2021 GMC Sierra 2500HD AT4 Automatic

• Bed Liner, Spray-on, Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel) (AT4 logo replaces GMC logo. Not available with any Ship Thrus EXCEPT (VSH), (VTV), (TCH) or (TCE).)
• Bed Step, Black integrated on forward portion of bed on driver and passenger side
• Bumper, front, body-color lower
• Bumper, rear body-color with bumper CornerSteps
• Cargo tie downs (12), fixed rated at 500 lbs per corner
• CornerStep, rear bumper
• Door handles, body-color
• Fog lamps, LED
• Glass, deep-tinted
• Grille (Painted Black surround with high gloss Black mesh and Black chrome inserts.)
• Headlamps, LED reflector (high intensity) with LED turn signals and LED signature Daytime Running Lamps
• Lamps, cargo area cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel
• LED Cargo Area Lighting located in cargo bed activated with switch on center switch bank or key fob
• Mirror caps, high gloss Black
• Mirrors, outside power-adjustable vertical trailering with heated and auto-dimming upper glass, (driver and passenger) lower convex mirrors, turn signal indicators, puddle lamps, perimeter lighting, auxiliary lighting, power folding/extending (extends 3.31 [84.25mm]) (Molded in color Black.)
• Moldings, beltline, Black
• Tailgate and bed rail protection caps, top
• Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
• Tailgate, GMC MultiPro Tailgate with six functional load/access features
• Taillamps, LED signature taillight with LED stop and reverse light
• Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
• Tire, spare LT275/70R18 all-terrain, blackwall
• Tires, LT275/70R18E all-terrain, blackwall
• Wheelhouse liners, rear
• Wheels, 18 (45.7 cm) machined aluminum wheel with Dark Grey metallic accents

• 4G LTE Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)
• Air conditioning, dual-zone automatic climate control
• Air vents, rear
• Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
• Audio system feature, 6-speaker system
• Audio system, Premium GMC Infotainment System with 8 diagonal color touch-screen includes multi-touch display, AM/FM stereo, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for infotainment and vehicle settings (Includes (PZ8) Hitch Guidance with hitch view.)
• Bluetooth for phone, connectivity to vehicle infotainment system
• Center Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
• Compass, located in instrument cluster
• Cruise control, steering wheel-mounted
• Defogger, rear-window electric
• Door locks, power
• Driver Information Center, 4.2 diagonal color display includes driver personalization
• Driver memory recalls driver presets for power driver seat and outside mirrors
• Exterior Temperature Display, located in radio display
• Floor covering, color-keyed carpeting
• GMC Connected Access capable (Subject to terms. See onstar.com or dealer for details)
• Instrument cluster, 6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure
• Keyless open and start
• Mirror, inside rearview auto-dimming
• Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
• Power outlet, front auxiliary, 12-volt
• Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
• Power outlet, rear auxiliary, 12-volt
• Premium Floor Liners with removable carpet insert, front
• Premium Floor Liners with removable carpet insert, rear
• Radio, HD
• Rear seat reminder
• Remote vehicle starter system
• Seat adjuster, driver 10-way power including lumbar
• Seat adjuster, passenger 10-way power including lumbar
• Seat trim, Perforated leather-appointed front
• Seat, Up-level Rear with Storage Package, 60/40 folding bench for Crew Cab models, includes full-length bench seat, seatback storage on left and right side, center fold out armrest with 2 cupholders, full cab width under-seat storage, (includes child seat top tether anchor)
• Seating, heated driver and front outboard passenger
• Seats, front bucket with center console
• Seats, heated second row outboard seats
• Seats, ventilated driver and front passenger
• SiriusXM Radio
• SiriusXM Radio with 360L Equipped with SiriusXM with 360L. Enjoy a trial subscription of the All Access package for the full 360L experience, with a greater variety of SiriusXM content, a more personalized experience and easier navigation. With the All Access package, you can also enjoy your favorites everywhere you go, with the SiriusXM app, online and at home on compatible connected devices. (IMPORTANT: The SiriusXM radio trial package is not provided on vehicles that are ordered for Fleet Daily Rental (FDR) use. If you decide to continue service after your trial, the subscription plan you choose will automatically renew thereafter and you will be charged according to your chosen payment method at then-current rates. Fees and taxes apply. See the SiriusXM Customer Agreement at www.siriusxm.com for complete terms and how to cancel. All fees, content, features, and availability are subject to change. GM connected vehicle services vary by vehicle model and require active service plan, working electrical system, cell reception and GPS signal. See onstar.com for details and limitations.)
• Steering column, lock control, electrical
• Steering column, manual Tilt-Wheel and telescoping
• Steering wheel audio controls
• Steering wheel, heated
• Steering wheel, leather-wrapped
• Theft-deterrent system, unauthorized entry
• USB Ports (Inside Console with bucket seats), 2 also includes 1 SD card reader and auxiliary jack
• USB ports, 2 (first row) located on instrument panel
• USB ports, dual, charge-only (2nd row)
• Window, power front, passenger express up/down
• Windows, power front, drivers express up/down
• Windows, power rear, express down
• Wireless Phone Projection for Apple CarPlay and Android Auto

