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Dodge Challenger P0457: EVAP System – Leak Detected


P0457 It is a somewhat common fault code with the Dodge Challenger. This code refers to a number you are given when you connect your Challenger to an OBDII Scanner. P0457 Indicates that there is a leak in the Evaporative Emissions Control System (EVAP). It is similar to P0455 (large leak) and P0456 (small leak)

Dodge Challenger Diagnostics P0457

P0457 is usually not an immediate threat to the drivability of your Challenger. However, whenever your check engine light comes on, it’s good to get it taken care of as soon as possible.

Dodge Challenger P0457 Definition

P0457 is a universal OBDII fault code. This means that regardless of the make or model of the vehicle, the code will mean the same thing (Challenger or not). The code technically means:

System Leak: Evaporative Emissions System

The EVAP system captures all the fuel vapor from the tank and sends it to the engine intake to ignite in the normal combustion process. When there is a leak in the EVAP system of the Dodge Challenger, it will throw the OBDII Code P0457.

Dodge Challenger P0457 OBDII Code Symptoms

P0457 Dodge Challenger

The P0457 code is usually not accompanied by any noticeable symptoms, other than the gas smell and the prompt engine service light.

You should especially notice the smell of fuel around the fuel tank or fuel filler tube area.

The EVAP system deals directly with fuel vapors. If these vapors leak into the system, you will often faintly smell them while driving the vehicle. But it will not affect the operation of the engine itself. The EVAP system deals with fuel vapors, not the operation of your Challenger’s engine.

Causes of Challenger Error Code P0457

There are many things that can cause the P0457 fault code to activate on your Dodge Challenger. If your Challenger has warned you in recent months that the gas cap was off when it wasn’t, then replacing it would be a great first step.

Here are the most common problems that throw code, presented in (somewhat) order from most to least likely:

  • Evap system hose– The hose that carries fuel vapor from the fuel tank to the intake manifold may begin to leak. This will cause code P0457. Look for a tear or hole in it. This is one of the most common problems causing code.
  • Steam tank purge valve– One of the most common causes of the P0457 code is the steam tank purge valve. It is very easy to replace. There are a few clips that you have to find and remove.
  • fuel tank sending unit– It is possible that the gasket that joins the fuel-sending unit to the fuel tank is damaged. This can reduce the reservoir pressure and release the code.
  • fuel cap– A bad fuel cap can cause the code to be thrown for sure. Often, you will receive a message that the fuel cap is off even though it is on. If you get that message, in addition to a P0457, it can save you a lot of time and money by replacing the gas cap and seeing if it goes away.
  • fuel filler neck– There is often a gasket where the fuel filler neck connects to the gas tank. This gasket can dry out, especially on vehicles that spend their time in dry climates. When it dries out, the fuel tank can no longer maintain pressure.

P0457 Diagnostic – Dodge Challenger

A mechanic has a wide range of instruments at his disposal to diagnose the cause of P0457 in your Dodge Challenger. Here are the most common things done to diagnose the code:

  • The mechanic usually checks for other fault codes. The more fault codes there are, the easier it can be to diagnose a problem. This is because when they appear together in certain combinations, there will often only be a few conditions that return any code combination at a time.
  • After finding out what fault codes appear with P0457, the mechanic usually inspects the EVAP system. This includes the purge valve, line, and reservoir.
  • The mechanic will inspect the gas cap to make sure it can withstand the pressure. If you receive a warning that your gas cap is off, even when it is on, replacing it will more than likely clear this code.
  • The fuel tank pressure will be checked and controlled.
  • After the aforementioned checks and arrangements, the mechanic will perform two tests:
  • A smoke test, and will use a scan tool to confirm that the EVAP solenoids and valves are working properly.

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

Most common fixes for P0457

Here are the most common Challenger P0457 fixes:

  • Replacing the gas cap
  • EVAP duct replacement
  • Replacing the charcoal canister
  • Replace the fuel tank

Of all the items listed above, it would be wise to start with the gas cap and work your way to the fuel tank, as the gas cap is by far the easiest and least expensive item to replace here.

Here is a great video on how to check the gas cap.

Good luck figuring out what’s causing your Dodge Challenger to throw code P0457. We hope this helps you. If there is anything you think you could add, feel free to leave a comment below.

Is P0457 a serious problem?

Although P0457 is not going to cause the Challenger’s engine to stop running, it should not be treated lightly. You could have a fuel leak. Pay close attention to the tank level and make sure there are no fuel leaks. We recommend that you take it in and/or take care of it immediately.

If you think there is anything you can add to this article, please leave a comment below. Thank you!


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