Diagnostic Test

CHECK FOR AN ACTIVE DTC 

1. Turn the ignition on.
2. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
3. With the scan tool, read active DTCs.

   Is the DTC active?

   Yes 

   • Perform the U0164-00-Lost Communication with HVAC Control Module in the BCM. Refer to  U0164-00-LOST COMMUNICATION WITH HVAC CONTROL MODULE  .

   No 

   • Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to  STORED LOST COMMUNICATION DTCS  .