OBD-II Generic Error Code P2401: How to Fix It

Q: What does error code P2401 mean?

P2401 indicates the EVAP leak detection pump control circuit is low. It means the PCM detects voltage below expected on the pump’s control circuit.

Q: Can I drive with code P2401?

Yes, you can usually drive, but it may cause the check engine light to stay on and could fail an emissions test. It won't affect engine performance immediately.

Q: How much does it cost to fix P2401?

If you DIY, the pump costs $50-$150. A mechanic may charge $150-$300 including labor.

Q: Is the EVAP leak detection pump the same as the purge valve?

No. The leak detection pump tests system integrity, while the purge valve allows fuel vapors into the intake. Both are part of the EVAP system.

Q: Will clearing the code fix P2401 permanently?

Clearing the code only removes the warning. If the underlying issue isn't fixed, the code will return.

Abstract

Error code P2401 indicates a low voltage condition in the control circuit of the evaporative emission (EVAP) leak detection pump. This pump is part of the EVAP system that prevents fuel vapors from escaping into the atmosphere. A low circuit means the powertrain control module (PCM) detects voltage below the expected range, often due to a faulty pump, wiring issue, or blown fuse.