EVAP System Switching Valve Performance/Stuck
The EVAP switching valve does not respond to commands as expected. The valve is mechanically stuck or unable to switch between purge and vent paths, blocking proper leak diagnosis.
Affected components
- Evap switching valve
- Evap canister
Common causes
- High likelihood: Mechanical failure of valve
- Medium likelihood: Contamination preventing motion
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
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.