2024 Gmc Sierra 2500hd Denali Ultimate Speed. Sierra 2500 hd denali ultimate. With a sticker price nearing $100k, the 2024 gmc sierra 2500hd denali ultimate is the most extravagant truck we’ve ever driven.

View detailed specs, features and options for the 2024 gmc sierra 2500hd 4wd crew cab 159 denali ultimate at u.s. I assumed it was related to gps and not onstar.