P2401
EVAP Leak Detection Pump Control Circuit Low
Drive voltage on the leak-detection pump line is below the lower limit. Often a short to ground in the harness.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Drive line shorted to groundCommon
- Pump internal shortPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- EVAP Leak Detection Pump
- EVAP Pump Wiring
P2401 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.