P0C03Drive Motor B Current Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0C03 indicates that drive motor B draws less current than the controller expects for the requested torque. It is the low counterpart of P0C04 and the motor B twin of P0C00. No manufacturer documents this exact code publicly, and the GM hybrid tables use only P0C04 and P0C08 for motor B. CARB requires hybrids to monitor electric motor performance. Low current typically comes from a high-resistance cable joint, an interrupted winding path or an inverter stage that does not switch; a single missing phase is reported by GM as P0C08. In practice motor B delivers little or no torque, a warning lamp lights up and the system may fall back to the other motor or the engine.
- What you may notice
- Weak or missing torque from motor B
- Warning lamp for the hybrid or electric drive
- Reduced performance or limp mode
- Likely causes
- PossibleHigh-resistance or loose three-phase connection of motor B
- PossibleInverter power stage for motor B not delivering current
- RareOpen or damaged winding in drive motor B
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.