue is coming from in the EVAP system but this could lead to larger leaks and more issues in the future.
- Common Reason: Code P0457 is often related to a loose gas cap.
The Evaporative Emission (EVAP) Control System is in vehicles to prevent the emissions of fuel vapor (hydrocarbons) into the atmosphere. The EVAP system communicates with the PCM and when there is a vacuum leak in the system, there are one of three codes that can be triggered: P0455, P0456, or P0457 depending on the severity of the leak. When the trouble code P0457 is set, there is a large leak in the EVAP system.
- Loose or damaged gas cap
- Leaking or disconnected EVAP hose
- Faulty purge volume control valve
- Faulty canister vent control valve
- Charcoal canister leak
- Leaking fuel tank
*In many cases there may be no noticeable issues with your vehicle
How Do I Fix Code P0457?
With a P0457 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction related to the EVAP system. Using the live data function of the FIXD sensor and app allows you to read and analyze engine data to properly diagnose a P0457 code.
If the sensors are all reading correctly and you’re not comfortable further diagnosing this issue at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs.
These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.
How Much Does It Cost to Fix Code P0457?
If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0457 code.
Possible Repair Costs for P0457
When it comes to making repairs associated with the P0457 code, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.
- Gas Cap $20-$60
- Evap Purge Volume Control Valve $150-$200
- Charcoal Canister Vent Control Valve $150-$200
- Replacement Evap Line $50-$100
- Charcoal Canister $200-$600
DIY Steps to Diagnose Code P0457
If you’d like to try to fix code P0457 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Complete diagnosis may require some specialized equipment beyond what the FIXD Sensor can provide, but for the most part, this diagnosis and repair can be attempted by beginner DIYers.
DIY difficulty level: Beginner
This repair can be attempted by beginner DIYers.
Tools/parts needed (our top picks from Amazon):
- Basic Hand Tools
STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.
Scan your vehicle to verify P0457 is the only code present. If other codes are present, they must be addressed first.
STEP 2: INPSECT GAS CAP.
Check your gas cap to see if it is loose or damaged. If your gas cap is loose, tighten it and clear the code. Inspect your gas cap for physical damage or deterioration. However, it should be noted that damage to the gas cap or deterioration of its components is not always noticeable. If your gas cap was not loose and you do not see any indications of failure, try replacing the gas cap anyway and clearing the codes. Gas caps are relatively inexpensive and are often the fix for codes related to the EVAP system.
STEP 3: INSPECT EVAP HOSES.
Check all of the EVAP hoses to make sure they are routed properly and aren’t cracked or damaged. This includes the fuel tank and charcoal canister.
STEP 4: CHECK PURGE VOLUME CONTROL VALVE.
Check the purge volume control valve for proper operation. This valve is normally not powered on and when at rest, with no power source applied, does not allow air to pass through. It can get sticky, causing leaks.
The purge volume control valve is usually under the hood near the airbox or intake manifold. To test, remove the hoses from either side of the purge volume control valve with the key and engine off. Blow through openings with no power supplied. If you can’t blow through them, they are sealing properly and are most likely not the cause of this EVAP leak.
STEP 5: PERFORM A SMOKE TEST.
Even with a large EVAP leak, the damage to hoses can be too small to see. If you have completed all of the previous diagnostic steps, a smoke test may be helpful for further diagnosis.
STEP 6: CONSULT A PROFESSIONAL.
If at this point the vehicle is still setting the same code, you may have a more serious problem with the EVAP system, and you should bring the vehicle to a certified shop to have further diagnostic work performed.
Common P0457 Diagnosis Mistakes
Many people fail to follow the full diagnostic test and can underpay or even overpay for their solution. Fuel caps are the easy fix with a run to your local auto repair shop, but people sometimes neglect the possibility of other components it might possibly be which are more costly.
Still Need Help Fixing Code P0457?
If you’ve followed the steps above and are still experiencing issues with the emissions control system and code P0457, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.
- Get Your Code Fixed Fast
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Lifelong automotive enthusiast with a soft spot for offroading. Wrencher turned writer, but I still love to tinker on just about anything with an engine. Dream car: tie between a ‘71 Hemi ‘Cuda and a ’91 GMC Syclone. #GirlDad #SaveTheManuals