Makes it convenient for powering laptops, phone chargers and other electronic devices
May require additional optional equipment
3.5" diagonal monochromatic Driver Information Center
4-way manual driver seat:
Can be positioned forward or back and up or down
4-way manual front passenger seat:
Can be positioned forward or back and up or down
40/20/40 split-bench front seat with covered armrest storage:
Seating for up to 3
Center fold-down armrest with storage
60/40 split-folding rear bench seat:
Includes child seat top tether anchor
Can fold one or both sides up
Cruise control:
Maintains a selected speed while driving
Automatically disengages when the vehicle's traction control system needs to limit wheelspin on slippery surfaces or when the StabiliTrak® stability control system detects an oncoming skid
Set and resume speed functions
Steering-wheel mounted controls to easily maintain and manage cruising speed
Inside rearview manual day/night mirror:
Adjust the tilt of the mirror to help reduce glare during nighttime driving
Manual tilt steering column:
Allows the steering wheel to be manually adjusted up or down
Provides extra comfort when entering or exiting the vehicle
Locking security feature
Power door locks:
Programmable
Allows you to lock and unlock doors easily whether it's from the driver or front passenger seat or from outside using the key fob (when equipped)
Power windows with driver express-up/down:
Quickly raises the window or lowers it with the touch of a button
If an obstruction is detected, the anti-pinch feature will auto-reverse
Power windows with front passenger express-down:
Quickly lowers the window with the touch of a button
If an obstruction is detected, the anti-pinch feature will auto-reverse
Power windows with rear express-down:
May require additional optional equipment
Rear air vents:
Provides cabin comfort for rear occupants
Rear window defogger:
Helps to keep your rear view clear of fog or frost
Utilizes a warming grid to help remove fog or frost from the rear window
Remote Keyless Entry:
Allows you to lock and unlock doors of the vehicle with the key fob
Driver's door or all doors unlock at the touch of a button
Includes panic alarm button
Includes remote start with panic button and door lock/unlock function
Includes remote locking tailgate
May require additional optional equipment
Rubberized vinyl floor covering:
Provides good traction and convenient cleanup
Single-zone climate control:
Maintains a selected temperature
Manual
Steering wheel
USB ports:
2 located on instrument panel1
Upfitter switches:
Program electrical components such as exterior lighting, snow removal equipment or other features to turn on and off at the flip of a switch
Allows the driver to operate upfitter-installed equipment conveniently from inside the cab
Provides 3-30 amp and 2 20 amp configurable circuits to facilitate installation of aftermarket electrical accessories by the dealer or upfitter1 at customer expense
Installation instructions and technical assistance available at www.gmupfitter.com
When properly equipped; includes weight of vehicle, passengers, cargo and equipment
220-amp alternator:
May require additional optional equipment
3.42 rear axle ratio:
Requires a diesel engine
4-wheel antilock disc brakes:
Help reduce wheel lockup and maintain steering control during hard braking on most slippery surfaces
DuraLife™ brake rotors feature a hardened surface to reduce corrosion and provide quieter braking with less vibration. DuraLife™ rotors are hardened and strengthened during the manufacturing process
Brake system features a corrosion-fighting process called Ferritic Nitro-Carburizing (FNC) which can double rotor life expectancy and reduce or minimize rust over non-FNC coated rotors
6.6L Duramax Turbo-Diesel V8 engine:
445 hp [332 kW] @ 2800 rpm
910 b-ft. of torque [1220 Nm] @ 1600 rpm
3.42 rear axle ratio
Exhaust brake
Engine block heater
Capped fuel fill
Paired with an Allison® 10-speed automatic transmission
Diesel Exhaust Fluid (DEF) fill located in fuel door
Engine after run feature for cooling performance
May require additional optional equipment
63.5 gallon (240 liters), Dual front and rear fuel tanks:
Front 23.5 gallon, (89 liters)
Rear 40 gallon, (151 liters), mounted between frame side rails and behind rear axle
May require additional optional equipment
Air filtration monitoring:
Alerts the driver when the engine air filter needs replacement
Allison® 10-speed automatic transmission:
Electronically controlled with overdrive for smooth-shifting performance
Tow/Haul mode that reduces shift cycling for better control and improved cooling when towing or hauling heavy loads
Auto Grade Braking that automatically downshifts when needed to enable engine braking, helping to slow the vehicle on downhill grades and reduce brake wear (operates in Tow/Haul mode)
May require additional optional equipment
Automatic locking rear differential:
When the differential senses a significant difference in wheel speed, it locks to turn both rear wheels in unison for added traction
The Eaton® Locker senses a difference in wheel speed of approximately 100 rpm
Autotrac® 2-speed transfer case with push button controls:
4-button control 2WD, Auto, 4WD, 4WD LO
