Severity: Low
Safe to drive. Schedule a diagnosis soon.
What P0442 means
The evaporative emissions system failed its leak test with a small leak, roughly the size of a 0.040" hole. It does not affect how the vehicle drives.
Symptoms
- None other than the check engine light
- Occasional fuel smell
Common causes
Most likely first
- 1Fuel cap seal worn or not tightened
- 2Cracked EVAP hose
- 3Purge or vent valve not sealing
- 4Leaking fuel filler neck
How we diagnose it
- Inspect and test the fuel cap
- Smoke test the EVAP system
- Command purge and vent valves and check they seal
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.