P0A55: Drive Motor B Current Sensor Circuit
What to do
Expect this motor's contribution — often the all-wheel drive — to be limited or absent while stored. Signal wiring first, underfloor runs included on rear-motor cars.
What this code means
A current sensor watching the second drive motor has failed its circuit checks.
Everything at P0A51 transfers — measurement and protection in one part, sensors inside the inverter, external wiring as the reachable half. Motor B's inverter section may sit at the rear on rear-motor cars, putting its signal wiring in underfloor territory alongside the position and temperature runs already discussed at P0A45.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Corroded or loose connector · easy
Less common
- Road damage to underfloor wiring · moderate
- Faulty motor current 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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- The car — make, model, year and engine. The same fault behaves differently on each.
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