2WD High for most on-road and highway situations
4WD High for snowy or wet roads when added traction is needed
4WD Low for deep sand, mud or snow to provide maximum torque to all 4 wheels
When in AUTO mode, remains in 2WD mode until the system detects wheel slippage
Automatically engages 4WD until traction is regained
Neutral
ONLY used for towing vehicle (Dinghy tow capability)- allows vehicle to roll freely
May require additional optional equipment
Black vertical recovery hooks:
Two front frame-mounted1
Chassis Cab body
Diesel exhaust brake:
Reduces the amount of conventional braking needed while towing a heavy trailer or driving downhill
Uses the variable vanes in the turbocharger to smoothly and quietly create additional back pressure in the engine to help slow the vehicle
Works with the transmission's Tow/Haul mode and Auto Grade Braking to help the driver maintain the desired speed even on long, steep downgrades
Switch activated
May require additional optional equipment
Electronic shift 2-speed transfer case with push button controls:
System shift smoothly between drive settings to handle a variety of road conditions
2WD High for most on-road and highway situations
4WD High for snowy or wet roads when added traction is needed
4WD Low for deep sand, mud or snow to provide maximum torque to all 4 wheels
Neutral
ONLY used for towing vehicle (Dinghy tow capability)- allows vehicle to roll freely
May require additional optional equipment
Engine block heater:
Helps ease cold weather starts
Heats the engine and engine block fluids
External auxiliary transmission oil cooler:
Heavy-duty air-to-oil cooler
Helps provides optimal transmission performance even when operating under a heavy load or towing a trailer
May require additional optional equipment
External engine oil cooler:
Heavy-duty air-to-oil cooler
Helps extend engine oil life under heavy loads
Fully boxed frame:
Hydroformed front section
High-strength steel
Heavy-Duty Air Filter:
Thick construction helps to trap more dirt before it can enter the air intake
High idle switch:
Runs the engine in High Idle mode, holding the engine at approximately 1200 rpm
Operates using the cruise control buttons on the steering wheel
High Idle mode is deactivated when you turn off the truck or before you drive off
May require additional optional equipment
Integrated trailer brake controller:
Integrated with the antilock brake system (ABS)
Helps provide measured brake force signaling to electric-controlled trailer brake systems
Trailer gain and output are displayed in the Driver Information Center
Suspension Package:
Designed to help maintain handling and ride quality while towing a trailer or carrying a load
Dual-stage frontal airbags for driver and front outboard passenger1
Seat-mounted side-impact airbags for driver and front outboard passenger1
Head-curtain airbags for outboard seating positions1
Includes front outboard Passenger Sensing System for frontal outboard passenger airbag and illuminates a status light that indicates whether the airbag is on or off1
Teen Driver:
This configurable feature lets you activate customizable vehicle settings associated with a key fob to help encourage better driving behavior
It can limit certain vehicle features, and automatically turns on certain safety systems if vehicle is equipped
An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driver
Tire Pressure Monitoring System:
Monitors the pressure in each tire and alerts you if there is a low-pressure condition in one or more of the tires1
2021 GMC Sierra 3500HD Base Summit White 4WD Duramax 6.6L V8 Turbodiesel 10-Speed Automatic
KBB.com Consumer Reviews
Overall4.2Out of 5
2020 GMC Denali 3500 HD Duramax is a BEAST!
By Merlinsmerc | on Friday, January 22, 2021
5.0
Pulling a conventional 10,000 lb trailer over mountain passes is a whole new experience. Staying at the speed limit up long steep grades did not change the engine temperature. I feathered the accelerator up the mountain. The new 10 speed transmission is so smooth you cant feel it changing gears. This is my second GMC Denali Duramax, first being a 2016. I debated trading in for over a year, and am so happy I made the trade. Trailers always exceed by far the tongue weight posted on them, and in my case it came in at 1450 lbs. That exceeded my trucks posted maximum. The 2020 dually posts a 2,000 lb tongue weight, so now I can front load the trailer, and that reduces sway. If you can afford it, and have a heavy trailer, buy the truck!…
Love our truck
By Ron | on Friday, December 11, 2020
5.0
The truck doesn’t have a sun roof which it was suppose to have…
In shop for 13 weeks so far!
By Whip | on Monday, September 09, 2024
2.0
My truck has been in the shop for 13 weeks to this point with no end in sight. The Infotainment panel blew out which controls pretty much everything. Nice truck except if something goes wrong then, good luck! I would recommend looking at Fords and Rams and ask the question, how many vehicles do you have in your shop waiting for parts and for how long. I heard of one at my GMC dealership that has been waiting for 8 months! Only thing I get from GM is "we understand your frustration". Apparently they don't, or I would have my truck back long ago.…