Third owner of 09 Envoy SLE. 120K mi. About 4 wks ago, when in Vt, I need the 4WD. It seemed to go in and out slower than I remember my 04 Envoy did. Back home , cycling in and out in warmer weather, seemed to work OK. Then about 2 wks ago, just before I was going to drive to Vt again, it gets stuck in 4WD. I turned control to A4WD, quite a few blinks, then steady. Turn to 4Hi, quite a few blinks, then steady. Turn back to A4WD, quite a few blinks, then steady back on 4Hi!! Turn to 2Hi, quite a few blinks, then back to 4Hi!! All this happened while driving straight, about 30mph. When I reached a corner and had to turn, steering was stiff. Drove short distance home and tried going forward and back with control turned to 2Hi. Plenty of blinks but still in 4Hi. Dang, have to drive to work the next day. Start next morning, 2Hi light is lit!! Drive to Vt. and back in 2Hi, no snow, car has a locker and I added to bags of sand. Take to dealer after getting back home, they can't find anything wrong!!! Didn't charge me either!!! Now I'm afraid to put in A4WD or 4Hi, don't want to get stuck. When I drove back and forth trying to get out of 4WD in my parking lot, I could hear the TC motor cycling continuously when I turned to 2Hi.