How to Troubleshoot and Fix the P0457 Jeep DTC Code?

Unlike other diagnostic codes, diagnostic trouble code P0457 can be concerning for your Jeep and the environment as well. It indicates a leak in the EVAP system. 

The better it is for your Jeep, the faster you can identify the issues and address them. No worries! In today’s article, we’ll help you find the reason and get rid of this P0457 code. 

What Does the P0457 Jeep Code Mean?

When you discover the code with the help of the OBD-II scanner, you will see it says “EVAP system- Leak Detected.” What does this mean? 

Well, the powertrain control module of your Jeep usually stores this code if there is any leakage in the evaporative emission control system. 

It also indicates the fuel vapor can’t reach the engine from the fuel tank due to leakage.

As leakage in the evaporative emission control system is bad for the atmosphere and your Jeep, the computer in your Jeep considers this situation alarming and throws the code. Now, let’s break down the code here. 

• P = Powertrain Control Module.
• 0 = A generic manufacturer-specific code derived from the SAE standard.
• 4 = Additional systems for emission reduction ( EVAP Issue )
• 57 = Specific fault code 00-99 (Here, the numbers indicate leakage in the emission control system in your Jeep)

What Causes ‘EVAP System- Leak Detected’ on Jeep?

You have already come to know that the code P0457 simply means there is leakage in the evaporative emission system.

And there are possibly many causes that can set the stage for fuel vapor to come out and get mixed with the atmosphere. 

The evaporative emission control system comes with many components. And when it comes to troubleshooting the code P0457, it makes sense to check the related parts to eliminate the code. Now let’s look at the possible causes.

1. Faulty fuel filter cap.
2. Damaged EVAP system hoses.
3. Defective purge valve.
4. Faulty fuel vapor canister.
5. Leakage in the fuel tank.
6. Faulty fuel filter neck.

And we believe checking these issues one by one will be bare enough if you want the frustrating code P0457 to go away.

Read Also: How to Troubleshoot & Fix P0394 Jeep Wrangler DTC Code? Comprehensive Explanation!

How to Troubleshoot & Fix P0457 Jeep Code?

Now you know what components in the evaporative emission system can malfunction and cause the code. So, we will proceed with our troubleshooting process based on the above causes. 

Additionally, we will progress from basic to advanced troubleshooting to prevent you from replacing more expensive parts before first making sure that resolving the minor issue will work. 

1. Check and Replace the Faulty Fuel Filter Cap

The role of the fuel filter cap is to hold the fuel filter in the right place securely. That’s why putting the fuel cap correctly on the fuel filter is recommended. Another critical role a fuel filter cap plays is to help regulate the fuel pressure within the fuel system.

Now if the fuel filter cap on your Jeep becomes loose or damaged, it makes all the sense in the world that you will face the EVAP leakage issue. 

As the fuel cap contributes to regulating fuel pressure, too much pressure can cause EVAP leakage, and you discover the code P0457 when using the scan tool.

Here, the solution is first to check whether the fuel filter cap located on the fuel filter is loosened. If you find the cap loose, you should tighten it. 

Besides, if the fuel filter cap is damaged, you should replace it with a new one if you do not want to see the fuel vapor escaping from the EVAP system. Replacing the fuel filter cap can cost $90-$200.

2. Check and Replace the EVAP System Hoses

You’ll find a few hoses that connect different components in the EVAP system in your Jeep. 

The fuel vapor is supposed to find ways to transfer from the fuel tank to the engine through these hoses. But have you ever wondered what can happen if the hose becomes cranked or damaged? 

Due to this, the fuel vapor will escape from the EVAP system, polluting the atmosphere and creating barriers for the Jeep to function efficiently. 

Usually, with time, the hoses can become extremely corroded (due to natural wear and tear); for this, you can see them in a cranked or damaged condition, which can cause major leakage. 

Additionally, it might happen that something was not good when installing the EVAP hoses.

Therefore, no matter what happens, you should visually inspect the EVAP hoses first. 

Then, if you find any additional signs of damage or crank that results in leakage, it will be better to replace the hose when dealing with EVAP system leakage issues. 

Besides, we recommend you not feel shy about going with a professional mechanic in such a case.

Read Also: How to Troubleshoot & Fix P0507 Jeep Grand Cherokee Code?

