Control Module Internal Temperature Sensor A Circuit

Where it lives

For P0666, the circuit described runs through the sensor. The description of P0666 reports a fault at the sensor.

Check these first

• An open or short in the internal temperature sensor circuit
• A failed internal temperature sensor
• A poor module ground
• A module running hot from a nearby heat source
• A failed control module

What to do next

1. Read the internal temperature on a scan tool
2. Check the module ground and power feed
3. Look for a heat source near the module
4. Test the sensor circuit for an open or short
5. Replace the control module if the sensor circuit will not read
6. Clear the code and retest

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