P0455 Evaporative Emission Control System Leak Detected (no purge flow or large leak) (2024)

Technical Description

Generic: Evaporative Emission Control System Leak Detected (no purge flowor large leak)
Chrysler: EVAP Large Leak Detected Conditions
Ford: EVAP System Leak (No Purge Flow or Large Leak) Conditions
GM (Chevrolet): EVAP System Leak Detected Conditions
Nissan:Evaporative emission (EVAP) canister purge system - gross leak

What does that mean?

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.

This indicates a fuel vapor leak or lack of purge flow in the EVAP controlsystem. It means a large leak has been detected.

The (EVAP) emission controlsystem prevents the escape of fuel vapors from a vehicle's fuel system. Fuelvapors are routed by hoses to a charcoal canister for storage. Later, when theengine is running a purge control valve opens allowing intake vacuum to siphonthe fuel vapors into the engine.

Symptoms

You likely won't notice any drivability problems.

Causes

A code p0455 most likely means one or more of the following has happened:

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions

With a p0455, the most common repair is to:

Remove and reinstall the gas cap, clear the codes, and drive for a day andsee if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuumnoise or smell fuel), repair if necessary

Sources: B.Longo

Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445 - P0446 - P0447 - P0448 - P0449 - P0452 - P0453 - P0456

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FAQs

P0455 Evaporative Emission Control System Leak Detected (no purge flow or large leak)? ›

Most often, the leak has something to do with the fuel filler cap. It could be missing, not sealed properly, damaged, or not correctly installed. Sometimes, the P0455 code can be set while fueling incorrectly or even by failing to turn off the engine while fueling your vehicle.

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What is the most common cause of a P0455 code? ›

Code P0455 is typically triggered when your vehicle's computer detects a large leak in the EVAP system. Symptoms of a P0455 include a lit check engine light as well as the smell of fuel in your vehicle.

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Can I still drive with a P0455 code? ›

So, yes, it is perfectly safe to drive the vehicle. No worries at all. As for the cause of this code- first and foremost, check the fuel cap. Very commonly, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running can set the light.

How much does it cost to fix a P0455 code? ›

A charcoal canister repair will run $400–$600, depending on where it is located. The cost to replace a filler neck can run from $300–$400. Keep in mind, pricing will vary by location and your vehicle make and model.

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Will P0455 clear itself? ›

In some cars, the P0455 code will clear itself after some time, while other vehicles need to have the code cleared with an OBD II scanner.

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How much does it cost to repair an evap leak? ›

The national cost for an evaporative leak detection pump replacement with CarAdvise in 2024 is between $69 and $463 with an average of $202.

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How to fix incorrect purge flow? ›

How to fix a P0441 OBD-II fault code?

Verify the code with an OBD-II scanner, and reset the fault code. ...
Replace gas cap if defective (common)
Repair any EVAP system leak.
Repair or replace any damaged component in the EVAP system found to be defective.
Replace purge valve if faulty.
Replace vacuum switch if faulty.

More items...

Jan 18, 2022

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How to fix an evap leak? ›

The simplest solution is to remove and reattach the gas cap. Once you do, clear the code on the OBD-II scanner and drive for a few days. If the code does not return, your gas cap probably was the culprit. Of course, there is a chance your gas cap either has worn out or is not compatible with your EVAP system.

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What are the symptoms of an evap leak? ›

It is important to be aware of the warning signs of an EVAP leak so you can take action as soon as possible. The most common warning signs include a noticeable gasoline smell coming from your car, a check engine light appearing on your dashboard, and your car's fuel efficiency dropping noticeably.

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What happens if you don't fix an evap leak? ›

When you don't fix an EVAP problem, the check engine light will stay on, masking other problems that might occur. Of course, if local regulations require passing an emissions test, your vehicle will fail. Finally, harmful emissions are being released into the atmosphere.

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Will EVAP leak code clear itself? ›

Keep in mind: once you've tightened or replaced the gas cap, you'll have to clear the code with a code reader or scan tool afterward. The code won't immediately go away on its own. To be honest, you might have to hire a professional to find a very small leak.

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Can an evap leak cause transmission problems? ›

Common Symptoms of Bad Evap System: Jerky Transmission & Rough Performance.

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What triggers P0455? ›

Sometimes, the P0455 code can be set while fueling incorrectly or even by failing to turn off the engine while fueling your vehicle. Another common cause of this code triggering is leaks. Hoses (like the large one connecting the filler neck to the tank) can crack with time.

How do you clear the code P0455? ›

Check the easiest solution first by tightening or replacing your fuel cap. After you've cleared your error code, code P0455 will return if this wasn't the source of the air leak. Next, replacing a section of hose is the next most common issue.

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Can fuel tank pressure sensor cause P0455? ›

P0455 GROSS LEAK DTC

On a GM, for example, a P0455 can be set by a vent solenoid, fuel tank pressure (FTP) sensor, the charcoal canister, vapor lines, hose connections, filler neck, the fuel tank itself – anything that can cause a leak of more than 20”.

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How do I clear my EVAP code? ›

The easiest solution may be to remove and reaffix the gas cap. Once you do, clear the code on the OBD-II diagnostic scanner and drive for a few days. If the code does not return, your gas cap likely was the culprit.

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Can an EVAP leak be fixed? ›

The scan tool locates leaks that are either hidden or imperceptible to the naked eye. Alternatively, check the functionality of the EVAP purge valve and solenoid. If either of these are defective, replacing the bad part with an OEM component may fix the problem.

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What causes EVAP to go bad? ›

EVAP leaks can occur for a number of reasons. The most common cause is a faulty or worn-out part in the system. This could include the fuel tank, filler cap, fuel lines, or any other part of the system.

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