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.

Real-world scan data

Seen in

326

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2401 scans

P2402in 87.7% of scans

P043Fin 85.9% of scans

P2419in 84.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2401 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX