Manual Transmission Column Shift Problems of GMC Sierra

Have had this into the dealer at the first oil change and complained about transmission shifting issues and it being unsafe to drive. Complaints are: hard shift, it clunks both upshifting and downshifting. Going around corners from a stop the truck will either fall on its face or jerks you violently forward. In stop or go traffic it is unsafe and happens very frequently- it randomly accelerates (jumps) quickly on its own with slight pedal pressure to the point where you constantly have to be aware and have your foot near the brake or you cause an accident by rear ending the car in front, its as if the transmission electronics get confused on how to act. Feel shuddering from truck's motor where column shift lever would shudder violently where I was afraid it would vibrate out of position. Rough idle is inconsistent at lower speed where you see tach going up and down. Starting cold you give it an easy pedal to move and wouldn't go. Trans doesn't kick in until you press harder and sometimes will lunge. Have taken into the various dealers 5-6 times, valve body change, engine motor mounts change and dealers can find no fix. Gm powertrain was even involved with no help. Complained to the GMC hotline and they said need 12,000 miles on truck before the truck knows how to drive because of the �Smart� transmission where it learns you're driving habits. Complained there are 2 of us that drive it how can it learn each individuals driving when it doesn't really know who is driving. They finally said there is nothing that can be done for it, that is the way it is. This all happens sporadically in both city low speed driving and highway driving, turning, backing up or going forward from parking. Because of these issues, didn't really drive the truck much because of the problems.

See all problems of the 2017 GMC Sierra 🔎.