TorqueMech OBD Code Guide
P0442 - Evaporative Emission Control System Leak Detected (Small Leak)
Small EVAP leak detected.
Severity
Low
Drivability
Usually no noticeable symptoms
Typical Cost
$20 - $350+
Code Meaning
Small EVAP leak detected.
What You May Notice
- Check engine light with little or no drivability change
- Fuel smell around the vehicle after parking or refueling
- EVAP monitor not ready for emissions testing
Common Causes
Loose gas cap
Small hose crack
Canister vent valve leakage
Quick Checks
- Inspect/replace gas cap seal
- Smoke test for small leaks
- Inspect EVAP lines near tank/canister
EVAP Purge / Vent Checks
- Verify gas cap seal and filler neck condition first
- Smoke test lines from canister to engine bay
- Command purge and vent valves with a scan tool if available
- Inspect vent valve wiring and connectors for corrosion or damage
Likely Repairs
Use test results to confirm the fault before pricing the repair.
EVAP small leak diagnosis
Estimator-ready next step for a confirmed repair path.
EVAP leak smoke test
Estimator-ready next step for a confirmed repair path.
Gas cap replacement
Estimator-ready next step for a confirmed repair path.
EVAP purge valve replacement
Estimator-ready next step for a confirmed repair path.
Next Steps
Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.