OBD
P0A78
Drive Motor A Inverter Performance
What it means
P0A78 means Drive Motor A Inverter Performance.
Check these first
- A failing inverter module
- High voltage battery problems
- A motor control module fault
- Damaged inverter wiring or connectors
What to do next
- Read drive motor A inverter data on a scan tool
- Inspect the inverter wiring and connectors
- Check the high voltage battery condition
- Test the motor control module
- Replace the inverter if performance is off spec
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.