P0A54 Drive Motor B Speed Sensor Circuit Range/Performance

P0A54 points to Drive Motor B speed sensor range or performance. The speed signal exists but does not match expected 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 assume Motor B is faulty until speed data is compared with position data and inverter command.

Useful checks before replacing parts

Compare Motor B speed with position sensor data, inverter command, torque request, vehicle speed, freeze-frame data, and related performance codes.
Inspect sensor mounting, shielded wiring, connector fit, ground integrity, water intrusion, and electromagnetic interference from high-current cables.
Monitor speed data during acceleration, deceleration, and regenerative events to identify lag, dropouts, or implausible changes.

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.