Conditions for Setting the DTC: P0742
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. 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.