Powertrain, generic (extended)

P2E4D Battery Charger Coupler Temperature Sensor C Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E4D is stored when the sensor C input rises above its upper limit. In a pull-up circuit that is the signature of an open loop, an unplugged connector or a short to a supply voltage. Read as temperature, it means very cold for an NTC, but very hot for a PT1000 or a PTC element. The Phoenix Contact patent US10256579 describes PTC elements wired in series on several contacts whose resistance climbs steeply once a set temperature is passed; seen from the module, a broken chain looks the same as a tripped one. Charge controllers such as Watt&Well's EVCC accept either PT1000 inputs, measured in a Wheatstone bridge, or NTC inputs on bias resistors, so what high means depends on how the input is configured. No manufacturer documents P2E4D publicly or gives limits. P2E4C is the low-signal sibling; P2E4E is real overheating.

Likely causes

Sensor C loop open, for example a broken wire or unplugged connector
Signal wire shorted to a supply voltage
Temperature element C or one link of a PTC chain open inside the inlet
Measuring input of the evaluating module defective

Symptoms

  • Charging does not start or stops immediately
  • Charging system warning
  • Displayed inlet temperature stuck at an extreme value

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.5–3 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

P2E4AP2E4BP2E4CP2E4EP2E52P0D9C

References: image-ppubs.uspto.gov, wattandwell.com, law.cornell.edu.