Control Module Internal Temperature Sensor A Circuit Low

Where it lives

For P0668, the circuit described runs through the sensor. The description of P0668 reports a fault at the sensor.

Check these first

• A short to ground in the internal temperature sensor circuit
• A failed internal temperature sensor
• Corrosion at the module connector
• A poor module ground
• A failed control module

What to do next

1. Read the internal temperature on a scan tool
2. Inspect the module connector and sensor circuit for a short to ground
3. Check the module ground
4. Compare the reading to ambient temperature
5. Replace the control module if the reading stays low
6. Clear the code and retest

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