Open circuit, or a short to voltage, in the position sensor signal or reference wiring; Corroded, damaged or loose connector at the generator or the inverter/control unit; Faulty generator position sensor (resolver or equivalent); Damaged wiring harness from chafing, heat or previous repair work; Fault in the inverter or motor control unit; Moisture or coolant ingress into the generator or sensor connector.

P0C67

Generator Position Sensor Circuit A High.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
67: FaultThe specific fault in that area

What it means

P0C67 is a generic powertrain code meaning the control unit has seen a signal voltage that is too high on the generator position sensor circuit A. This sensor reports the rotor position of the generator motor, as used in hybrid and electric drive systems, so the controller can time its phase currents correctly. The fault sets when the signal stays above the expected range, which points to a wiring, connector, sensor or control unit problem. Exact circuit layout and thresholds depend on the vehicle and drive system.

Symptoms

Hybrid system or powertrain warning light on
Reduced power or limp mode
Engine will not start, or the hybrid system will not enter ready mode
Engine stalls or cuts out unexpectedly
Rough or jerky operation when the generator and engine are working together
Reduced charging or poor fuel economy

Possible causes

Open circuit, or a short to voltage, in the position sensor signal or reference wiringlikely
Corroded, damaged or loose connector at the generator or the inverter/control unitlikely
Faulty generator position sensor (resolver or equivalent)possible
Damaged wiring harness from chafing, heat or previous repair workpossible
Fault in the inverter or motor control unitrare
Moisture or coolant ingress into the generator or sensor connectorrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting any other hybrid or motor position codes
Check for manufacturer service bulletins and known issues for the specific model and drive system
Visually inspect the generator sensor wiring and connectors for chafing, heat damage, corrosion, water ingress and pushed-out pins
Following the manufacturer's high-voltage safety procedure, and only if trained and qualified, isolate the system before disconnecting any connector or touching any high-voltage component
Check the sensor circuit for continuity, shorts to voltage and shorts to earth against the wiring diagram, with the connector disconnected
Measure the sensor reference and signal values or coil resistances and compare them with the manufacturer's specification
Watch live data of generator rotor position and speed while cranking or running to see whether the signal is stuck or erratic
If wiring and sensor test good, check the inverter or control unit power, earth and connections before suspecting the unit itself

How to fix

Repair or replace damaged wiring and fix any short to voltage or open circuit
Clean, repair or replace corroded or damaged connectors and terminals
Replace the generator position sensor, or the generator assembly if the sensor is not serviced separately
Fix the source of any water or coolant ingress and dry or replace affected components
Repair or replace the inverter or control unit only after confirming a fault, and carry out any required setup procedure
Clear the codes after repair and road test to confirm the fault does not return

Can I keep driving?

High severity

Avoid driving if the car is in limp mode, is running poorly or may stall, as loss of drive can be unsafe. Have it inspected promptly by someone trained to work on hybrid or electric systems.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.