P0C03 code meaning
Drive Motor B Current Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0C03 means
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.
P0C03 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C03
- Weak or missing torque from motor B
- Warning lamp for the hybrid or electric drive
- Reduced performance or limp mode
Common causes of P0C03
- PossibleHigh-resistance or loose three-phase connection of motor B
- PossibleInverter power stage for motor B not delivering current
- Less likelyOpen or damaged winding in drive motor B
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor bDrive motor b inverter
What each part of P0C03 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 03 | The exact fault in that area. |
What to do next
- Note P0C03 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0C03
What does P0C03 mean?
P0C03 means "Drive Motor B Current Low". P0C03 indicates that drive motor B draws less current than the controller expects for the requested torque. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C03?
Drive gently and only to a workshop. With P0C03 the car can go into limp mode (reduced power) to protect itself.
Will P0C03 fail an emissions test?
Yes, it can. P0C03 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0C03 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0C03 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.