OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2401?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDrive line shorted to ground
- PossiblePump internal short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Evap Leak Detection Pump, Evap Pump Wiring
Related codes
- P2400EVAP Leak Detection Pump Control Circuit Open
- P23FEBank 1 System B Air-Fuel Ratio Imbalance
- P23FFBank 2 System B Air-Fuel Ratio Imbalance
- P2402EVAP Leak Detection Pump Control Circuit High
- P2403EVAP System Leak Detection Pump Sense Circuit Open
- P2404EVAP Leak Detection Pump Sense Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.