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I would hope the dealer at least reset the computer so it can "relearn." Worth a shot anyway. They should also check the wiring and sensors to the transmission. With everything computerized these days a break in the wire can cause major issues. Also, GM needs to pay it's techs more for warranty work so they do a proper job of tracking down the issues.
 

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I purchased a 2018 enclave two months ago with 40,000 miles on it. Almost immediately I felt the shuddering from gears shifting because I just went through the same experience with my 2010 Yukon and that’s why I traded it in the first place. I took it to the dealership today and 3 1/2 hours later they told me they reprogrammed the ECM and changed the transmission fluid. I have to drive it two hundred miles to see if the problem still persists, but I could tell as soon as I drove it off the lot that the problem is still there. On a different subject, but sort of ties into the issue, I can’t stand the start stop feature on this vehicle. And even worse, you cannot disable it without purchasing an item to plug into the ODB II receptacle. I called the company to see which one I should buy because there is also an item to disable the AFM (active fuel management system). On their website, it says if you disable the AFM the shutter may stop. So, besides thinking the problem is a torque converter, it could be the AFM. The company is range technology, and they don’t have an item that disables both the AFM and the start/stop feature at the same time. It’s either one or the other. Here’s the kicker, the thing cost $200. The salesman that sold me the car, luckily for him, was not in there today.
 

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2018 Premium. Shuddering began around 15k, usually if the nose was down like on a steep driveway. Was very intermittent. Pandemic hit and we didn't drive it that much due to the kids being home doing online schooling. But anytime it was driven it shuddered on and off. In low gears. I finally got my husband to take time off work to take it in. The local dealership had it 3 DAYS and said there's no problem, but it was time for its transmission flush. :unsure: at 42k miles? Fine, but hey! It's going to cost me $300. (Btw I HATE this dealership.) Picked up the Enclave and it seemed like it was better. WOO!! Then...2 days later it bucked and shuddered. They won't do anything about it."Its a quirk". Now we're at 49,600K miles and I'm waiting on 2022's in the Enclave and a few other brands to be released. My issue is it shudders and bucks on cold starts or if it's been off for over 2 hours at the least. It doesn't do it usually once it's going and past the low gears. but occasionally there's a BANG and it shudders.

I'm really NOT looking forward to a 3rd Enclave. They've gotten WORSE as time goes on. But we cannot find a 7 passenger that has the space the Enclave has. We don't like Toyota's or Honda's, as their tech seems to be behind.

I hate my local dealership and do anything I can to avoid them, but they're the closest and none of the Chevy dealerships want to touch it.
 

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You don't like Toyotas or Hondas? Like all the latest "tech?" Then get used to these types of problems. Sorry but I've LIVED the many, many problems with my 2009 Buick Enclave I bought new. I spent well over $8,000 on repairs, and I have only 90,500 miles. I can't believe after all the transmission issues with the first generation Enclave, they wouldn't put some money into the new Enclave transmission to ensure it lasts at least to 200,000 miles with no issues providing regular maintenance is done. If Toyota can do it, so can GM, but their MBA Cost Accountants won't let them.

So GM products are lease only, provided you're okay with all the time you'll spend at the dealership. But hey at least you'll get to know your service advisor really well.
 

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Nope. Hate the look of Toyota and Honda. We also don't buy into their hype of long life. We've had a few and various family members and friends have or recently had them and they left for other brands. Faulty electrical, transmission, paint issues, window motor issues, bad customer service, etc are the main gripes. We also have 5 kids and unless we want a minivan, none of their SUVs were big enough or comfortable enough, or they drove bad for us. We 100% understand more frills, more problems. We typically only keep the 7 passenger the length of the warranty. Which mine was up at 50k, aka 2 weeks ago. We were gung ho for the refresh, then the pandemic happened and we waited. The longer we have waited the more disenchanted we've become with the Enclave. I'd likely be more excited if I didn't have a trash dealership. 3 days for them to tell me the transmission just needed a flush. They also said our brakes were bad, despite them being new and when we checked them, they were perfectly fine. There's way more to my interactions with them, but we bought 1 vehicle there and that was it. But unfortunately, if the vehicle has a problem I'm stuck having it towed there. If it has something wrong with it and it's driveable, I can either go there or an hour out of my way to the next closest.

I LOVE the style of the Buick. I LOVED my '15 also. But face it, most cars are 'disposable' anymore. Not just GM.
 
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