Powertrain, generic (extended)

P2402 EVAP System Leak Detection Pump Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Leak detection pump motor seized or drawing excessive current
Control wire shorted to a battery-voltage feed
Control module software that does not clear the fault after repair (Acura TLX Type S recall)

Symptoms

  • Check engine light that may persist after repair until software is updated
  • EVAP readiness incomplete, inspection may fail

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–550
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

evap leak detection pumpevap pump wiring

Related codes

P2400P2401P2406

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.