EVAP System Leak Detection Pump Control Circuit/Open
What it means
P2400 means the ECM detected an open in the control circuit for the EVAP leak detection pump — the pump used to test the fuel-vapor system for leaks. It's an electrical fault (open wiring, a failed pump, or a bad connector), not a fuel leak, so the car drives normally. It mainly prevents the EVAP monitor from completing until it's fixed.
Can I keep driving? Yes — this is an emissions-monitoring fault with no effect on how the car drives; just fix it before an emissions test.
Real-world scan data
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 change in how the car drives
- May fail an emissions/readiness check
Common causes
Most likely first
- Open circuit in the leak-detection pump control wiringLikely
- Faulty EVAP leak detection pumpCommon
- Corroded or loose connector at the pumpCommon
- Blown fuse feeding the pump circuitLess often
- ECM driver fault (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see when the fault set.
- Check the leak-detection pump connector and control wiring for an open.
- Verify power and ground to the pump and check related fuses.
- Test the pump solenoid's resistance against spec.
- Replace the leak detection pump if faulty, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2400?+
Can I just clear P2400?+
Related codes
Read & clear P2400 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.