Powertrain, generic · Hybrid propulsion

P0C0D Drive Motor A Inverter Power Supply Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C0D reports that the supply of the motor A inverter is above its permitted range, while P0C0B stands for a lost or open supply and P0C0C for a supply that is too low. No manufacturer documents this code publicly. GM's tables for the sibling P0C0B show what the supply is: the gate-drive rails of the IGBT module, on eAssist a 5 V and a 15 V rail that are each watched against limits. A rail running too high stresses the driver stage and can falsify the switching of the power transistors. CARB requires hybrid components to be monitored for circuit faults. Expect the inverter to shut down or derate, with reduced or no electric drive.

Likely causes

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

Symptoms

  • Malfunction indicator lamp, hybrid system warning
  • Reduced or no electric propulsion from motor A
  • Engine runs more often or the vehicle enters limp mode

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 a inverterwiring harnesshybrid control module

Related codes

P0C0BP0C0CP0C10P0A78P0D2E

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