P2402EVAP System Leak Detection Pump Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2402 points to the opposite fault of P2401: the pump control line sits at supply voltage or the pump draws too much current. GM's Volt tables call it a short to power detected while the driver is on; when it is active the ECM runs an intrusive check, running the pump for 15 s on command, with a Type B code after 20 failed samples out of 25. In VW's Golf data book of 2014 the limit is a pump current above 3.0 A or, on other engines, the voltage across the pump's current-measuring resistor (about 1.8-4.0 V). Acura recalled 2021-22 TLX Type S models (B22-007) because faulty PGM-FI software could keep the MIL on and P2402 stored after an ELCM circuit repair; Audi and Land Rover also publish P2402 cases. Driving is unaffected, but the evaporative leak check is skipped.
- What you may notice
- Check engine light that may persist after repair until software is updated
- EVAP readiness incomplete, inspection may fail
- Likely causes
- LikelyLeak detection pump motor seized or drawing excessive current
- PossibleControl wire shorted to a battery-voltage feed
- RareControl module software that does not clear the fault after repair (Acura TLX Type S recall)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €550
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.