* Based on opinions and should be considered as general guidance only.
- Reliability (4)GMC heavy-duty trucks generally have a strong reputation for reliability, especially with the Duramax diesel engine. While no vehicle is perfect, major issues are uncommon, and it's built to withstand demanding work.
- Maintenance (3)Maintenance costs can be higher than average due to the specialized components of a heavy-duty diesel truck. Parts and labor for the Duramax engine and Allison transmission can be expensive, though routine service intervals are reasonable.
- Technology (4)The infotainment system is user-friendly and responsive, with Apple CarPlay and Android Auto. It offers a good suite of driver-assist features, though some advanced features found in luxury cars might be missing. The camera system for towing is particularly impressive.
- Comfort (5)The Denali trim truly shines in comfort. The interior is luxurious with premium materials, heated and ventilated seats, and a quiet cabin that makes long drives enjoyable. The ride quality, while firm due to its HD nature, is excellent for a truck of this size.
- Dynamics (4)For a heavy-duty truck, the 2020 Sierra 3500HD Denali handles surprisingly well. The steering is responsive, and it feels stable even when towing heavy loads. It's not a sports car, but it's very capable for its class.