What it means
The positive contactor A of the battery charging system reports a control circuit/open 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 commanded through a low-voltage control circuit that operates the relay connecting the high-voltage charging path. P0D0A sets when the module detects an open in that control circuit, such as a broken wire, open coil, or terminal that has backed out of its connector.
Common causes
Most likely first.
- Open in coil control wire
- Open coil
- Pin pushed back out of connector body
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
- Record freeze-frame data and check the contactor A command and related circuit codes with a scan tool.
- Inspect the contactor control connector for a pushed-back pin, poor seating, corrosion, or a damaged latch.
- Follow the accessible control wiring and look for breaks, chafing, or a disconnected section.
- With the high-voltage system made safe using the manufacturer's procedure, test control-circuit continuity and the contactor coil against the manufacturer's specification.
- If wiring and coil continuity are correct, check the control module output using the manufacturer's diagnostic procedure.
Common fixes
- Reseat a connector terminal that has backed out of the connector body.
- Repair an open or damaged contactor control wire.
- Replace positive contactor A if its coil is open.
- Repair the control module connection or output only after the circuit has been verified.
Can I keep driving?
The vehicle may not charge or enter Ready mode, so do not depend on it for a trip until the fault is resolved. Contact work around the high-voltage charging path requires the manufacturer's safety procedure.
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.