P0CF5
Control Pilot Circuit Low.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- C
- AreaHybrid propulsion
- F5
- FaultThe specific fault in that area
What it means
P0CF5 means the control unit that manages charging saw the control pilot signal at a lower voltage than expected. The control pilot is the signal wire between the charging equipment and the vehicle. It tells the car that a charger is connected, how much current is available, and whether charging may start. Low voltage can come from a wiring fault, a fault in the charge port, the charging cable or the vehicle's own charging electronics.
Symptoms
- Vehicle will not start charging, or charging stops soon after it begins
- Charging warning or plug-in system fault message on the dashboard
- Charge port indicator light flashing, showing an error or not lit
- Charging works on one charge point or cable but not another
- Charge port lock or connector latch not behaving normally
- Reduced or unavailable electric driving on a plug-in hybrid
Possible causes
- Faulty charging cable or external charge point supplying a low or incorrect pilot signallikely
- Damaged, dirty, corroded or water-affected pins in the vehicle charge port or in the pluglikely
- Wiring fault between the charge port and the charging control unit, such as a short to ground, chafing or high resistancepossible
- Poor connection or corrosion at a connector in the control pilot circuitpossible
- Fault inside the on-board charger or charging control modulepossible
- Outdated or faulty control unit software where the manufacturer lists it as a known cause for the modelrare
How to diagnose
- Read all stored and pending codes and the freeze frame data. Note whether other charging, high voltage or communication codes are present.
- Ask which charge points and cables were in use when the fault set, and when it happens. Try a different known-good cable and charge point to separate an external fault from a vehicle fault.
- Inspect the charge port and plug for bent, burnt, dirty, corroded or wet pins, debris and damage to the seals and flap.
- Inspect the visible wiring and connectors from the charge port to the charging control unit for chafing, water ingress, pushed-back pins and corrosion. Follow the model's wiring diagram.
- Check the control pilot voltage and signal at the vehicle side while a known-good charger is connected. Compare it with the manufacturer's specification, which varies by model.
- With the vehicle powered down and following high voltage safety procedures, test the pilot wire for continuity, resistance and shorts to ground. Only suitably trained staff should work on high voltage systems.
- Check the charging control unit's power and ground supplies and its communication with the rest of the vehicle.
- Check for manufacturer service bulletins or software updates relevant to the vehicle and the code.
How to fix
- Replace or repair a faulty charging cable or have the external charge point repaired or checked
- Clean or replace a damaged or corroded charge port and fix any water ingress path
- Repair or replace damaged wiring and connectors in the control pilot circuit
- Restore good connections by repairing terminals and applying the correct sealing
- Replace the on-board charger or charging control module once the wiring, port and supply checks are all good
- Apply a manufacturer software update only if it is a documented fix for this fault on the vehicle
Can I keep driving?
The vehicle can usually still be driven while it has charge or fuel, but you may not be able to recharge it. Have it checked soon, and stop using the charge port if you see damage, burning smells or heat.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.