Auxiliary Cooling System Coolant Temperature Sensor A Circuit

Where it lives

For P0E81, the circuit described runs through the sensor. The description of P0E81 reports a fault at the sensor.

Check these first

• An open or shorted auxiliary coolant temperature sensor A circuit
• A failed sensor A in the auxiliary cooling system
• Corroded pins in the sensor A connector
• A broken wire between sensor A and the control module

What to do next

1. Inspect the sensor A wiring for opens and shorts
2. Check the sensor A connector for corrosion
3. Measure the sensor A signal with the system running
4. Compare the reading to ambient
5. Replace the auxiliary coolant temperature sensor A if the circuit does not recover
6. Clear the code and retest

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