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Any chance you have the TSB number?
2018 buick enclave transmission problems
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GM Part # 19317577 A.K.A. Mobil 1 LV ATF H.P. I’m not 100% sure but very close. I installed this in my 2016 Buick Enclave and it’s like a totally different vehicle in shifting and fuel economy. It’s designed to not collect moisture suspensions in the fluid.
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2018 Buick Enclave Premium. Took delivery in Dec 2017. Transmission had a hard shift in 5/6 when you start up (after sitting several hours/overnight). After that - no hard shifts. If you stop and let it sit for a few hours, sometimes you get a long shift or a bump again around 5/6 shift. Dealer did a programming update (don't have the bulletin number). After that - the first hard shift of the day is gone... however the hard shift after a few hours of sitting (once driven) does show up. I would think mine is probably an early production run. Also notice slight - very slight shudders around town... which is what I see from others in the forum.
Overall, fit, finish, all other items (except auto-start-stop annoyance) - the 2018 Buick Enclave is very well done. Fast, smooth, quiet.
Overall, fit, finish, all other items (except auto-start-stop annoyance) - the 2018 Buick Enclave is very well done. Fast, smooth, quiet.
We have a 2018 Enclave Avenir, which we bought in summer of 2019 with 5 miles on the clock (got a good deal, to say the least). It just barely has 4,000 miles on it now. When it had less than 2,000 miles last fall, I took it to a Buick dealership saying I wanted the TSB for the shudder issue solution applied to prevent it from happening in the future (even though I haven't experienced it). They did the fluid change to the "correct" fluid and the programming change. I don't get the shuddering the person who started this thread has, but I don't have hardly any miles on it yet either. Yes, it shifts often in city driving, but ours is very smooth so the shifting isn't noticeable unless you pay close attention to the tach. And, unlike our prior 2009 Enclave, this one pulls a big boat without frequent shift changes, which I like a lot better than our 2009 model. Both have/had the trailering package. The 2009 pulled better with the trailering button engaged - the 2018 doesn't need to have this mode engaged to prevent frequent shifts. So from my standpoint, I think the 9-speed 2018 Enclave transmission is superior to the 2009 6-speed transmission.
@Don1986 and @Elm32020 I have a 2010 Enclave with 160k miles. It started staying in first several months ago. I changed about 75% of the fluid and it stopped for several months. Started again a few weeks back, so I drained 3.5 quarts and replaced it. That did not help this time. It stuck in first on the first test drive.
One workaround is to put it in L and use the manual +/- button to shift. Works every time.
I checked the drained fluid and there is no metal whatsoever in the fluid - very clean.
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Yes, faulty gears speed sensor. 2018 with about 10,000 miles on it. Thanks GM for another undependable car on the road. Lucky for me, it was still under warenty. Purchased extended warenty when I purchased the car.
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I just took my 2018 Buick Enclave to the dealership to check on a problem with the the transmission. This Enclave only has 6,700 miles on it. I purchased it new in March of 2018. I noticed it stuttering in the two lowest gears when taking off from a stop. The technician tried diagnosing the problem, which took over 4 hours. He couldn’t figure out the specific issue, and is ordering a new factory transmission. He said GM will not allow them to tear into it, but require them to send it to the factory for further diagnosis. This obviously is very disappointing after driving it less than 7,000 miles. I will not be purchasing another GM product in the future.
I had a 2018 Avenir with 35,600 miles on it when I traded it. Shortly after getting new in December 2017 I took it back for the transmission shifting rough or slipping at times. They replace the fluid with a new recommended one and it was better but it still would occasionally have a hard shift or trouble figuring out which gear it really wanted.
I'm sure there is truth to some kind of a problem with these transmissions. I have an 18 Avenir and haven't had any problems. I did have the transmission fluid flushed early when these reports were coming out as a preventive measure, not because of actually experiencing anything. I have found that on these 9-speed transmissions, I've adjusted to driving these differently than those that previously had 4-speed automatics. Back in the days when automatics had fewer gears, one sort of drove them like manuals, where speed changes was all in the accelerator pedal. 6-speed automatics started changing the driving method a bit. Now these 9-speeds, for me at least, have really changed how I drive automatic transmission vehicles. I now generally hold the accelerator pedal almost constant, and let the engine and transmission deal with the acceleration and shifting. I don't use the accelerator pedal much for changing speeds on anything other than highways. If this makes a difference, I really don't know. But I've never experienced a smoother shifting automatic transmission in all my 63 years of driving. But I do drive our 18 Avenir differently than I've driven previous Enclaves or other vehicles with automatics that had fewer gears. Something to maybe consider. Changing driving habits is hard to do though.
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2018 26,000 miles and it’s being rebuilt! Had a whistle sound when accelerating and at a stop light the vehicle jerked forward as if we were hit from behind! It continued to struggle forward at stop signs as well.
Same thing is going on with mine. 2018 with 25k check engine light came on after jerking forward at stop sign. They said they're replacing instead of tearing down. My bigger question for you is how is your car now? Im suppose to ship mine to Germany next week and will have it there for 3 years. Im worried about future issues and the warranty???
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Mine is working great after rebuild they are trying to sell me an extra warranty to cover if future issues.
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Hard shifting after stopping at a light or when we just pulled in a lot and went to back out it said conditions unfavorable for shifting
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With all these transmissions issues I'm reading about, I'm really scared about buying any new GM vehicle. A transmission is a major part of a vehicle, and if GM can't get it right then I'd be concerned about long-term reliability if you own it once the warranty is up. If you lease, at least you will have a warranty the whole time you have the vehicle.
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I have a 2018 Buick Enclave that has had issues with the transmission since I got it. It now has 63,000 miles on it and I have a feeling I might have to have some major repairs like some of these people mentioned! Dealer can't find anything wrong with it. I am very sorry I bought this car!
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