Drive Motor B Position Sensor Circuit Overspeed

Where it lives

For P0A4A, the circuit described runs through the sensor. The description of P0A4A reports a fault at the sensor.

Check these first

• A failed drive motor B position sensor
• A short or open in the position sensor circuit
• A resolver wiring fault between the motor and inverter
• Mechanical damage inside drive motor B

What to do next

1. Inspect the motor B position sensor wiring and connectors
2. Check the resolver circuit for opens, shorts and shield faults
3. Compare the motor B position signal with motor A on a scan tool
4. Check for abnormal noise or binding from drive motor B
5. Replace the position sensor or resolver if the circuit tests good
6. Clear the code and retest

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