2026 GMC Sierra 3500 consumer reviews

Overall pretty good, however it is undocumented if you turn off or adjust some of the safety setting it will cause light on dash to come on and make you think issue with system (ex collision if you change from default of alert and brake to alert only). I think this is an issue and should not light dash light to indicate an issue with the system because of alert settings.

The Good:The powertrain on this 2026 Sierra 3500 Denali Ultimate is absolutely flawless. The engine and transmission work together perfectly, offering relentless power and smooth shifts under load. GMC also nailed the styling; it looks incredibly sharp on the road, and the overall fit and finish of the materials feel truly premium.The Bad:For a top-tier, six-figure luxury truck, the missing features and cost-cutting are hard to swallow. First, the factory audio system is absolutely terrible—completely flat and lacking any real depth. Second, the truck is missing basic convenience features you expect at this price, such as automatic approach lighting and proximity unlock. If you want the GMC illumination package, be warned: it does not come on the Ultimate straight from the factory, which makes no sense. Finally, despite GM pushing the technology across other lines, Super Cruise is still frustratingly unavailable on this model.Comfort Issues:While the cabin looks beautiful, the actual seating comfort falls flat. The seats are incredibly stiff, hard, and flat, making long road trips far less comfortable than they should be in a premium truck.Verdict:It is a mechanical masterpiece with gorgeous styling, but GMC cut too many corners on daily-driver tech, audio quality, and seat comfort for it to truly deserve the "Ultimate" badge.