OBD-II TROUBLE CODE GUIDE
P0442: EVAP System Leak Detected — Small Leak
The sealed fuel-vapor system is losing pressure through a relatively small leak.
What P0442 means
The sealed fuel-vapor system is losing pressure through a relatively small leak.
Common possible causes
- Loose or damaged fuel cap
- Cracked EVAP hose
- Leaking purge valve, vent valve, or 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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