P0C6C

What it means

P0C6C means the hybrid control unit saw the signal from the generator position sensor (circuit B) sitting higher than its expected range. This sensor, usually a resolver or similar rotor position device, tells the control unit the exact angle of the generator rotor so it can time the current correctly. The exact sensor layout and the meaning of 'circuit B' (for example a second channel or second sensor) depend on the model and hybrid system.

Symptoms

• Hybrid or powertrain warning light on
• Reduced power or limp-home mode
• Engine will not start or will not restart after stopping
• Rough running or poor engine starting on a hybrid system
• Hybrid system messages or ready indicator failing to show
• Poor fuel economy as the hybrid system limits operation

Possible causes

• Damaged, chafed or corroded wiring or connector on the generator position sensor circuit, such as a short to voltage or an open circuit that pulls the signal highlikely
• Faulty generator position sensor (resolver) or its internal windinglikely
• Poor terminal contact or water ingress in the generator or inverter connectorpossible
• Fault inside the inverter or hybrid control unit that processes the position sensor signalpossible
• Incorrect sensor fitment or position after previous generator or transaxle workpossible
• Electrical interference from damaged shielding or earthing on the sensor harnessrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, and note any other hybrid, inverter or motor codes that appear with P0C6C
2. Check for any manufacturer service information or bulletins relating to this code on the specific model and hybrid system
3. Visually inspect the generator position sensor wiring and connectors for chafing, heat damage, corrosion, moisture or bent or pushed-back pins
4. Following the manufacturer's high voltage safety procedure, and only if trained and qualified, isolate the high voltage system before disturbing any hybrid components
5. Check the sensor circuit for short to voltage, open circuit and resistance between terminals against the manufacturer's specification, with the control unit connector disconnected
6. Check the sensor supply, reference and signal wiring for correct values, and look for interference or damaged shielding
7. Check the sensor's own resistance or output against specification, and inspect its mounting and position
8. Clear the code and road test, then recheck live data for the sensor signal and see whether the code returns

How to fix

• Repair or replace damaged wiring, and clean or replace corroded or loose connector terminals, sealing against water ingress
• Replace the generator position sensor or resolver if it is out of specification, and set it up as the manufacturer requires
• Refit or correctly position the sensor if it was disturbed, following the manufacturer's procedure
• Replace or reprogram the inverter or hybrid control unit only after the wiring and sensor are proven good, and only if the manufacturer confirms an unit or software fault
• Restore damaged shielding and earth connections on the sensor harness

Can I keep driving?

Nearby codes

• P0C6BGenericGenerator Position Sensor Circuit B Low
• P0C6DGenericGenerator Position Sensor Circuit B Intermittent/Erratic