What it means
The positive contactor A of the battery charging system reports a circuit condition. HV charging path cannot be commanded reliably.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Positive contactor A is a high-voltage relay that connects the battery charging path when the control system commands it. The module monitors the contactor circuit and sets P0D07 when that circuit condition prevents reliable control of the high-voltage path.
Common causes
Most likely first.
- Contactor failed
- Wiring fault
Symptoms
- Check-engine or hybrid-system warning light on
- Charging may fail or stop
- Vehicle may not enter or remain in a ready state
How to diagnose it
- Use a scan tool to record freeze-frame data and check contactor A command and feedback along with related charging-system codes.
- Inspect the low-voltage connector and accessible wiring for contactor A for looseness, corrosion, or damage.
- Check the contactor control circuit and connector continuity using the manufacturer's procedure, since a wiring fault can prevent the command from reaching the contactor.
- Compare commanded and reported contactor states during an approved diagnostic check to determine whether the contactor responds.
- If the circuit and connections test correctly, have the contactor and charging-system control assessed using the manufacturer's high-voltage service procedure.
Common fixes
- Reseat a loose contactor control connector.
- Repair damaged or corroded low-voltage wiring and terminals in the contactor circuit.
- Replace positive contactor A if it fails the manufacturer's operational checks.
- Repair the control module circuit only after wiring and contactor faults have been ruled out.
Can I keep driving?
Do not drive if the vehicle will not enter or remain in Ready mode; charging may also fail, and reduced-power operation may occur. High-voltage contactor checks should be handled by a technician trained for the vehicle's high-voltage system.
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.