Action Taken When The DTC Sets

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

TCM performs the following actions if DTC is set:

If failure occurs before shifting is completed, then the transmission will shift to Neutral. If failure occurs while the shifting is being completed, then the transmission will shift to Neutral or 1st gear while diagnostic response is active.
If the gearshift lever is moved to Neutral, then the transmission will shift to Neutral.
If the gearshift lever is moved to Reverse, then the transmission will shift to Neutral or Reverse.
If the gearshift lever is returned to Drive, then the transmission will shift to Neutral or 1st gear.
DTC will be stored in the TCM history.
The TCM inhibits TCC engagement.
The TCM freezes shift adapts.
Illuminates the MIL when active.
TCM inhibits TCC engagement.