P0CC0

What it means

P0CC0 is a generic powertrain code meaning the control unit has detected an intermittent fault in the circuit of the drive motor 'A' coolant temperature sensor, found on hybrid and electric vehicles. The signal has briefly dropped out, jumped, or gone out of range and then returned to normal, rather than staying faulty. The module cannot trust the motor temperature reading when this happens, so it may limit power to protect the motor.

Symptoms

• Warning light on, such as the hybrid or EV system warning or malfunction indicator
• Reduced power or the car going into a limp mode at times
• Cooling fan or pump running harder than expected, or erratic
• Temperature gauge or motor temperature display jumping or reading oddly
• Fault appearing and disappearing, often over bumps or when the car is warm or wet

Possible causes

• Loose, corroded or damaged connector at the drive motor coolant temperature sensorlikely
• Chafed, broken or intermittently shorted wiring between the sensor and the control unitlikely
• Failing drive motor coolant temperature sensor with an intermittent internal faultpossible
• Water ingress or coolant leak affecting the sensor or its connectorpossible
• Poor reference voltage or earth supply to the sensor circuitpossible
• Fault inside the inverter or motor control unitrare

How to diagnose

1. Read all stored codes and the freeze frame data, noting motor temperature, coolant temperature and vehicle state when the fault set
2. Check for related codes covering other motor, inverter or coolant temperature sensors, as these point to a shared wiring or supply fault
3. Inspect the sensor connector and nearby wiring for corrosion, moisture, bent pins, loose fit and chafing, and check for coolant leaks around the sensor
4. Watch the live motor coolant temperature reading while gently moving the wiring and connector, looking for dropouts or spikes
5. Compare the sensor reading with other coolant temperature readings on a cold car; they should be close
6. Follow the manufacturer's high-voltage safety procedure before touching any high-voltage components; the sensor itself is a low-voltage circuit, but its location varies by model
7. Check the sensor circuit for continuity, short to earth or supply, and resistance against the manufacturer's specification, and check the sensor's resistance against temperature
8. Check the sensor supply voltage and earth at the connector, with the exact test depending on the model

How to fix

• Clean, repair or replace the damaged or corroded connector and terminals
• Repair or replace the damaged section of wiring, securing it clear of heat and rubbing points
• Replace the drive motor coolant temperature sensor if its readings are erratic or out of specification
• Fix any coolant leak or water ingress, then dry and protect the connector
• Repair the supply or earth fault on the sensor circuit
• Clear the code after repair and road test to confirm it does not return; if the control unit is suspected, follow manufacturer guidance, as this is rare

Can I keep driving?

Nearby codes

• P0CBFGenericDrive Motor A Coolant Temperature Sensor Circuit High
• P0CC1GenericDrive Motor A Coolant Pump Control Circuit/Open