2025 Yukon Xl At4 Ultimate Towing Capacity. Under the hood, the at4 ultimate offers a choice of powerful engines. Learn the ins and outs about the new 2025 gmc yukon 4wd 4dr at4 ultimate.

For the first time, this diesel engine is available in both the gmc at4 and the new at4 ultimate trims. Find incentives, rebates, recalls, and warranty.