Lost Communication With Charge Air Cooler Temperature Sensor Bank 1

Where it lives

For U066D, the description names the sensor as the part involved. The description of U066D puts it on bank 1.

Check these first

• The bus loses the bank 1 charge air cooler temperature sensor
• An open signal circuit at the CAC sensor
• A corroded connector at the intercooler outlet
• A short in the bank 1 CAC sensor harness
• A failed charge air cooler temperature sensor element

What to do next

1. Read bank 1 charge air cooler temperature on a scan tool
2. Inspect the sensor connector and wiring
3. Check the signal and ground circuits
4. Compare the reading against ambient under load
5. Replace the bank 1 charge air cooler temperature sensor if it stays offline
6. Clear the code and retest

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