P0455 Evap System Large Leak Detected
Generic: Evaporative Emission Control System Leak Detected (no purge flow
or 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 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.
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
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, and/or
- Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
Sources: B. Longo
See also: P0455.com
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