P0D09

What it means

P0D09 means the control unit has detected that positive contactor A in the high voltage battery charging system is stuck open, so it will not close when commanded. The relevant control module commands the contactor to close for charging and monitors feedback and voltage, and it sets the code when the expected closed state or voltage is not seen. The exact contactor location and monitoring method depend on the vehicle, so check the manufacturer data for the model.

Symptoms

• Vehicle will not charge from an external charger or charging stops early
• Charging fault or service warning message on the dashboard
• Malfunction indicator or hybrid/EV system warning light on
• Reduced power or the vehicle will not enter ready mode on some models
• Charge port indicator shows a fault or charging does not start

Possible causes

• Contactor failed mechanically or electrically, with worn or damaged contacts or a burnt-out coillikely
• Wiring or connector fault in the contactor control or feedback circuit, including corrosion, damage or loose pinslikely
• Low 12 volt supply or a poor earth preventing the contactor from closingpossible
• Fault in the battery management or charging control module that is not commanding or reading the contactor correctlypossible
• Blown fuse or interlock circuit open, which inhibits contactor closurepossible
• Outdated control unit software where the manufacturer has a known fix for this coderare

How to diagnose

1. Read all stored codes and freeze frame data, noting charging state, battery voltage and whether other high voltage or contactor codes are present
2. Check the 12 volt battery condition and charging voltage, as low voltage can cause false contactor faults
3. Inspect the charge port, related wiring and connectors for damage, water ingress, corrosion or loose terminals
4. Check the relevant fuses and the high voltage interlock circuit status using manufacturer data
5. Use a scan tool to command the contactor and watch the live status and feedback signals while listening for the contactor click
6. Measure the contactor coil supply, control signal and earth against the manufacturer wiring diagram
7. Only if you are trained and qualified in high voltage systems, isolate the system and test the contactor and its resistance following the manufacturer procedure
8. Check for applicable software updates or technical bulletins for the specific model

How to fix

• Repair or replace damaged wiring, connectors or terminals in the contactor circuit
• Replace the faulty positive contactor or the battery junction assembly containing it, as specified for the model
• Restore a healthy 12 volt supply by charging or replacing the 12 volt battery and repairing any earth fault
• Replace blown fuses after finding the cause, and restore the interlock circuit
• Repair or replace the control module if testing confirms it is at fault, and update software where the manufacturer lists it as a fix

Can I keep driving?

Nearby codes

• P0D08GenericBattery Charging System Positive Contactor A Stuck Closed
• P0D0AGenericBattery Charging System Positive Contactor A Control Circuit/Open