EVAP Switching Valve Stuck Open
The EVAP switching valve cannot close. Tank pressure cannot be isolated for the leak detection test, and purge routing may bypass the canister.
Affected components
- Evap switching valve
Common causes
- High likelihood: Valve stuck open mechanically
- Medium likelihood: Drive circuit always energised
- Low likelihood: Carbon or debris buildup preventing free movement
Possible symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.