P0A3D: Drive Motor B Inverter Over Temperature
What to do
Same check as P0A3C: the power electronics' own coolant loop, not the engine's. On a rear-motor car mention that layout to the workshop — the loop may run the length of the vehicle.
What this code means
The power stage driving the second motor got too hot.
Everything at P0A3C applies — the separate cooling loop, circulation as the usual story, heat as the ager of inverters. On rear-motor installations the second inverter sometimes sits at the rear with the motor it drives, with its own coolant run the full length of the car; a pipe or connection anywhere along that run is in play.
Likely causes
Start here
- Faulty inverter coolant pump · moderate
- Low inverter coolant level · easy
Less common
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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