P0D0E
Battery Charging System Negative Contactor A Circuit.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- D
- AreaReserved
- 0E
- FaultThe specific fault in that area
What it means
P0D0E means the control unit has detected a fault in the circuit controlling the negative contactor (relay) 'A' used by the battery charging system on a plug-in hybrid or electric vehicle. The control unit commands the contactor and checks its feedback, control voltage or current. It set the code when the response did not match the command, or when the circuit reading was out of range. Exact contactor layout and monitoring method depend on the model.
Symptoms
- Warning light on, such as the system or hybrid/EV fault lamp
- Vehicle will not charge from an external supply, or charging stops partway
- Charging cable connects but no charge starts
- Reduced performance or limited driving mode on some models
- Vehicle will not enter ready mode on some models
- Audible contactor clicking is missing or irregular during plug-in or start-up
Possible causes
- Wiring fault in the contactor control circuit, such as open circuit, short to ground or short to supplylikely
- Damaged, corroded or loose connector at the contactor or control unitlikely
- Faulty negative contactor (coil failed or contacts stuck or burnt)possible
- Low or unstable 12 V supply or poor earth affecting the contactor drivepossible
- Fault in the battery or charging control unit driver circuitrare
- Moisture ingress or physical damage to the high-voltage battery or charger housing wiringrare
How to diagnose
- Read all stored codes and freeze frame data, noting whether the fault happened during charging, start-up or driving, and check for related contactor, isolation or 12 V codes.
- Check the 12 V battery condition and charging voltage, as low supply voltage can upset contactor control and set false faults.
- Carry out a visual inspection of the accessible low-voltage wiring and connectors to the charging and battery control units for damage, corrosion, water or chafing.
- Check for service bulletins or software updates for the specific model and for known contactor faults.
- Use a scan tool's live data and actuator tests, where supported, to see the commanded and reported contactor state.
- With the high-voltage system made safe by a suitably trained technician following the manufacturer's procedure, test the control circuit for continuity, short circuits and supply or earth, and check the contactor coil resistance against specification.
- Check the contactor's operation and contact condition only as the manufacturer's procedure allows, as this involves high-voltage components.
How to fix
- Repair or replace damaged wiring in the contactor control circuit.
- Clean, repair or replace faulty connectors and terminals.
- Replace the negative contactor or the assembly that contains it if testing shows it has failed.
- Correct 12 V supply or earth problems, including replacing a weak 12 V battery.
- Replace or reprogram the control unit only if the circuit and contactor are proven good, and only where an outdated or faulty calibration is a known cause.
- Clear the codes after repair and confirm a full charge cycle completes without the fault returning.
Can I keep driving?
The car may still be driveable depending on the model, but charging may be unavailable and the fault could worsen or leave the car unable to start. Have it checked soon, and stop driving if there are warnings of high-voltage faults or loss of power. Work on high-voltage parts must only be done by a trained technician.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.