P0457 OBD-II Trouble Code: Evaporative Emission Control System Leak Detected

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Cost of diagnosing the P0457 code

P0457 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Leak Detected". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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Diagnostic Trouble Code (DTC): P0457

P0457 code definition

When the PCM (powertrain control module) detects a leak in the evaporative emission control system, the P0457 code will be stored and the Check Engine Light will be illuminated.

What the P0457 code means

The evaporative emission system is designed to keep fuel vapor from leaking out into the surrounding air and causing pollution. If there’s a vacuum leak in this system, a P0455, P0456, and/or P0457 code will be detected and stored by the PCM. These codes are very similar, but they differ in how severe the leak is. The P0457 code refers to the most severe emissions leak, while the P0455 code refers to a lesser leak.

What causes the P0457 code?

Because the P0457 code is only stored when there is a large leak, you can rule out a number of smaller problems that might result in a P0455 or a P0456 code. In most cases, a P0457 code is stored due to:

Because this system is protected from the elements, a P0457 code will generally not be caused by weathering or aging of system parts and instruments.

What are the symptoms of the P0457 code?

In general, the vehicle’s performance and drivability will not be affected by a P0457, though in some cases you may notice a decrease in fuel efficiency if the fuel leak is large enough. In most instances, though, the only indicator that the driver or vehicle owner will get will be the illuminated Check Engine Light.

How does a mechanic diagnose the P0457 code?

Because the P0457 code doesn’t generally present any symptoms other than an illuminated Check Engine Light, it’s necessary for a mechanic to use an OBD-II scanner to detect what kind of code is causing the light to turn on. Once the P0457 code is identified, the mechanic will begin a visual inspection, starting with the gas cap.

If the gas cap is missing, worn, cracked, or has some foreign object in the threads preventing it from getting a good seal, the mechanic will replace it, clear the code, and test drive the car to ensure that the code doesn’t get stored again. If the issue is not with the gas cap, the mechanic will move on to inspect the rest of the evaporative emission control system.

Common mistakes when diagnosing the P0457 code

Sometimes this problem occurs simply because the gas cap isn’t tightened properly, which can make the vehicle owner and/or mechanic believe that some component of the evaporative emission control system needs to be replaced.

How serious is the P0457 code?

The P0457 code is the most severe code related to leaks in the evaporative emission control system. It can increase your vehicle’s fuel emissions while decreasing your fuel economy. Depending on the problem, it could lead to even larger fuel leaks later on, which could be more expensive and could cripple your vehicle until you get them resolved.

What repairs can fix the P0457 code?

The most common repair for this code is to either ensure that the gas cap is tightened properly or to replace it. Other repairs include:

Additional comments for consideration regarding the P0457 code

The P0457 code should be fairly simple to address and resolve. It’s important to do a thorough visual inspection, though, as missing a problem with the gas cap could result in replacing perfectly good components of the evaporative emission control system, resulting in a more expensive repair than necessary.

Need help with a P0457 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
leaks
EVAP (Evaporative Emission Control) system
trouble codes

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JOHNNY

33 years of experience
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JOHNNY
33 years of experience
BMW 325Ci - Check Engine Light is on - Sacramento, California
He was great explained everything to me and have now booked him for another appointment. Thanks johnny.

Ronald

41 years of experience
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Ronald
41 years of experience
Mercedes-Benz C300 - Check Engine Light is on - Spring, Texas
Mister Ron was very nice and took time out to explain any concerns I might have about my car. He also made sure he communicated with me when he was on his way, once he was outside, and when we was done working on my car. I appreciate that considering I have a newborn that I had to look after.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Ram 1500 - Check Engine Light is on - Spring, Texas
Extremely satisfied with the service, he was able to come out and diagnose almost immediately. We purchased the parts, he came back installed them and been running great since. Would definitely recommend him and will not hesitate to call again if needed.

Scott

36 years of experience
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Scott
36 years of experience
Dodge Neon - Check Engine Light is on - Tempe, Arizona
I truly enjoy Scott as he has done work for me in the past. Scott is very friendly, knowledgeable, and a true professional! I highly recommend him.


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