Powertrain, generic (extended)

P2E51 Battery Charger Coupler Temperature Sensor D Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E51 reports a sensor D voltage below the valid band. TE Connectivity lists thermistors, thermocouples and resistance temperature detectors as candidate elements for inlet sensing (US10960781), and the patent also explains the stakes: contact resistance heats the inlet at high current and could melt parts or start a fire if nobody watches. With an NTC thermistor a low signal suggests a contact far too hot to be real; with a resistance detector such as a PT1000 it suggests a pin colder than the climate allows. Either way the most common physical cause is a short to ground or moisture across the sensor leads. The only public trace of a sensor D is Ford's SSM 55080 on P2E53 for three of its electric models; P2E51 itself appears in no maker's published documents. High signal is P2E52, real overheating P2E53.

Likely causes

Sensor D signal wire shorted to ground
Moisture or corrosion in the inlet harness connector
Temperature element D shorted internally
Measuring input of the evaluating module defective

Symptoms

  • DC fast charging refused
  • Charging warning message
  • Inlet temperature reading implausible in live data

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

P2E4FP2E50P2E52P2E53P2E4CP0EE9

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