What it means
The control module has detected that positive contactor A remains electrically closed when it should be open. It sets the code when the contactor's monitored state does not match the command to disconnect the high-voltage battery during charging control.
How it works
Positive contactor A connects the high-voltage battery charging path when commanded and should open when the system requests disconnection. P0D08 sets when the module detects that contactor A remains electrically closed despite an open command, leaving the high-voltage path connected when it should be isolated.
Common causes
Most likely first.
- Welded or stuck contactor contacts
- Contactor driver circuit fault
- Damaged wiring or connector
- Faulty voltage feedback circuit
- Charging system control module fault
Symptoms
- Hybrid or EV system warning
- Vehicle may not start or enter Ready mode
- Charging may be disabled
- High-voltage system may remain active
How to diagnose it
- Record freeze-frame data and use a scan tool to compare the command to open positive contactor A with its monitored state.
- Check for related charging-system codes and review voltage feedback data that indicates whether the contactor is actually open.
- Visually inspect the contactor's low-voltage connector and accessible wiring for damage, corrosion, or a short that could affect its driver or feedback circuit.
- Test the contactor driver and voltage-feedback circuits according to the manufacturer's specification to distinguish a stuck contactor from a circuit fault.
- If the circuits test correctly, have positive contactor A inspected or replaced using the manufacturer's high-voltage service procedure.
Common fixes
- Repair damaged or shorted wiring or connector terminals in the contactor driver or feedback circuit.
- Restore a loose or corroded low-voltage connection to positive contactor A.
- Replace positive contactor A if its contacts remain closed after an open command.
- Repair or replace the charging-system control module only if its output or feedback processing fails the manufacturer's checks.
Can I keep driving?
Treat this as a high-voltage isolation fault: do not attempt to service the charging system or assume the battery is disconnected. Have the vehicle checked before charging or driving if it will not enter Ready mode or displays a high-voltage warning.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.