Powertrain, generic · Hybrid propulsion

P0C5E Drive Motor A Position Sensor Circuit B Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C5E captures brief interruptions or spikes on Circuit B, the second winding of the motor A resolver, that clear again before a firm low, high or plausibility fault can be confirmed. No manufacturer documents this code publicly. GM leaves such events to the debounce of P0C5C and P0C5D, which on its eAssist cars tolerates short outages and only reports a repeating pattern. Where P0C5E is used, the search starts at the mechanical joints of the S2/S4 path: crimp quality, terminal grip, a cable clip that lets the harness rub on the transmission. Checking resistance while flexing the harness tends to reveal it. P0C54 is the same fault on Circuit A; both together point to the common connector.

Likely causes

Loose or weak terminal in the S2/S4 path
Harness rubbing on the transmission because of a missing or broken clip
Moisture entering the resolver plug

Symptoms

  • Warning light appearing only now and then
  • Momentary drop of electric torque
  • No fault found on a stationary check

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,500
Time1–5 h

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

Parts involved

drive motor a position sensor bwiring harnesshybrid control module

Related codes

P0C5AP0C5CP0C5DP0C54P0A43

References: gsi.ext.gm.com, law.cornell.edu, en.wikipedia.org.