Code Definition

P0A31 — Drive motor B temperature sensor signal out of range

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

About P0A31

P0A31 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0A31 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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 P0A31 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

The powertrain or motor control module monitors the Drive Motor B temperature sensor, a thermistor that reports motor winding temperature for thermal protection. DTC P0A31 sets when the module detects the sensor signal voltage is outside the calibrated valid range, either too high or too low to represent a real temperature, for longer than a defined period. Because the thermistor voltage maps to a temperature, an out of range value indicates an open, a short, or a degraded sensor circuit. When the code is set the module may apply a default temperature, derate motor torque, and limit hybrid or ...

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