reno360

I can understand that part for sure, thanks. The weird thing is that it would speed up past my setting by 5 or 10 mph and then settle back down and then speed up again - never slowing all the way to the set speed. I unplugged the fuse F18 for a bit and will test again sometime today.

Thanks for the reply - I'll check on that when I get home. I have cycled between regular and adaptive cruise several times. The regular cruise holds the speed as expected. If I put the adaptive cruise speed limit to 75, for example, the truck speeds up to over 80 and immediately slows down to around 75 and then speeds up and slows down again... constantly. I haven't replaced the windshield or anything - other that R & R of the front bumper.

Does anyone know where the adaptive cruise control parts are located on the 2021 GMC Sierra 1500? I don't use it often so not sure when it stopped working but this weekend it did not hold the speed correctly at all. I recently had my front bumper removed and replaced due to an accident and this is the first time I have used it since. Are there any components in the bumper that may have gotten unplugged and not replaced? Thanks

I have a 2021 AT4 which I absolutely love but I can't figure one thing out. When I remote start the truck in cold weather, the truck will turn on the heated seats, heated steering wheel, and climate control features to warm the inside. As soon as I press the pushbutton start, it all goes off. I know that's by design because my Silverado does the same thing. What's curious is that my Cadillac CTS-V has the same options but when I get in, all the climate features are on until I turn them off or adjust them. It's such a nice feeling to get into a vehicle that stays warm instead of shuts all controls off when you press the start button. The same thing happens in the hot months with the cooling features... Does anyone know if there is a way to program this into the new Sierras?

I just got back from a 500 mile trip out of town and experienced the same howling on the driver's side of my 2021 AT4. Anyone know which weather stripping the dealers are changing out to alleviate this? Thanks

I had the Bakflip MX4 installed originally and removed it and replaced it with the Retrax Pro and both retained the grab handle. Both had pros and cons but I really like the Retrax Pro.

I have a set that came off my 2021 AT4 the first month I had it. I traded them out for some Amp Research steps but now I'm cleaning out my garage and will let them go for $550. You'll have to pick them up from Humble, TX (Northeast of Houston).

No travel plans in the near future... sorry.

I have a set for sale in Houston, TX... pickup only. They came off my 2021 AT4 at about 1200 miles. I switched them out for some Amp Research because they were too high for my girlfriend. $550

I just purchased and installed the Retrax Pro XR and am extremely pleased with it. I do like the fact that it locks in place anywhere along the rail. The XR also has the tracks for a rail system so I can store items above the bed and open the cover when needed. I previously had a BakFlip MX that I took off and put on my old Silverado because I didn't want it to go to waste.

I have a 2021 AT4 that I have had for about 5 months and just noticed that there seems to be a piece missing on the front valance. There are a dozen or so push rivet holes that are empty and the existing piece is warping and hanging down badly. I compared it to my buddies Denali and he has another small air dam type valance under this plastic piece that I don't have. Was this left off by design on the AT4? or is it just mine? Sorry for the bad pic but this might help...

The High Clearance steps were installed on my 21 AT4 when I bought it - I think they look great but to be honest, as a step, they are not too helpful for my girlfriend who is 5' nothing. The steps are almost at the same level as the sill so it was difficult on entry. I took them off and put on a set of Amp Research retractable steps and like them much better

I was wondering the same thing. I contacted DiabloSport and was told the same - they are working on it but don't have a date. They asked if I would be interested in being in the test group and of course I said yes - but never heard back from them.

When I bought my new AT4 a month ago, the dealer was pushing their Nano Protection - is anyone familiar with this process? They said they do a light sanding and paint correction (if needed) and then apply the coating - I have a few questions specifically is it the same as a Ceramic Coat is it dealer specific or GM-wide? what else is included? Any information you guys may have is greatly appreciated.

Correct - completely stock (6.2L - not sure if that is heavier or lighter on the front suspension than other engines...)