Code Definition

P0A37 (258) — Drive motor B temperature sensor signal out of range

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

About P0A37

P0A37 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 P0A37 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 P0A37 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 the Drive Motor B temperature sensor is a thermistor built into the hybrid transaxle motor assembly, and its signal is monitored by the Power Management Control ECU to protect the motor from thermal damage. DTC P0A37 sets when the ECU detects that the temperature sensor signal voltage is outside its valid range, either too high or too low to represent a real temperature. An excessively high signal voltage points to an open circuit or a sensor reading impossibly cold, while an excessively low signal voltage points to a short to ground or a sensor reading impossibly hot....

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