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I’m sorry this is long but I’m at a loss. Bought my 2021 Yukon Denali in December 2020. In April, I started having intermittent issues with it shuddering when going up inclines. Had just gotten new gas and wondered if it was bad. Didn’t happen all the time so decided to get through that tank of gas. Got a new tank of gas and the next day my low oil light came on. Parked it for a few hours and it showed absolutely no oil on the dipstick, repeated an hour later and the same. Added a few quarts and the next morning it showed overfilled. Took it to the dealership and noticed the shuddering was better. They changed the oil and sent me on my way. Within a few days it was doing it again. It isn’t just inclines. But when it happens, it’s almost always when accelerating.

Two days at the dealership and they couldn’t find anything wrong with it. The service manager and technician were able to drive it and eventually recreate the issue. GM engineering said to replace the transmission. 3 weeks later I finally got it back. Within a day it was back to doing it again. It’s very random. Today I made 5 trips and it happened on 3 but not 2. The dealership wants me to bring it back to have someone ride with me. Anyone have any insight?
 

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I wonder if it’s the same issue I had with my Tahoe... it started with shuddering from time to time, I thought it might have been bad gas too. One day very suddenly though the check engine light started blinking along with other warnings stating multiple systems needed to be serviced, and I could hear very loud banging around in the engine. Luckily I was very close to the dealership and took it in immediately. We found out that the engine lifters had failed, and needed to be replaced. From the research I’ve done on this issue, it seems like it’s a very common one and it’s because of the Dynamic Fuel Management system that the engine lifters on a lot of these vehicles are failing. Another consequence of DFM is engines are consuming way more oil than would be expected. There‘s a device from Range Technology that you can buy to plug into the vehicle that deactivates the DFM system so that you’re always running on 8 cylinders, and in theory this would keep the engine lifters from failing again. The only issue is Range Technology hasn’t released a disabler compatible with the 2021 vehicles yet :-( As soon as they release one I’m buying it because I hate feeling like I’m just waiting around for this 70k vehicle to have an engine failure again
 
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