Action Taken When The DTC Sets
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 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:
- Fails to 2nd or 5th 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 either lock in Neutral or shift to Reverse, unless the transmission is compromised by overspeeding or direction change, then the transmission will lock in Neutral.
- DTC will be stored in the TCM history.
- Illuminate MIL when active.
- The TCM freezes shift adapts.
- TCM inhibits TCC engagement.