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.

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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How to fix code P0455 evap large leak fix? ›

Repair Solutions

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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Is it okay to drive with a P0455 code? ›

Unless you see there are fuel leaks or the fuel odor gets really strong, you can keep driving. But unless you find a P0455 code fix, a large leak in the EVAP system can cause major fuel economy issues.

How to fix incorrect purge flow? ›

Replacing the gas cap and purge valve are two of the most common fixes for this error code. However, there could be other issues that trigger this code, like disconnected or damaged wires within your EVAP system.

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.

Will a gas cap code clear itself? ›

On most vehicles, the cap will “click” into place when it's secure. After you've tightened down the gas cap, use a scan tool or code reader to clear the EVAP-related codes from the PCM's memory. The codes will not go away immediately on their own—you must use a tool to clear them.

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How do you fix P0455 code? ›

Shopping for Fuel System Repairs

If your vehicle logs a P0455 code, then it's time to consult a mechanic and replace faulty fuel system components as advised. Whether you need a new gas cap or a fuel tank pressure sensor, CarParts.com can make shopping for replacement parts quick and hassle-free.

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How do you get rid of a small 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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How do you seal an EVAP leak? ›

If there is a leak, remove and reinstall the gas cap and retest. If the leak goes away, you've found the problem. If it doesn't, remove the gas cap again. Switch to the smoke hose and fill the system with smoke until it exits the filler neck.

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How do you clear the EVAP code? ›

The code will not clear itself however after it is repaired the check engine or service engine soon light should go out. The only way to clear the code from the memory is with a scan tool or sometimes disconnecting the battery. What does the EVAP canister do? It captures evaporative emissions from the fuel tank.

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Will an evap code clear itself? ›

Even in cars that automatically clear the P0455 code, don't expect the code to be cleared right away. The EVAP system checks for leaks while you drive your car for some time, so you'll probably need to drive for a while before the check engine light turns off and the code is cleared.