Jeep Wrangler P0457: EVAP System – Leak Detected

P0457 It is quite common to encounter the trouble code Jeep Wrangler. Refers to the number given when you plug in your Wrangler to a OBDII scanner. The P0457 signifies that the Evaporative Emissions Control (EVAPS) system is leaking. This is comparable to P0455 (larger leak) or P0456 (smaller leak).

Your Wrangler's driveability is generally not affected by P0457. Certainly anytime the service engine soon light is on though, it’s good to deal with it as soon as possible.

Jeep Wrangler P0457 Definition

P0457 can be used as an OBDII universal trouble code. It means that no matter what make or model vehicle you have, this code will be the same regardless. The code is technically:

System Leak – Evaporative Emission System

The EVAP system collects fuel vapor from fuel tanks and then sends it to the intake to ignite the engine in normal combustion. When there is a leak in the Jeep Wrangler’s EVAP system, it will throw the P0457 OBDII Code.

Jeep Wrangler P0457 OBDII Code Symptoms

The P0457 code is usually not accompanied with any other symptoms than those listed. Smells like gas The service engine soon light.

The fuel filler tube or around the fuel tank should smell particularly strong.

The EVAP process deals with fuel vapors directly. If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle. But, it won’t affect the way the engine itself runs. The EVAP system is for fuel vapor and does not affect the operation of your Wrangler engine.

Wrangler Trouble Code P0457

P0457 is a trouble code that your Jeep Wrangler can trigger. If your Wrangler has warned you at all in the last few months that the fuel cap was off when it wasn’t, then replacing it would be a great first step.

These are some of the most frequent problems that can throw off the code. They're listed in alphabetical order, from the most likely to the least.

• Hose for Evap System– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This can lead to the code P0457. It should have a tear or a hole. This is the main problem that can cause the code.
• Vapor Canister Purge Valve– One of the most common causes of the P0457 code is the vapor canister purge valve. It’s really easy to replace. You will need to locate and take out a few clips.
• Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. It can lower the tank pressure, which could throw out the code.
• Fuel Cap– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. It may be worth your time to get that message and a P0457 to ensure you don't waste any money.
• Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. It is possible for this gasket to dry, particularly if vehicles spend a lot of time in dry environments. When it dries out, the fuel tank can’t hold pressure anymore.

P0457 Diagnostics- Jeep Wrangler

To diagnose the problem with your Jeep Wrangler's P0457, a mechanic can use a variety of tools. The most commonly used methods to diagnose this code are:

• The mechanic will check to make sure there are no other codes. It is easier to diagnose problems if there are more codes. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
• Once the mechanic has determined the trouble codes associated with P0457, he or she will usually Take a look at the EVAP system. It includes the purge valve and line as well as the canister.
• A mechanic will examine the gas cap and verify that it is able to withstand high pressure. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
• Monitor and check the pressure in your fuel tank.
• The mechanic will then perform the following tests after completing the above-mentioned checks:
• A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.

Here’s a pretty good video on diagnosing these leaks from Scotty Kilmer, if you are interested:

Most common P0457 fixes

These are some of the more common Wrangler-P0457 solutions:

• Replacement of gas cap
• Replacing EVAP lines
• Replace charcoal canister
• Replacing the fuel tank

It is best to begin with the gas cap, and then work your way up to the fuel tanks. The gas cap is the most difficult and cost-effective item to replace.

Here’s a great video on How to check your gas cap.

You will need to find the cause of your Jeep Wrangler throwing the code P0457. This should help. You can add any additional information by leaving a comment.

Are P0457 Serious Concerns?

While P0457 is not going to cause the Wrangler’s engine to stop running, it should not be treated lightly. There could be fuel contamination. You should pay extra attention to the level of your fuel tank and ensure that you're not leaking fuel. It is best to have it checked and/or dealt with immediately.

Feel free to add anything to the article by leaving a comment. Thanks!