Output Shaft Speed Sensor Circuit High

Where it lives

For P077D, the circuit described runs through the sensor. The description of P077D reports a fault at the sensor.

Check these first

• A short to power in the output speed sensor wiring
• A failed output speed sensor
• High resistance in the sensor circuit
• Corrosion at the sensor connector
• A TCM fault

What to do next

1. Read output speed on a scan tool
2. Test the sensor circuit for a short to power
3. Measure the sensor circuit resistance
4. Inspect the connector for corrosion
5. Replace the output speed sensor if the circuit is sound
6. Clear the code and retest

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