Action Taken When the DTC Sets

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

P0746 or P0747

P0746 or P0747 are Type A DTCs.
TCM disables transmission adapts learning and freezes current adapt values.
TCM commands default shift pattern and ignores all other shift requests.
TCM inhibits Tap Up/Tap Down.
TCM inhibits TCC.
TCM requests the ECM to disable powertrain braking.
TCM requests the ECM to disable neutral idle.
TCM requests the ECM to disable auto grade braking.
TCM requests the ECM to disable auto stop function.
Transmission shifts to 4th gear, if P0746 sets.
Transmission shifts to 2nd gear, if P0747 sets.
Transmission reverse gear is available.