P0A2A Drive Motor B Temperature Sensor Circuit

P0A2A indicates a Drive Motor B temperature sensor circuit problem. The controller cannot trust Motor B temperature data used for thermal protection.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System: Hybrid / EV
Scope: iso-sae-controlled-p0
Standard: SAE J2012 / ISO 15031-6
Source: legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not continue high-load operation if Motor B temperature data is invalid or overheating is possible.

Useful checks before replacing parts

Compare Motor B temperature with inverter temperature, coolant temperature, motor load, freeze-frame data, and related hybrid cooling or temperature codes.
Inspect temperature sensor wiring, connector condition, sensor ground, reference voltage, motor connector sealing, coolant flow, and water intrusion.
Graph Motor B temperature from cold soak through loaded operation to confirm whether the signal changes smoothly and plausibly.

Related OBD-II codes

These nearby hybrid / ev entries can help compare wording and fault area. They may share the same verification status as the source database.