Code Definition

P0A2B (250) — Drive motor A temperature sensor signal corrupt

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 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 monitors the Drive Motor A temperature sensor, a thermistor inside the transaxle that reports motor temperature for thermal protection. This subcode of DTC P0A2B sets when the ECU detects a corrupted or erratic signal from that sensor, meaning intermittent, noisy, or implausible fluctuations that do not correspond to real temperature change, rather than a steady out of range value. The instability usually points to a marginal connection, electrical interference, or an intermittently failing thermistor. When the code is set the...

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