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We just brought home a 2021 Acadia Denali and have had two instances where it has had trouble shifting into gear. Feels like a bad transmission slip that gets to the point that I can't even drive it out of my driveway now (car is in drive, engine revs like it is in neutral).

I was able to get it drivable again the first time it happened by switching it in and out of tow/haul mode as that seemed to force it to pick up a low gear. The dealer couldn't reproduce it and just reprogrammed some software per a GM bulletin, but the issue re-occurred a day later. I didn't use the tow/haul 'trick' to force it back into gear so the dealer can experience the issue.

Since this is a new model, I was curious if any other '21 owners had any transmission issues to report. It is possible I just got a lemon that was put together late on a Friday afternoon...
Yes, I have been having issues with the trans. Not switching into gear, getting stuck. It has been in 4 times already. Also it makes a lawnmower type noise as it is stuck shifting.
 

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I wanted to add to this forum that we too are having issues with our 2021 acadia denali transmission. 6k miles and started at 500 miles. In the morning is when the shudder is really bad between 1-2 and 2-3 gears and have had issues when slowing down the transmission shifting hard. Took it in two times now, first time they said computer didn't download anything so no issues. Second time they said there is a bulletin to flush the transmission so they flushed it still said no codes were noted. We are taking it back in a third time because after the flush it is almost undeliverable.
 

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Not good to hear about issues with this 9 speed transmission. Sounds similar the the 8 speed issues.
 
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