P0D06
Control Pilot Charging Ventilation Switch Stuck On.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- 06
- FaultThe specific fault in that area
What it means
P0D06 is a generic hybrid/EV charging code. The charging control unit has detected that the ventilation switch in the control pilot (charge handshake) circuit is stuck in the on position. The control unit sees the ventilation state signalled when it has not commanded it, or sees the switch state fail to change when it should. The exact circuit layout and the way the fault is detected vary by model.
Symptoms
- Charge warning light or hybrid/EV system fault message on the dashboard
- Vehicle will not charge, or charging starts then stops
- Charging is slower than normal or is limited
- Charge port indicator shows a fault or flashes unexpectedly
- Malfunction indicator lamp on, with the code stored in the charging or hybrid control unit
Possible causes
- Fault in the control pilot circuit wiring, such as a short to voltage or ground, or chafed insulationlikely
- Corroded, damaged or contaminated terminals in the charge inlet or its connectorlikely
- Ventilation switch or relay in the charging circuit stuck or failed in the on statepossible
- Fault in the charging control unit or on-board charger that misreads or wrongly drives the switch circuitpossible
- Faulty external charging equipment or cable giving an incorrect pilot signalpossible
- Water ingress in the charge port or related connectorsrare
How to diagnose
- Read all stored codes and freeze frame data, and note whether the fault is current or intermittent and whether other charging or hybrid codes are present
- Try a different charging cable and charging point, to rule out external equipment
- Inspect the charge port and inlet for debris, moisture, bent or corroded pins and heat damage
- Check the wiring and connectors in the control pilot circuit for chafing, water ingress and poor pin tension, following the manufacturer's wiring diagram
- Check the live data for the control pilot or ventilation switch status with the car unplugged and then plugged in, and see whether it follows the expected state
- Measure the control pilot circuit voltage and resistance against manufacturer specifications. High-voltage precautions apply and only suitably trained technicians should do this
- Test the ventilation switch or relay and the charging control unit supply and earth feeds, if the model has them
- Check for manufacturer service information or software updates relating to this code for the specific model
How to fix
- Repair or replace damaged wiring and connectors in the control pilot circuit
- Clean or replace a corroded or damaged charge inlet or port
- Replace a faulty ventilation switch or relay if the model has one
- Replace or repair the charging control unit or on-board charger if testing confirms it is at fault
- Replace a faulty charging cable or have the external charging equipment repaired
- Clear the code after the repair and confirm that a full charge cycle completes without the fault returning
Can I keep driving?
The car can usually still be driven, but it may not charge properly, so on a plug-in model you may be left without enough range. Have it checked soon, and stop using the car if there are high-voltage warnings, burning smells or the charge port is hot or damaged.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.