P0457 Dodge - Diagnosing and Fixing the Problem

As you perform a scan of your Dodge as part of your regular maintenance, you notice the P457 code pop up. Though these codes are great for categorizing various vehicle issues, they're not very intuitive. When you notice any kind of diagnostic trouble code, your mind might jump to catastrophic scenarios. Is it time to buy a new Dodge model?

P0457 code highlights

• Level of urgency:Low
• Possible culprits:EVAP system, purge valve, piping, air leaks
• Price for repair:$150 - $600
• If neglected:Harsh engine work, lower efficiency
• DIY repairs:Possible but complicated
• Can you drive?Yes

What does the P0457 Dodge code stand for?

The P0457 Dodge code means Evaporative Emission System Leak Detected (Fuel Cap/Loose Off). When this code appears, your powertrain control module (PCM) has located a major leak in your Evaporative Emission System. As the name suggests, it often happens when the fuel cap loosens or comes off entirely.

Some modern vehicles offer an even more sophisticated diagnosis. Large leaks sometimes happen when you accidentally forget to close the fuel cap. In this case, modern PCMs will display a different warning altogether.

The P0457 Dodge code, therefore, points to a much more serious leak. Still, it's a good idea to double-check your fuel cap before you attempt any repairs.

What does your Dodge need the EVAP system for?

The EVAP system is designed to lower your car's carbon footprint. It achieves this by recycling unburnt exhaust vapors. Normally, these vapors would exit into the atmosphere and contribute to air pollution. The EVAP system draws them back into the intake manifold so they can be burnt completely.

Apart from the environmental benefits, the system also improves your fuel economy a bit. Because EVAP operates on the vacuum principles, the system needs to be airtight at all times. But when a leak occurs in one of its components, the EVAP system loses most of its efficiency.

Are codes P0455 and P0456 related to this issue?

If your Dodge displays the P0455 code, it means the PCM has detected a small leak in the EVAP system. Similarly, the P0456 code indicates a moderate loss of fuel. The P0457 code is the most serious out of all three as it points to large leaks.

We don't recommend driving your Dodge in this condition. First, check whether you closed the fuel cap on your last gas station stop. If yes, you should try out the fixes in the later sections of this article.

Why does the P0457 Dodge Code appear? 5 most common reasons

The P0457 code might appear on your Dodge for several reasons. All of them are related to leaks in the EVAP system. When the PCM detects such a leak, it will inform you about it via this code.

However, this leak can occur in more than just one way. Here are the 5 common reasons your EVAP might be leaking:

• Dislodged gas cap

This is the most common reason why your Dodge might display the P0457 code. If the cap becomes even a bit dislodged, fuel will start leaking out of the EVAP system.

Dodge owners sometimes just forget to seal the cap after refueling. Luckily, this is very easy to fix. Simply tightening the gas cap is often enough to remove the P0457 code.

In the worst-case scenario, the gas cap might crack and fall off completely. In this case, you won't be able to avoid paying your mechanic a visit.

• Presence of dirt or other foreign objects

Accumulated dust and dirt on the cap's threading can break it. You should therefore clean it regularly. Once the cap breaks due to the large heaps of dirt on it, it's often too late to fix this problem. You'll have to get a new cap which isn't cheap. If you wish to avoid the P0457 code, a little bit of maintenance can go a long way.

• Natural wear and tear

Nothing lasts forever and your EVAP system is no exception. The constant exposure to heat and motion will erode the fuel hose eventually. This erosion usually manifests as cracks in the hose, leading to fuel leaks. Unfortunately, you can't do much about this on your own.

• Broken fuel filler neck

This is another vital part of your Dodge's EVAP system. Much like the fuel hose, any cracks in the filler neck will lead to leaks. If this is the case, you'll have to replace it.

• Leaks in other locations

Your Dodge's EVAP system has many other components that might be the cause behind the leaks. Though the P0457 code rarely lights up because of these other components, it's still a possibility. Since they are located deeper in your vehicle, you won't be able to fix them alone.