• Air filter, heavy-duty
• Air filtration monitoring
• Alternator, 170 amps (Requires (L8T) 6.6L V8 gas engine.)
• Auto-locking rear differential
• Battery, heavy-duty 720 cold-cranking amps/80 Amp-hr, maintenance-free with rundown protection and retained accessory power (Included and only available with (L8T) 6.6L V8 gas engine.)
• Brake lining wear indicator
• Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
• Capless Fuel Fill (Requires (L8T) 6.6L gas V8 engine.)
• Cooling, auxiliary external transmission oil cooler
• Cooling, external engine oil cooler
• Engine, 6.6L V8 with Direct Injection and Variable Valve Timing, gasoline, (401 hp [299 kW]
• Four wheel drive
• Frame, fully-boxed, hydroformed front section and a fully-boxed stamped rear section
• GVWR, 10,650 lbs. (4831 kg) (Included and only available with TK20743 model and (L8T) 6.6L V8 gas engine with 18 or 20 wheels or TK20943 and (L8T) 6.6L V8 gas engine with 17 wheels.)
• Hill Descent Control
• In-vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder, trailer electrical diagnostics and Trailer Tire Pressure Monitor System module (Includes trailer tire pressure monitoring alert ONLY when (PTT) trailer tire pressure monitor system is factory ordered and sensors are installed.)
• Pickup bed includes bed assist step
• Rear axle, 3.73 ratio (Requires (L8T) 6.6L V8 gas engine.)
• Recovery hooks, Red
• Skid Plates protect the oil pan, front axle and transfer case
• Steering, Digital Variable Steering Assist This system automatically adjusts steering based on speed, road conditions, and other inputs to reduce driver effort and fatigue
• Suspension, Off-Road includes twin-tube shocks
• Trailer brake controller, integrated
• Transfer case, two-speed active, electronic Autotrac with push button control
• Transmission, 6-speed automatic, heavy-duty

• Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag (Always use seat belts and child restraints. Children are safer when properly secured in a rear seat in the appropriate child restraint. See the Owner's Manual for more information.)
• Daytime Running Lamps, LED signature lighting
• HD Rear Vision Camera
• Hitch Guidance dynamic single line to aid in truck trailer alignment for hitching
• Hitch Guidance with hitch view with Image adjustment, Pan/Zoom/Tilt
• OnStar and GMC connected services capable (Terms and limitations apply. See onstar.com or dealer for details.)
• StabiliTrak, stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assist
• Teen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob, to help encourage safe driving behavior. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. 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 with Tire Fill Alert (does not apply to spare tire)

Model Highlights

The Sierra HD comes in one of several different body styles with long and short bed options. However, despite this complexity there are only two available engines, both V8 units displacing 6.6 liters. The gasoline option is paired to a 6-speed automatic and makes 401 horsepower and 464 lb-ft of torque. The more expensive diesel engine is aided by a turbocharger and makes 445 horsepower and a massive 910 lb-ft of torque. Unlike the gasoline engine, the diesel is mated to a 10-speed automatic to handle all that torque. When properly equipped, a Sierra HD 3500 should be able to tow up to 35,000lbs with a 5th wheel attachment, or 20,000 lbs with a traditional trailer hitch, thanks in large part to the massive torque produced by its diesel V8. Sierra HD models are available with either rear-wheel drive of selectable four-wheel drive. The Sierra HD comes in either 2500 form or 3500 form with 3500 versions offering a bit more towing capacity and payload because they can be optioned with a "dually" setup, giving the truck an extra pair of wheels on the rear axle. Both trucks can be optioned with a regular cab, a double cab featuring four conventional doors, or a crew cab with even bigger rear seats. Truck beds are either 6'9" or 8' depending on configuration, though the only restriction to bed size is in the regular cab version, which always comes with the longer bed. In addition to copious options for the basic architecture of the truck, Sierra buyers are also offered plenty of choices when it comes to the tech in their new vehicle. GMC's ProGrade Trailering system features fifteen camera views to help keep an eye on things behind the truck, even counting a class exclusive transparent trailer view among its features. The available heads up display on the Sierra HD is massive, measuring 15-inches across, while the rear-view mirror can be switched between displaying an actual mirror and the view from the rearward facing camera. GM claims their MultiPro tailgate is the world's first six-function tailgate. In practice that means it's easy to load things into and out of the back of the truck, while also providing a ton of utility options for carrying loads with the tailgate dropped. It also has a built-in step to make it easier to climb in and out of the bed of the truck. Concentrating on off-roading capabilities, 4AT models come standard with four-wheel drive along with a more off-road biased suspension setup that includes Rancho Shocks. Other standard features on the 4AT include skid plates, an Eaton locking differential, Michelin all-terrain tires, a heads-up display, GMC's HD Surround Vision camera system, hill descent control and an off road mode. Most buyers though, will probably opt for the Denali version of the Sierra HD. Available in both 2500 and 3500 forms, Denali versions of the Sierra HD come standard with the bigger crew cab, body colored front and rear bumpers, LED lights in the cargo bed, tinted glass, LED headlights, daytime running, front fog and taillights, powered external mirrors, a MultiPro tailgate, UltraSonic front and rear parking sensors, Lane Departure Warning, Lane Change Alert with Automatic Braking, Rear Cross-Traffic Alert, Following Distance Indicator and Hill Descent Control (HDC). The Denali Interior features include, 4G LTE Wi-Fi, Bluetooth and Apple CarPlay\Android Auto connectivity, an 8-inch infotainment screen and an 8-inch digital instrument cluster, an 8 speaker Richbass sound system, dual-zone climate control, heated front and rear seats, vented front seats, a heated steering wheel, keyless start and wireless device charging.