Evaporative Emission Vent Control Circuit Malfunction
A fault in the EVAP vent valve circuit. The vent valve seals the canister against atmosphere during the leak test; without it, the test cannot pull a vacuum and may set false leak codes alongside.
Affected components
- Evap vent valve
- Evap vent valve wiring
Common causes
- High likelihood: Vent valve seized or contaminated by water/dirt
- Medium likelihood: Wiring or connector fault
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.