OBD-II TROUBLE CODE GUIDE
P0455: EVAP System Leak Detected — Large Leak
The fuel-vapor system cannot hold pressure because of a large opening or leak.
What P0455 means
The fuel-vapor system cannot hold pressure because of a large opening or leak.
Common possible causes
- Missing or loose fuel cap
- Disconnected EVAP hose
- Stuck valve or damaged charcoal canister
What to check first
Record all stored and pending codes and freeze-frame data before clearing anything. Inspect relevant wiring, connectors, hoses, fluid levels, and obvious damage. Use vehicle-specific service information and test the affected system before purchasing parts.
A code is not a parts order. Several faults can create the same code, and replacing the component named in a code description may not correct the underlying problem.
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