I am still having ongoing issues with the exact same crap going on. I have had the truck in the shop for 34 days now total and it is going back today. Shifting all erratically yesterday and today the check engine light finally came on. Maybe now theyll be able to acknowledge there is something wrong. Truck has 5800 miles, has already had a torque converter installed (no fix), tranny reset 3 times (no fix), and an entire exhaust system installed (suppose to fix the rattling noise, which it did not). Dealer say theyll just keep putting exhausts in it since thats the only thing they can do. As far as the tranny issues, I have been pushed out the door multiple times with, no problem found. I have requested GM reps to come out and have been denied. Does not seem GM or it's dealers are able to provide the customer support that is needed here. I ca not wait to get rid of this POS.