What are the most common symptoms of the P0457 Dodge code? 4 signs your EVAP is leaking

Though the P0457 Dodge code is hard to fix, it doesn't pose as many problems as other codes. It often manifests itself in the following 4 symptoms:

• The engine light will light up on your dashboard

Your dashboard will inform you about most of your Dodge's issues, including the P0457 code.

• You might smell fuel vapors

Fuel vapors will start escaping from your EVAP system via the leaks. They are quite pungent so you'll certainly notice them.

• The fuel cap indicator lamp will light up

As we mentioned above, an unsealed fuel cap is the most common cause of the P0457 code. When this happens, your fuel cap indicator lamp will light up.

• Reduced gas mileage

Left unchecked, the fuel leaks might take a heavy toll on your fuel economy. Luckily, most Dodge owners notice this issue before it gets out of hand.

Can you drive your Dodge with the P0457 code? How serious is this issue?

Fortunately, the P0457 code is seldom serious. Since it is passive in nature, it doesn't affect your Dodge's drivability. You can use it as you generally would in most cases.

Issues might arise when your Dodge undergoes vehicle emission testing. This type of testing is mandatory in some states and cars with this diagnosis won't pass.

But just because the P0457 code isn't classified as serious, it doesn't mean you can ignore it. These issues will only worsen in time. To avoid even more expensive repairs later down the line, make sure you get your Dodge diagnosis as soon as possible.

How to diagnose and fix the P0457 code on your Dodge?

Though by no means foolproof, this quick guide can help you handle the issue on your own.

Following these x simple steps can help you avoid costly repairs fees:

• Check your factory manual: Although these steps apply to most cars in general, some nuances may vary from model to model. Always consult your vehicle's manual before you attempt any fixes.
• Make sure no other codes are present: If you find multiple codes, the issue might be located somewhere else. Go through each of these codes before you attempt to solve the P0457 issue.
• Check your gas cap: The gas cap is often the main culprit behind the P0457 code. Check whether you have secured it tightly after your last fuel refill. You should also inspect it for any signs of damage. And lastly, clean it dirt that might have accumulated under the threading over time.
• Clear the code with a scan tool. Once you've dealt with the cause, it's time to see if the problem's gone. Use a scan tool to clear the code and try driving your Dodge for a bit. Neither the engine light nor the P0457 code should return.
• Have a closer look at the EVAP system. If the code returns, it's time to check your EVAP system. Look for any signs of damage to the EVAP lines and cracks in the components. If you find any faulty parts, you'll have to replace them.
• Check if the leaks persist. You can follow either one of these two methods. Place a smoke tester into the EVAP's intake manifold junction. If it's leaky, smoke will start escaping through the cracks. You can achieve similar results with a vacuum tester.

What parts might need replacement to fix the P0457 code on your Dodge?

In most cases, the P0457 code appears when your gas cap is faulty. In best-case scenarios, this is just because of a slight displacement. However, sometimes the entire cap might be cracked. If so, you'll have to replace it.

Other parts of the EVAP system include the fuel tank, pressure sensor, charcoal canister, purge valve, vent valve, and a system of hoses and lines. Depending on the location of the issue, you might have to replace either one of these parts.

What's the cost of repairs associated with the P0457 code?

Given the know-how required to make these repairs, you'll likely have to visit an auto repair shop. You might be wondering just how much you'll have to pay for the troubleshooting.

Though the costs depend on your Dodge's specs and the shop's location, expect to pay between 75 to 150 dollars. This is the general hourly rate of most auto repair shops.

Final Thoughts on the P0457 Dodge problem

When the P0457 appears on your Dodge, it means your EVAP system is leaking. These leaks lead to a greater carbon footprint and poorer fuel economy. Apart from scanning, you might also detect this issue by the smell of fuel vapors.

The most common reason why the P0457 code appears is because of a loose gas cap. You most likely forgot to close it after refueling your vehicle. In the worst-case scenario, the entire cap might be damaged. Other parts of the EVAP system might also be faulty and contribute to this issue.

The simplest solution is tightening the gas cap. If the problem persists, you'll have to visit a mechanic. If there is a silver lining to this issue, it's that it's rarely serious and you should still be able to drive your Dodge.