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Sounds like the Engine Coolant Valve to me,

Is anyone else seeing a shaking/ shudder to truck drivetrain at 40 and 50 mph at low rpm range/ top gear at that speed?

I am unsure if this was due to the two water pump system in these trucks, but yeah I hope they take a look at the amount of issues related to it and do a refresh to the part while recalling the old insufficient parts...

I hope they improve this valve as so many have an issue. I am still waiting for my part to come but if I need to replace it every 3 years or 70k that is BS.

The real issue is the height of socket part of the plug, it is very short. I had mine replaced once with another OEM plug but now have an aftermarket plug with a taller socket on the plug.

E85is 70% efficient to straight gasoline and is never ever 70% cost so the loss is crazy as you pay more for less plus the energy use to refine it. Ethanol needs to just go away.

Biodisel and ethanol also terrible uses of crops. Better used to feed things, not diminish use of the energy in fossil fuels. Alcohol helps to race, not get a vehicle down the road economically plus the added energy to make a lower MPG fuel is just insanity.

Yeah, and adding it to wiring insulation is why rodents eat it. Stupid, stupid use in that application.

they went to forged steel because the upped the compression. 15.0 to 15.2

https://gmauthority.com/blog/2021/12/gm-releases-valve-lifter-service-update-for-v8-engines/

That is for V-8 engines, 5.3L

had mine done October 9th, was getting no crank about once a month and have had none since. I think it fixed my truck for sure.

got it two weeks ago. had the issue every month since I bought the truck. So if it doesn't happen by December I will assume it is fixed. It seems to pause on crank (may be the cooler weather, i dunno) and cranks faster maybe now. All i have seen so far.

I got the latest flash which was released 10/4/21. Dealership I bought the truck at was zero help and had to go to another dealer that knew what i wanted over the phone and got me in a couple days. So, Vermilion Chevrolet in Danville, IL is garbage and Alsop Chevrolet in Attica, IN is very good...

So there is an ECM flash for this now? I have had the issue 4 times now over 4 months of owning my 2021 GMC Sierra

Technical Service Bulletin: #20-NA-218 Jan 2021 Revision calls for reflash ECM

Have had this happen 2x times now on my 2021 Sierra. Sounds like a machine gun going for 10 ish seconds after trying to start it then it powers off and fires up on next start. Goes into dealer this Friday. Initially thought was starter noise but could be the crank. Happened 6/10/21 and 7/26/21...