EVAP System Leak Detection Pump Performance/Stuck Off
The EVAP leak detection pump does not start when commanded. Motor seized, relay failure, or driver fault.
Affected components
- Evap leak detection pump
- Wiring harness
- Ecm
Common causes
- High likelihood: Pump motor seized
- Medium likelihood: Pump relay failed
- 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
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.