Action Taken When the DTC Sets

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0756 is a Type A DTC.
The TCM inhibits TAP function.
The TCM inhibits TCC.
The TCM freezes transmission adaptive functions.
The TCM commands high line pressure.
The transmission defaults to Reverse gear, 1st gear, or 3rd gear.