What does code P0C09 mean?

Q: What does code P0C09 mean?

Drive Motor B Phase U-V-W Circuit Low. P0C09 indicates that the inverter or motor control module has detected an abnormally low voltage or current on the phase U, V, or W circuit of drive motor B, which is the second traction motor in a hybrid or electric vehicle. The computer compares commanded output with actual feedback and flags the circuit as low when the signal falls outside the expected range, often pointing to a wiring, connector, or motor winding problem rather than a failed motor itself.

DTC codes / P0Cxx · Hybrid propulsion / P0C09

P0C09Drive Motor B Phase U-V-W Circuit Low

P0C09 indicates that the inverter or motor control module has detected an abnormally low voltage or current on the phase U, V, or W circuit of drive motor B, which is the second traction motor in a hybrid or electric vehicle. The computer compares commanded output with actual feedback and flags the circuit as low when the signal falls outside the expected range, often pointing to a wiring, connector, or motor winding problem rather than a failed motor itself.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.