P2401
EVAP System Leak Detection Pump Control Circuit Low
Evaporative emissions (EVAP)
Generic OBD-II
Low
What it means
P2401 means the ECM detected low voltage in the control circuit for the EVAP leak-detection pump — the component that pressurizes the fuel-vapor system to test for leaks. It's an electrical fault (usually a short to ground, a bad connector, or a failed pump solenoid) and doesn't affect how the car drives, but it will keep the check-engine light on and fail emissions.
Low
Can I keep driving? Safe to drive — the engine runs normally; this is an emissions fault that will fail an emissions test until repaired.
Common symptoms
What you'll notice
- Check-engine light on
- No noticeable change in how the engine runs
- Fails EVAP monitor / emissions testing
- Possible faint fuel odor if a related leak exists
Common causes
Most likely first
- Short to ground in the leak-detection pump (LDP) control wireLikely
- Corroded or loose connector at the LDPCommon
- Failed leak-detection pump solenoidCommon
- Open or damaged wiring between the ECM and the LDPLess often
- Faulty ECM output driver (rare)Less often
How to diagnose & fix
Work through it in order
- Locate the EVAP leak-detection pump (usually near the charcoal canister) and inspect its connector.
- Check the control wire for a short to ground and the ground circuit for continuity.
- Measure the LDP solenoid resistance and compare to spec; replace if out of range.
- Repair any damaged wiring between the ECM and the pump.
- Clear the code and re-run the EVAP monitor to confirm.
FAQ
Quick answers
Is it safe to drive with P2401?+
Yes. It doesn't affect how the car drives — it's an emissions-system fault. It will, however, keep the check-engine light on and fail an emissions test.
Can I just clear P2401?+
It will return once the EVAP monitor runs again. The wiring or pump fault has to be repaired first.
Related codes
Often seen with P2401
Read & clear P2401 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX