New 2022 Sierra AT4 Refresh (6.2L) drive modes?

it's the tires and their speed rating. if you have the AT tires, you have sport mode (mine has sport mode). If you have the MTs, you do not.
 

So can Sport mode be turned back on if your truck does not currently have it?
 

Good question
so that is a big NO upon further research it is the mud terrain tires if equipped cancels out the sport mode and the trucks that have it grayed out that was a mistake from the factory and has a service bulletin for an update to remove it
 

How do you get non-MT tires? They came standard on the 20" wheels and I'm assuming on the 18s even more so. Was there some option where you could actually choose an AT tire?
 

yes if you build a sierra you can pick AT or MT with the 20" wheels and the 18" is only MT. so i supposes it is how your truck was ordered from the dealer
 

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