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

What Does The P0455 Code Mean?

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

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

Related evaporative emission trouble codes include P0450, P0451, P0452, P0453, P0454, P0456, P0457, P0458, and P0459.

What Are The Symptoms Of The P0455 Code?

You likely won’t notice any drivability problems.

What Are The Potential Causes Of The P0455 Code?

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

How Can You Fix The P0455 Code?

With a P0455, the most common repair is to:

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

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

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Gas Cap Seal
>>> EVAP Solenoid
>>> Autel Scanner MaxiCOM MK808S

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Check This Video For Reference

P0455 Infographic - 1 Minute Summary

Reference Sources

Diagnostic Trouble Code (DTC) Charts and Descriptions for P0455 – Page 73.