OBD-II · Engine and powertrain (P)
P0A78
Drive motor A inverter performance
What it means
The inverter that powers the main electric drive motor has reported a fault.
Symptoms
- Hybrid/EV warning light
- Loss of power or car will not drive
- Car may not go into READY
Likely causes, most likely first
| No. | Cause |
|---|---|
| 01 | inverter overheating from a failed coolant pump or low coolant |
| 02 | internal inverter failure |
| 03 | motor or high-voltage cable fault |
| 04 | low 12V battery voltage |
What to check, step by step
- 01Check the inverter coolant level and pump operation
- 02Test the 12V battery
- 03Read all hybrid/EV codes and sub-codes
- 04Check for software updates or recalls for the inverter
- 05Have a high-voltage qualified technician test the inverter and motor