Powertrain, generic

P0E65 Battery Charger Control Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0E65 flags a fault on the wired command line through which the hybrid control unit operates the on-board charger, most often an interrupted line. GM uses it codegenau: in the 2016 Volt the VICM runs the test, in the 2019 hybrid tables (19OBDG01) the HPC2 module. The check relies on a fault flag raised by the output driver hardware itself and only runs while system voltage is 10.2 V or higher and the charger enable mask is active. Samples are taken every 25 ms; 30 bad ones among 40 store the code. GM classes it Type B, so the MIL comes on once the fault returns on a second trip. Low, high and plausibility faults on the same line have their own codes, P0E66 to P0E68. Plug-in charging is usually refused until the line is repaired.

Likely causes

Broken or disconnected charger control wire
Corroded or pushed-out terminal at charger or control unit
Defective output driver in the commanding control unit

Symptoms

  • Vehicle does not charge when plugged in
  • MIL after the second trip with the fault (GM)
  • Charging fault message in the instrument cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–3 h

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

Parts involved

battery charger control circuitwiring harnesson board charger

Related codes

P0E66P0E67P0E68P0E61

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.