GMC Sierra 2500HD 2020–2023 car dimensions: 6352 mm long, 2079 mm wide and 2027 mm high. Unladen weight is 2,963 kg. Braked towing is 8,392 kg.
The cabin offers a standard 7-inch touchscreen with Android Auto and Apple CarPlay on base models, upgrading to 8-inch on higher trims. Single-zone climate is base while dual-zone automatic appears on SLT and above. Cruise control is optional on base and standard higher up. Rear vision camera is standard. Parking sensors, blind spot warning, lane departure warning and automatic emergency braking come in packages or as standard on Denali.
As a crew cab pickup the cargo area is the open bed. Standard bed holds about 69.5 cubic feet and long bed about 83.5 cubic feet with 12 tie-downs rated 500 pounds each.
Maximum conventional towing reaches 18500 pounds when properly equipped with the diesel engine in crew cab form. Fifth-wheel and gooseneck ratings hit similar peaks near 18500 pounds on 2500HD models. Payload tops out near 3979 pounds on lighter configurations.
The truck uses a fully boxed high-strength steel frame with heavy-duty axles and cooling upgrades especially for the diesel. AT4 adds Rancho shocks and skid plates for off-road work while all models include trailer sway control and tow/haul mode.
The Crew Cab cabin offers best-in-class front headroom and legroom with a taller seating position for a commanding view. Higher trims add 10-way power front seats with lumbar, heated and ventilated options, and heated rear outboard seats. Premium leather and wood trim appear on Denali models. Storage is plentiful with under-seat bins and multiple USB ports. Road noise is average for the class, though the diesel engine is noticeable at idle.
No EPA fuel economy ratings available for this heavy-duty truck.
Real-world diesel highway fuel use around 17 mpg in testing.
36-gallon fuel tank capacity.
Basic warranty 3 years/36,000 miles. powertrain 5 years/60,000 miles.
One complimentary scheduled maintenance visit included.
Six standard airbags plus StabiliTrak with trailer sway control and Teen Driver.
Heavy-duty trucks like this Sierra 2500HD lack official EPA fuel ratings. Real-world testing shows the available Duramax diesel returning about 17 mpg on the highway when unladen. The gas 6.6L V8 is thirstier in daily use. A 36-gallon tank supports long ranges between fills.
GMC covers the truck with a 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. Diesel engines get extended coverage in some cases. One free scheduled maintenance visit comes standard in the first year. Routine oil changes and inspections follow the owner's manual schedule based on driving conditions.
Crash tests from NHTSA or IIHS are not available for this generation. Standard equipment includes six airbags, electronic stability control with roll avoidance, trailer sway control, hill-start assist, a rearview camera, and Teen Driver. Higher trims or packages add blind-spot monitoring, rear cross-traffic alert, forward collision alert, automatic emergency braking, and lane departure warning.
Keeping the truck involves regular checks of the heavy-duty cooling system, especially with the Duramax diesel under load. The MultiPro tailgate and bed steps ease cargo access for daily work. ProGrade trailering features help with hitching and monitoring, reducing wear from improper towing. Use the oil life monitor and follow severe-service intervals if hauling often.
Length 6352 mm, Width 2079 mm, Height 2027 mm, Wheelbase 4037 mm (Sierra 2500HD 2020–2023)
Sources: manufacturer data, GMC pressroom 2020 Sierra 2500HD/3500HD specifications: Crew Cab standard-bed length, 2020 GMC Sierra Heavy Duty catalog 20GMCSRAHDRC-25: standard-bed cargo 69.6 cu ft , 6-speed automatic with the gas V8, 2020 GMC Trailering Guide GMTB20CT300: Crew Cab ground clearance 10.1 in.