P0D08

What it means

P0D08 means the hybrid or electric vehicle control system has detected that Positive Contactor A in the battery charging circuit is stuck closed. The control unit commanded the contactor open, or ran its pre-charge or weld check, and the voltage or feedback signal showed the circuit was still connected. Exact contactor layout and naming depend on the vehicle, so check the manufacturer's information for which contactor 'A' is.

Symptoms

• Warning lights for the hybrid or EV system, or a general fault light
• Vehicle will not charge, or charging stops or refuses to start
• Reduced power or limp mode
• Vehicle may not enter Ready mode or may not start
• Possible audible contactor clicking, or no clicking, at power-up or shutdown

Possible causes

• Charging positive contactor welded or mechanically stuck closed, often from switching under high current or repeated faultslikely
• Contactor control circuit fault holding the coil energised (wiring short or driver fault in the controlling unit)possible
• Faulty contactor feedback or voltage sensing causing a false stuck-closed readingpossible
• Wiring or connector damage, corrosion or water ingress affecting the contactor, its feedback or the charging circuitpossible
• Fault in the on-board charger or charge port circuit leaving voltage present when the contactor should be openrare
• Faulty battery management or charging control unit, or outdated software where the manufacturer lists it as a known causerare

How to diagnose

1. Follow the manufacturer's high-voltage safety procedure first; only technicians trained in high-voltage systems should go beyond basic visual checks and code reading.
2. Read all stored and pending codes with freeze frame data, noting charging state, voltages and whether the fault appeared during charging, start-up or shutdown.
3. Check for related codes covering other contactors, pre-charge, insulation resistance, the on-board charger or the battery management unit.
4. Visually inspect the charge port, charging cables, connectors and low-voltage wiring to the contactor for damage, corrosion, moisture or heat marks.
5. View live data for contactor commanded state against feedback state and for voltage on both sides of the contactor.
6. With the system safely isolated, test the contactor coil circuit and feedback circuit for shorts, open circuits and correct supply and ground per the manufacturer's procedure.
7. Test the contactor for welded contacts using the manufacturer's method, such as resistance or continuity across it in the isolated, commanded-open state.
8. Check for applicable software updates or technical bulletins for the model.

How to fix

• Replace the stuck or welded contactor, or the contactor assembly, as the manufacturer specifies.
• Repair or replace damaged wiring, connectors or terminals in the contactor control and feedback circuits.
• Replace a faulty sensor or feedback device if it is giving a false reading.
• Repair or replace the faulty charger, charge port or control unit once testing confirms it is the cause.
• Apply a manufacturer software update only if a bulletin identifies outdated software as a cause for this code.

Can I keep driving?

Nearby codes

• P0D07GenericBattery Charging System Positive Contactor A Circuit
• P0D09GenericBattery Charging System Positive Contactor A Stuck Open