Diagnostic Aids
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
When attempting to set transmission control module internal DTCs, run the engine for at least 1 minute, and then shut the engine OFF for 30 seconds. Following this procedure will allow for a complete transmission control module shutdown. Program the transmission control module with the latest software version and retest the DTC to see if the DTC resets.