P0C05
KrytycznyCode P0C05 indicates damage to the U-V-W phase circuit of traction motor 'A' (open circuit) in hybrid and electric vehicles.
Code P0C05 indicates a problem with the phase circuit of traction motor 'A' in a hybrid or electric car. It usually manifests as loss of power and illumination of the engine light. It can be caused by a broken wire, damaged connector, or a more serious fault in the inverter or motor – therefore it requires thorough diagnosis by a high-voltage system specialist.
Symptoms
Check Engine light illumination, loss of drive power, limited maximum speed (fail-safe mode), unstable electric motor operation, no response to accelerator pedal, possible complete immobilization of the vehicle.
Possible causes
- Open circuit or short circuit in the U, V, or W phase wires of the traction motor - Damaged connectors or corrosion in the motor harness - Faulty traction motor (inter-turn short circuit, open winding) - Inverter (power module) fault controlling the motor - Damage to the rotor position sensor or current transducer
Affected systems
Sources and further reading
Does code P0C05 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.