Powertrain, generic (extended)

P2E4B Battery Charger Coupler Temperature Sensor C Circuit Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P2E4B concerns a sensor C value that is electrically valid yet does not fit the situation, for instance a reading that ignores a heavy charge current, departs from the other inlet sensors or jumps without cause. CARB wants such rationality faults kept under their own code, apart from codes for wiring faults and values beyond the limits. TE Connectivity (US11117478) explains why inlet readings can be off: to keep the sensing circuit isolated, sensors often sit away from the power contact, so they lag behind it and read cooler. No manufacturer documents P2E4B. For the A sensor, GM's PIT5904 on the 2022 Hummer EV and BrightDrop EV600 suspects software or oversized, damaged terminals in heavily used station plugs, and says the test reruns only after about 10 minutes of driving above 2 mph. Hard circuit faults belong to P2E4A, P2E4C and P2E4D.

Likely causes

Worn or widened terminals in the charging station plug heating the contact unevenly
Sensor no longer in good thermal contact with its pin
Plausibility logic in the charging software too strict, update available
Temperature element drifted from its characteristic curve

Symptoms

  • Charging stops or starts at reduced power, often at busy public stations
  • Fault does not reappear until the car has been driven for a while
  • Charging warning message

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,500
Time0.3–3 h

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

Parts involved

charge port temperature sensorwiring harnesson board charger

Related codes

P2E4AP2E4CP2E4DP2E4EP2E50P0D9A

References: image-ppubs.uspto.gov, static.nhtsa.gov, law.cornell.edu.