Code Definition

P0A41 (245) — Drive motor A position sensor signal low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Toyota

About P0A41

P0A41 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0A41 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0A41 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

On Toyota hybrid systems Drive Motor A, commonly MG2, uses a resolver whose sine and cosine outputs the Power Management Control ECU reads for rotor position. DTC P0A41 sets when the ECU detects the voltage amplitude of a resolver output, either the sine or the cosine signal, below a calibrated threshold. A low amplitude means a weak or degraded waveform, which compromises the ECU ability to determine rotor position accurately. This usually arises from a short to ground, high resistance in a feedback circuit, weak excitation, or a degrading resolver. With the signal low the hybrid system will ...

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