P2402 code meaning
EVAP System Leak Detection Pump Control Circuit High
Powertrain system Generic code P24xx codes Check engine light
What P2402 means
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.
P2402 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P2402
- Check engine light that may persist after repair until software is updated
- EVAP readiness incomplete, inspection may fail
Common causes of P2402
- Most likelyLeak detection pump motor seized or drawing excessive current
- PossibleControl wire shorted to a battery-voltage feed
- Less likelyControl module software that does not clear the fault after repair (Acura TLX Type S recall)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP leak detection pumpEVAP pump wiring
What each part of P2402 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 02 | The exact fault in that area. |
What to do next
- Note P2402 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2402
What does P2402 mean?
P2402 means "EVAP System Leak Detection Pump Control Circuit High". P2402 points to the opposite fault of P2401: the pump control line sits at supply voltage or the pump draws too much current. It is a generic code, so it means the same on every make.
Is it safe to drive with P2402?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2402 fail an emissions test?
Yes, it can. P2402 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2402 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2402 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.