3. Check and Replace the Defective Purge Valve

Let’s say you can not find any issues regarding the EVAP system hoses and the fuel cap. 

So, the next thing you should check is the purge valve which plays a prominent role in the functioning of the evaporative emission system. 

The purge valve in your Jeep controls the flow of the fuel vapor from the fuel tank to the engine. 

Now, if the purge valve becomes defective or deficient, the flow of the fuel vapor is not supposed to be appropriate. 

And in such a case, the faulty purge valve can cause a vacuum leakage in the EVAP system. 

And when you attempt to discover the DTC code, the p0457 code takes place. The fuel vapor will escape from the fuel tank of your Jeep. 

The simple solution, in this case, is to check the purge valve of the EVAP system correctly. 

This might seem tricky to you if you don’t have advanced knowledge about your Jeep’s components. If the purge valve turns out faulty, you need to replace it without a second thought. 

4. Check and Replace the Faulty Fuel Vapor Canister

Extreme chances are if the fuel vapor canister becomes faulty in your Jeep, the issue of the EVAP system can take place. 

Now ask us why? Well, the leading role of a fuel vapor canister is to prevent the fuel vapor from being released into the atmosphere. 

So, it makes sense that if the fuel vapor canister becomes faulty or broken, the fuel vapor can escape from the evaporative emission system in your Jeep.

What exactly happens here is if the fuel vapor canister falls, it can’t absorb the fuel vapor which comes from the fuel tank. 

And this indicates the EVAP system leakage; at least your Jeep’s computer thinks so. In most cases, there might be physical damage to the fuel vapor canister.

So, you should first check the fuel vapor canister. If you find it defective after a careful inspection, you need to replace it. 

Then again, we want you to go with the mechanic if you don’t have the tool to check the fuel vapor canister.

Read Also: How to Troubleshoot and Fix U1120 Jeep DTC Code?

5. Faulty Fuel Filter Neck

Though we can’t consider the fuel filter neck as one of the core components of the EVAP system, chances are there that due to the issue of a bad or faulty fuel filter neck, you can discover the p0457 Jeep code. 

This is because if there is a problem with the fuel filter neck, which plays a decent role in connecting the fuel filter with the fuel tank, it can cause the EVAP system leakage. 

Now the question is, what exactly can happen with the fuel filter neck of your Jeep? The extreme chances are the neck becomes physically damaged or cranked. 

And if this happens, it can’t connect the fuel filter to the fuel tank in your Jeep. The fuel vapor can easily escape from the fuel tank and get mixed into the atmosphere.

You need to check the fuel filter neck carefully. If it seems physically broken, replace the fuel filter neck with a new one. It might cost you around $150-$200. 

6. Check the Leakage in the Fuel Tank and Repair/ Replace It

You can’t allow leakage in the fuel tank in your Jeep. All the results of fuel pump leakage, from poor mileage to sudden Jeep stops. 

And as you are dealing with the p0457 Jeep code, you also need to check the fuel pump leakage. 

This is because leakage in the fuel pump, as the fuel vapor emitted from it, is also considered EVAP or evaporative emission control system leakage. 

If there is leakage in the fuel tank, the fuel vapor is not supposed to direct to the correct location where it is supposed to be, meaning in the engine of your Jeep, no matter what model you own. 

Instead, the fuel vapor can get in touch with the atmosphere and cause health hazards due to air pollution. 

In most cases, the fuel pump becomes leakage due to extreme physical damage or corrosion. So, what you need to do is to check the fuel pump in your Jeep carefully. 

And unfortunately, if you find any sign of leakage, it’s time to replace the fuel pump. 

But before that, it is better to inspect the fuel pump checked by a mechanic carefully. Replacement cost? Anything between $1000-$1200.

Read Also: How to Troubleshoot and Fix the P1491 Jeep DTC Code?

Frequently Asked Questions

There is a huge number of Jeep owners worldwide. And so, a group of people often share their queries regarding the code p0457. We plan to answer some of them here.

Final Thoughts

There is no scope to take the troubleshooting p0457 Jeep code so lightly. Instead, whenever you see the check engine light on and explore the code, you should start taking necessary measures to get out of the code. 

If you have the necessary knowledge and equipment, you can try it yourself; otherwise, let a professional handle it.

Read Also: How to Troubleshoot & Fix P0132 Jeep DTC Code? (Ultimate Guide)