P0A30: Drive Motor B Temperature Sensor Circuit
What to do
Same picture as P0A2A, with one addition — if this motor drives the rear axle, its wiring lives under the car and inspection should start there, especially after winter or unsurfaced roads.
What this code means
The second drive motor's temperature sensor circuit has failed.
Motor B is the second machine on two-motor systems — most often an electrically driven rear axle. Everything at P0A2A transfers: the sensor is the motor's overheat protection, circuit codes are electrical rather than thermal, and the wiring is the first suspect because the thermistor lives inside the motor.
One difference is worth a sentence: a rear-axle motor's harness runs under the car, where road debris, salt and trapped mud do their work. The corpus's underfloor-wiring cause earns its place here more than anywhere else in this family.
Likely causes
Start here
- Road damage to underfloor wiring · moderate
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
Less common
- Faulty motor temperature sensor · specialist
Symptoms
Components involved
Information, not instruction
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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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