The trouble code P0457 means “Evaporative Emission System Leak Detected (Fuel Cap Loose/Off.”) The DTC (Diagnostic Trouble Code) P0457 occurs when your powertrain control module (PCM) detects a large leak within the EVAP system.
Your vehicle’s EVAP System (Evaporative Emission System) comprises many critical components, including the following:
When you turn off your vehicle, the powertrain control module shuts the vent valve and canister purge valve, trapping harmful fuel vapor in your engine. On restarting your vehicle, the control module opens the purge valve and charcoal canister, drawing the fuel vapor via the vacuum hose into the intake manifold, to be burned in the engine.
The powertrain control module monitors the EVAP system to ensures no vacuum leak. If the control module detects a large leak, it’ll turn on the Check Engine Light and log trouble code P0457.
Here are the other engine codes related to the Evaporative Emission Control System:
Here are some noticeable symptoms commonly associated with the trouble code P0457:
The key function of the EVAP system is to prevent harmful fuel vapor from escaping into the atmosphere.
If the engine control module detects an EVAP system leak or fault in the EVAP vacuum system, it’ll turn on the Check Engine Light on your dashboard and log error code P0457. However, a lit Engine Light can also signify other trouble codes, so, a full diagnosis is the best way to identify the root cause.
The smell of fuel vapor in your vehicle could signify error code P0457.
In most cases, the fuel vapor smell occurs due to a faulty or loose gas cap. However, it could also occur due to a faulty EVAP canister, EVAP vacuum hose, EVAP pressure sensor, or purge valve.
When the purge valve is faulty, the fuel vapor stored in the EVAP canister escapes into the environment instead of getting burned as fuel inside the combustion chamber.
As a result, your vehicle will consume more fuel than usual, and you’ll notice the fuel level declining rapidly — a common sign associated with DTC P0457.
While trouble code P0457 may not cause any immediate drivability issues, it can severely damage your engine and EVAP system if left unresolved.
P0457 indicates the largest vacuum leak among all the leak-related EVAP codes (P0455, P0456, P0457), and will cause your vehicle to fail the emissions test as required by law.
So, if you notice the Check Engine Light illuminated, you should have your vehicle inspected at a repair shop soon.
Most often, the cause of the trouble code P0457 is a loose gas cap. Here are some other common triggers:
To identify the problem, code P0457 requires a complete diagnosis of the EVAP system.
Here’s an overview of how a skilled technician would diagnose the issue:
Depending on the diagnostic results and vehicle type, there are many potential solutions for the EVAP code P0457.
Here are some common fixes for a problematic Evaporative Emission Control System:
Repair costs
Here are the average estimated costs for fixing the EVAP code P0457, including labor:
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