P0A1D Drive Motor B Control Module

P0A1D indicates a Drive Motor B control module fault. The hybrid system detected a problem with the module or control path responsible for Motor B operation.

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 replace the Drive Motor B module until power, ground, communication, cooling, and high-voltage safety checks are complete.

Useful checks before replacing parts

Check Drive Motor B control module communication, power and ground, torque command, motor speed, inverter status, DC bus voltage, and freeze-frame data.
Inspect module connectors, coolant or water intrusion, low-voltage supply stability, high-voltage interlock status, harness damage, and related inverter or motor codes.
Verify whether the fault is module communication, internal performance, motor feedback, or supporting power and ground before replacement.

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.