Automatic Transmission Control Module problems of the 2017 GMC Yukon

Tranny failed at 92k miles even though properly maintained. Since new tranny installed by dealer (out of pocket cost) had to return due to tranny slipping into neutral when driving highway speeds and taking foot off gas. Dealer performed tcm and ecm flash updates. Cost out of pocket for programming. Issue came back less than 2000 miles later.

First problem started back in may. . It’s went downhill ever since. Hard shifting was happening. Gm dealer said I needed a new transmission. Found out from local repair shop that I needed a torque converter ($600) multiple transmission fluid changes (apparently many issues for a lot of people) changed that. Then had to change valve body & tcm. ($540) everything started working but not 100% did a full tune up having multiple misfires constantly then shuttering when idle. Also replaced ecm ($200+)after changing all spark plugs, wires, oil, etc. The ac was having issues had been having issues for months. Kept adding freon had to replace ac condenser (works great now, was told by repair shop that’s also very common in these year models. Condensers are all weak in the same spot) just recently October 2022, my instrument cluster started going haywire. Gauges going off and on screens going blank. Had alternator and battery tested both test fine. No loss of power but when hitting the start/stop vehicle would continue to run and lock and unlock when it wanted. Husband took the alternator out to have it tested again. They tested 3x 1st. Good, 2nd error, 3rd bad ( it was overcharging at 16. 5v) replaced alternator ($290) gauges still going haywire, like before it is only sometimes, when they do it’s bad bad. . But I can also drive to town and back 20-30 miles and not the first issue. Just left gm with a new battery distribution fuse block ($153) because of course it can’t just be a regular ($8-10) mega fuse, hopefully this will fix my issue. We pay too much money for this vehicle to have all of these issues & none be under warranty. I’ve been having the taillight issues as well ever since I purchased the car in 2018. When I received the recall on the taillight it was 6 years up to 72,000 & of course my vehicle had 79k miles on it at that time so that’s wasn’t covered.