Conditions for Setting the DTC: P0742
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet 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.