Drive Motor B Phase U Current Sensor Circuit High

Where it lives

For P0BF4, the circuit described runs through the sensor. The description of P0BF4 reports a fault at the sensor.

Check these first

• A phase U current sensor reading above its normal range
• A short to voltage in the phase U sensor circuit
• A fault in the motor B phase U windings
• High resistance in the phase U sensor circuit

What to do next

1. Read drive motor B phase U current on a scan tool
2. Test the phase U sensor circuit for a short to voltage
3. Check the motor B phase U windings for faults
4. Measure the phase U current sensor output against spec
5. Replace the phase U current sensor if the circuit tests good
6. Clear the code and retest

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