P2402
EVAP System Leak Detection Pump Control Circuit High
EVAP (emissions)
Generic OBD-II
Low
What it means
P2402 means the ECM sees high voltage (an open or short to power) in the control circuit for the EVAP leak detection pump — the pump the system uses to pressurize and check the fuel-vapor system for leaks. It's an electrical fault, not a running problem, so the car drives normally but can't complete its EVAP leak test and won't pass emissions until the circuit is repaired.
Low
Can I keep driving? Yes — this is an emissions-monitoring fault; the car runs and drives normally but will fail an emissions test until fixed.
Common symptoms
What you'll notice
- Check-engine light on
- No change in how the car drives
- May fail an emissions/smog test
- EVAP leak monitor won't complete
Common causes
Most likely first
- Open or short-to-voltage in the leak detection pump control circuit wiringLikely
- Corroded or loose connector at the leak detection pumpCommon
- Faulty EVAP leak detection pumpCommon
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan and confirm P2402 and check freeze-frame data.
- Inspect the leak detection pump connector and control wiring for an open or short to power.
- Measure the pump's resistance against spec.
- Check the ECM control circuit and grounds.
- Replace the leak detection pump if it fails, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2402?+
Yes. This is an electrical fault in the EVAP leak-detection pump circuit — it doesn't affect how the car runs. It will, however, fail an emissions test and keep the check-engine light on.
Can I just clear P2402?+
It returns once the circuit fault is detected again. Repair the wiring or pump rather than clearing it.
Related codes
Often seen with P2402
Read & clear P2402 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