P0C56 Possible Causes
- Faulty hybrid vehicle motor
- Hybrid vehicle motor wiring harness is open or short-circuited
- Poor electrical connection in the hybrid vehicle motor circuit
- Faulty HV control ECU
What Does It Mean?
How to Fix Code P0C56
Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0C56 Possible Symptoms
Engine light on (or service engine soon warning light)
P0C56 Meaning
The motor resolver is a type of sensor that detects the position of magnetic poles, essential for ensuring highly efficient control of MG1 and MG2.
The resolver stator contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and rotor changes as the rotor rotates. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the position of the sensor rotor.
The HV control ECU detects the absolute position of the rotor based on the phases of the S and C detection coils and the height of their waveform. Additionally, the CPU calculates the amount of position change within a predetermined time, to use the resolver as a speed sensor.