Powertrain, generic (extended)

P2E4A Battery Charger Coupler Temperature Sensor C Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E4A is the general electrical fault of a third temperature measuring point in the charging inlet, logged when the module sees a defective circuit but does not sort it into low, high or implausible. Unlike sensors A and B, the C row has no intermittent code of its own. Why a third sensor exists: a TE Connectivity patent (US11329436) recalls that above 200 A each DC contact needs its own permanent temperature watch, and inlets such as Sailtran's CCS2 add one at the L1 pin. Which contact C watches is up to the maker, and none documents P2E4A publicly. A Phoenix Contact patent (US10256579) shows that one sensor input may even be a series chain of PTC elements on several pins, so one broken lead silences the whole chain. CARB expects charger faults that block or slow plug-in hybrid charging to be detected.

Likely causes

Sensor lead or crimp between inlet and evaluating module broken
Low-voltage connector of the inlet harness loose or corroded
Temperature element C (or one element of a PTC chain) failed inside the inlet
Measuring input in the charger or charge control module defective

Symptoms

  • Charging refused or only possible at reduced power
  • Charging system warning in the cluster or the app
  • Charge indicator at the inlet signals a fault

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

P2E4BP2E4CP2E4DP2E4EP2E4FP0D99

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