Powertrain, generic · Hybrid propulsion

P0C06 Drive Motor A Phase U-V-W Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0C06 belongs to the phase circuit group of drive motor A and reports that a U, V or W phase line sits too low, typically a short to the negative high-voltage rail or to chassis ground. P0C05 covers an open or missing phase, P0C07 the opposite high state. No manufacturer documents P0C06 for a drive motor publicly; GM's hybrid tables use only P0C05 from this trio. CARB requires hybrid input and output components to be monitored for circuit faults. Such a short usually also trips the inverter's overcurrent protection, so P0C01 or insulation faults may appear alongside. The motor controller shuts down motor A, which leaves the driver with reduced or no electric drive and a warning lamp.

Likely causes

Phase cable or winding shorted to ground or housing
Shorted low-side power switch in the motor A inverter
Insulation damage from heat, moisture or chafing

Symptoms

  • Electric drive shut down with warning lamp
  • Overcurrent or insulation codes stored at the same time

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–6,000
Time1–10 h

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

Parts involved

drive motor a phase uvwdrive motor a inverter

Related codes

P0C05P0C07P0C09P0C01P0BFD

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