Generator Position Sensor Circuit Overspeed

Where it lives

For P0A50, the circuit described runs through the sensor. The description of P0A50 reports a fault at the sensor.

Check these first

• A worn or damaged generator position sensor
• A generator position sensor installed loosely
• A short or open in the sensor circuit
• An alternator overrunning the normal range
• A control module fault

What to do next

1. Read generator speed and position data on a scan tool
2. Verify the generator speed against the commanded value
3. Test the sensor circuit for short or open
4. Check the alternator operation
5. Replace the sensor if the reading is erratic
6. Clear the code and retest

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