Powertrain, generic · Hybrid propulsion

P0C0E Drive Motor B Inverter Power Supply Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C0E is the motor B counterpart of P0C0B: the inverter for the second motor has lost the supply of its gate-drive board. GM documents it on the Volt and the two-mode trucks. The IGBT module reports a bias fault through its status line when the supply of phase A, B or C fails. The 2011 Volt checks with high voltage above 100 V, the 2012 trucks with run/crank voltage between 9.5 and 18 V, both after one count, Type A. The 2016 Volt needs 0.002 s of fault in a 0.024 s window, the 2018 table 0.02 s, the 2019 table 0.168 s, always Type A, one trip. P0C0F and P0C10 cover low and high supply. Motor B can no longer be driven, so propulsion is reduced.

Likely causes

Failed gate-drive power supply inside the motor B inverter
Weak 12 V feed, blown fuse or poor ground at the inverter control board
Loose or corroded low-voltage connector at the power inverter module

Symptoms

  • Malfunction indicator lamp after one drive
  • Reduced propulsion message, motor B unavailable
  • Engine runs continuously instead of electric driving

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

P0C0FP0C10P0C0BP0A79

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.