EVAP System Vent Valve Control Circuit Low
The vent valve closes the EVAP canister to atmosphere during leak tests. The control line for that valve is shorted to ground - the ECU drives the valve and measures voltage below the expected level, indicating either a harness short or an internal solenoid short.
Affected components
- Evap vent valve
- Evap vent wiring
Common causes
- High likelihood: Control line shorted to ground
- Medium likelihood: Vent solenoid internally shorted
- Low likelihood: Connector pins corroded - high contact resistance
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
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.