Powertrain, generic · Hybrid propulsion

P0C0F Drive Motor B Inverter Power Supply Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C0F means the supply of the motor B inverter is present but below its permitted range. P0C0E covers a lost or open supply, P0C10 a supply that is too high, and P0C0C is the same fault on motor A. No manufacturer documents P0C0F publicly. GM's tables for P0C0E name the supply in question: the power feed of the gate-drive board, checked phase by phase with run/crank voltage between 9.5 and 18 V on the 2012 trucks. A sagging rail can no longer switch the power transistors fully, so the inverter protects itself. CARB requires circuit monitoring of hybrid components. The driver typically sees a warning and loses the electric drive of motor B.

Likely causes

Weak 12 V battery or DC/DC converter output feeding the inverter electronics
Corroded connector or poor ground raising resistance in the inverter supply
Failing internal gate-drive power supply in the motor B inverter

Symptoms

  • Malfunction indicator lamp, hybrid system warning
  • Reduced propulsion, motor B unavailable
  • Fault appears mainly with low 12 V voltage, e.g. after standing

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–5,000
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

P0C0EP0C10P0C0CP0A79

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