Drive Motor B Phase U-V-W Circuit Low
The drive motor B phase U-V-W output reports a circuit low condition. The drive motor's position, current and temperature are watched continuously; a fault here downgrades the inverter to a safe operating point or triggers torque reduction.
Affected components
- Drive motor b phase uvw
- Drive motor b inverter
Common causes
- High likelihood: Phase wire shorted to ground
- Medium likelihood: Low-side switch open in inverter
- Low likelihood: Connector pins corroded - high contact resistance
Possible symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.