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.

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


You likely won't notice any drivability problems.


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

Related DTC Discussions

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


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