Conditions for Setting the DTC: P0742
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.
The TCM detects the TCC slip between -20 and +40 RPM for 4 seconds when the TCC is commanded OFF. This must occur 3 times.