Code Definition

P0A2B (248) — Drive motor A temperature sensor signal out of range

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

About P0A2B

P0A2B 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 P0A2B 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 P0A2B 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 and Lexus hybrid systems the Power Management Control ECU, also referred to as the HV ECU, monitors the Drive Motor A temperature sensor, a thermistor that reports motor winding temperature for thermal protection. DTC P0A2B sets when the ECU detects the sensor signal voltage is outside the expected valid range, either too high or too low, indicating an open circuit, a short circuit, or an implausible temperature reading. The thermistor resistance falls as temperature rises, so an out of range voltage reflects a sensor or wiring fault rather than a genuine thermal event. When the code...

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