![]() ![]() I'm now scheduled to take it back in on Monday 8-9-21 to have the torque converter replaced. This is the main problem the fluid change is supposed to fix. Now at 94k miles it has started producing the hard shuddering at certain speeds. I took it in to replace sensor and as a result they had to change the fluid at which time they told me they replaced it with the new recommended fluid. 2020 with 60k miles a transmission temperature sensor failed on the transmission. Fixed the issue for a while but then started back after about 10k miles. Took to dealership and they reprogrammed the transmission control module. In my instance the transmission started shifting hard with less than 30k miles. The latest TSB states that a new blend of transmission fluid is the fix. In my research there have been no less than 13 TSB's issues by gm trying to rectify these issues. This involves transmission in 2015-2019 model trucks, both GMC and Chevrolet, among other gm vehicles. Gm has known issues, which I'm sure the NHTSA is aware of. I was charged to have them look for a problem and if this a known issue to both gm and the ntsb shame on you both. The last statement made was also odd, the service advisor told me that the clink is because the transmission sometimes goes from 3rd to 1st and skips second gear. I have printed service re odds for each I have complained about the transmission and now believe the dealer was aware of the issue and gm bulletins coached them how to tell me there is no issue. I would like to see what investigation ntsb has done on this topic. I would like to see a recall as this isn’t just my issue. I fear the value of this vehicle is impacted by so many complaint, no action by ntsb, and questionable practices by two gm dealers that serviced my vehicle. My standard powertain warranty has expired after 5 years. I was never shown a bulletin on any reported issues and would like to see every one related to the 8 speed transmission. Online websites show many posts of owners hanging this issue. Since then the transmission has a light clunk shifting at low speed so I wonder if they lied and flushed the fluid. After 4 hours they told me nothing is wrong. I immediately scheduled a service to look at this. ![]() I had two others in the vehicle that observed this over 20 times. I have 56,000 miles now and the latest complaint I made was when nearing a stop at 5-10 mph the transmission did a massive clink. They did a flush and replace and for a time period it settled down. ![]() The dealer told me this was a know issue related to the transmission manufacturer lubricant conflicting with the GMC transmission fluid. A large clunk sound and vibration occurred after shifting gears in the 30 mph range. I have persistent transmission problems documented on multiple dealer visits where I purchased the vehicle. ![]()
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