P1336 – EVAP Vent Valve Stuck Closed
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Symptoms
- Fuel tank pressure issues
- Hissing at cap
- Check engine light
Causes
- Stuck valve
- Debris in valve
- ECU control fault
Diagnosis
- Command vent valve
- Inspect for blockage
- Read tank pressure
Repair
- Replace vent valve
- Clean debris
- Update ECU if needed