P0442 — Evaporative Emission System Leak Detected (Small Leak)
Reviewed1 source
1 source
- Official data (NHTSA)official_feed
What P0442 means
Safe to drive short-term
The ECU detected a small leak in the EVAP (fuel vapor recovery) system — most often a loosely sealed fuel filler cap.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Cracked EVAP system hose
- Cracked or disconnected EVAP hose
- Faulty purge or vent valve
- Loose or worn fuel cap
- Loose or faulty fuel cap
Symptoms
- Occasional fuel odor
- Check-engine light with no drivability change
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