OBD-II TROUBLE CODE GUIDE
P0456: EVAP System Leak Detected — Very Small Leak
The fuel-vapor system has detected a very small loss of sealing integrity.
What P0456 means
The fuel-vapor system has detected a very small loss of sealing integrity.
Common possible causes
- Fuel-cap seal
- Fine hose leak
- Slightly leaking valve, canister, or filler-neck seal
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.
Look up P0456 for my vehicle