• GMC Sierra HD Truck.
2021 GMC Sierra HD Key Attributes.

2021 GMC SIERRA HEAVY DUTY – WORLD-CLASS POWER

The 2021 GMC Sierra Heavy Duty is built with hardworking fleets in mind. A larger drive shaft than the previous generation combines with the Allison® 10-speed automatic transmission and a new rear axle to deliver durability and strength. The available six-function MultiPro™ Tailgate as well as larger bed dimensions inside and out make towing and hauling look and feel easy.

2021 GMC Sierra HD Truck Dimensions.

Safety features or driver assistance features are no substitute for the driver’s responsibility to operate the vehicle in a safe manner. The driver should remain attentive to traffic, surroundings and road conditions at all times. Visibility, weather and road conditions may affect feature performance. Read the vehicle’s Owner’s Manual for more important feature limitations and information

SAFETY

  • Fully boxed ladder-type frame with nine cross members
  • Available Automatic Emergency Braking7
  • Standard Rear Vision Camera7
  • Available HD Surround Vision7, Bed View Camera7 and Rear Camera Mirror7 with up to 15 available camera views3
  • Available Safety Alert Seat7
  • Available Forward Collision Alert7
  • Available Lane Change Alert with Side Blind Zone Alert7

PERFORMANCE

  • 6.6L V8 gas engine (401 hp/464 lb.-ft.) with 6-speed automatic transmission featuring Cruise Grade Braking and Powertrain Grade Braking
  • Available 6.6L V8 Duramax® Turbo Diesel (445 hp/910 lb.-ft.) with available Allison® 10-speed automatic transmission
  • 4-wheel anti-lock disc brakes with Duralife® brake rotors
  • Available Integrated Power Take Off (PTO)
  • Heavy-duty locking rear differential
  • Available Gooseneck/5th Wheel Prep Package
  • StabiliTrak® Electronic Stability Control System with Trailer Sway Control and Hill Start Assist
  • Available ProGrade Trailering System that features an In-Vehicle Trailering App4 offering customized trailer profiles

PRODUCTIVITY

  • Available MultiPro™ Tailgate: World's first six-function tailgate
  • Apple CarPlay®5 and Android AutoTM6 compatibility
  • 12 fixed cargo bed tie-downs rated at 227 kg (500 lb.s) per corner
  • Folding rear bench seat
  • LED headlamps with GMC Signature LED Lighting and LED tail lamps
  • New BedStep feature and larger CornerSteps
  • Roll-formed high strength steel bed

GALLERY

GALLERY

  • GMC Sierra HD Truck Interior Dash View.
  • GMC Sierra HD Truck Interior Front Seating.
  • GMC Sierra HD Truck Front Exterior.
  • GMC Sierra HD Truck Side Exterior.
  • GMC Sierra HD Truck Side Exterior.
  • GMC Sierra HD Truck Rear View.
  • GMC Sierra HD Truck Side Step.
GMC Sierra HD Truck Trailering  Technology.

CUTTING-EDGE TRAILERING TECHNOLOGY

  • Available ProGrade™ Trailering System with In-Vehicle Trailering App4 featuring trailer light test, customizable trailer profiles, trailer tire pressure and temperature monitoring, pre-departure checklists and trailer theft alert7
  • With up to 15 available unique camera views3 to help improve hitching and towing experience
  • Available transparent trailer view for compatible trailers3

POWERFUL ENGINE OPTIONS

  • Standard 6.6L gasoline V8 engine with Direct Injection and Variable Valve Timing
  • 401 hp (11% increase*) and 464 lb.-ft. of torque (22% increase*)
  • Available Duramax® 6.6L V8 Turbo-Diesel engine with Allison® 10-speed automatic transmission – (445 hp/910 lb.-ft.)
GMC Sierra HD Truck Engine Options.
GMC Sierra HD Truck MultiPro Tailgate.

MULTIPRO TAILGATE

Sierra’s available MultiPro Tailgate is essentially two tailgates in one. The world’s first six-function MultiPro Tailgate consists of the primary gate and a smaller inner gate. Raising and lowering these two tailgate panels in different combinations allows MultiPro to take on a variety of different roles.

AVAILABLE FLEET PACKAGES

 
The 2021 Sierra HD is designed to stand up to the toughest jobs, with available advanced trailering technologies and other options that help take that capability even further. Equip your truck with specialized, fleet-specific packages that combine features to help keep your drivers comfortable and in control.

FLEET CONVENIENCE PACKAGE

FLEET COMFORT PACKAGE

1SA SAFETY CONFIDENCE PACKAGE

  • EZ-Lift Power Lock and Release Tailgate
  • Heated, power-adjustable vertical trailering mirrors
  • Power door locks (Regular Cab)
  • Power windows with front passenger express-down and driver express-up/-down (Regular Cab)
  • Remote Keyless Entry

  • 10-way power driver seat with power lumbar control
  • 120-volt AC power outlet
  • 120-volt AC bed-mounted power outlet
  • Dual-zone automatic climate control
  • Heated driver and front outboard passenger seats
  • Rear-window defogger
  • Tilt/telescoping steering column

  • Forward Collision Alert7
  • Automatic Emergency Braking7
  • Cruise Control
  • Steering wheel audio controls
  • Driver Information Centre

FEATURES & SPECS

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