Powertrain, generic · Hybrid propulsion

P0C10 Drive Motor B Inverter Power Supply Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C10 flags a supply of the motor B inverter that is above its permitted range. Its siblings are P0C0E for a lost or open supply and P0C0F for a low one; P0C0D is the motor A version. No manufacturer documents P0C10 publicly. GM uses only the open-circuit code P0C0E for this supply and describes it as the power feed of the gate-drive board, monitored through the status line of the IGBT module. An overvoltage on that rail can damage the driver circuits, so the controller shuts the inverter down. CARB requires hybrid components to be checked for circuit faults. Expect a warning lamp and loss of the electric drive provided by motor B.

Likely causes

Faulty voltage regulation of the gate-drive supply inside the motor B inverter
Excessive 12 V system voltage from the DC/DC converter or an external charger
Supply or sense line shorted to a higher voltage in the harness

Symptoms

  • Malfunction indicator lamp, hybrid system warning
  • Reduced propulsion, motor B unavailable
  • Vehicle limited to engine or reduced-power operation

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–5,000
Time0.5–6 h

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

Parts involved

drive motor b inverterwiring harnesshybrid control module

Related codes

P0C0EP0C0FP0C0DP0A79

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