Due to current supply-chain shortages, certain features shown have limited or late availability, or are no longer available. See the window label or a dealer regarding the features on an individual vehicle.
ASSERT YOUR DOMINANCE
Engineered for the bold, the monstrous exterior of the Sierra Heavy Duty was built big so you can tow big.
TRAILERING MIRRORS
All Sierra Heavy Duty models are equipped with trailering mirrors. Also offered are:
- Available trailering mirrors that power fold or manually extend and retract, LED rear guidance lamps that help enhance your views when backing up with a trailer, lower convex mirrors, as well as amber auxiliary clearance lamps
- Available features of the power-adjustable trailering mirrors include:
- Heated and auto-dimming upper glass (driver and passenger)
- LED turn-signal indicators/clearance lamps
- LED perimeter lighting
- LED forward auxiliary task lighting
SIDE BED STEP
The Side Bed Step conveniently located just in front of the rear wheel arches complements the large CornerStep rear bumper to help provide easy access when grabbing equipment from the cargo bed.
DUAL PATH AIR INDUCTION SYSTEM
The Dual Path Air Induction System on the available 6.6L Duramax® Turbo-Diesel V8 engine draws dense, cool air through both the hood scoop and the large front grille to provide cooler induction air temperatures to help optimize horsepower and trailering performance.
ADVANCED LIGHTING
All Sierra Heavy Duty models are equipped with LED daytime running lamps, halogen taillamps and wheel molding amber arch lamps over each wheel. Also available are:
- Standard LED headlamps (high-intensity on Denali, AT4 and SLT)
- Available fog lamps
- Available LED fog lamps on SLE (standard on Denali, AT4 and SLT)
- Available LED cargo bed lighting on SLE (standard on Denali, AT4 and SLT)
- Available roof marker lamps on SRW (standard on DRW and Denali)
WORLD’S FIRST
SIX-FUNCTION MULTIPRO TAILGATE
The available GMC MultiPro Tailgate† offers six distinct functions designed to help improve loading, unloading and accessing the cargo box.
PRIMARY GATE
Open the primary gate using the key fob’s power release from inside the truck or from the button on the gate. These same buttons can be used to lock the gate once closed.
PRIMARY GATE LOAD STOP
With the primary gate open, the load stop can help prevent items from sliding out of the bed.
EASY ACCESS
The inner gate folds down for easy access when loading and unloading the bed.
FULL-WIDTH STEP
After removing the conventional hitch, the inner gate folds into a large step for easy entry and exit from the bed (step holds up to 375 lbs.).
INNER GATE LOAD STOP
The inner gate also includes a load stop to help prevent second-tier items from sliding out of the bed. The inner gate can be disabled to prevent it from being opened when a hitch or other equipment is installed.
INNER GATE WITH WORK SURFACE
The opened inner gate provides a work surface as well as second-tier loading.
PREMIUM DENALI FEATURES
Single Rear Wheel model shown.
EXTERIOR THAT CONQUERS
The Sierra HD AT4 off-road pickup truck pairs powerful performance with a bold, athletic look, delivered by way of distinctive finishes and modern, precise detailing.
CARGO BED INNOVATIONS
BEST-IN-CLASS HEAVY-DUTY CARGO BED VOLUME†
- Roll-formed high-strength steel bed
- Best-in-class Heavy-duty cargo box volume
- Standard Bed†: 69.5 cu.-ft.
- Long Bed†: 83.5 cu.-ft.
- 12 cargo tie-downs (500-lb. rating per corner)
- LED Lighting
- Available durable spray-on bedliner
CORNERSTEP REAR BUMPER†
SIERRA HD WHEELS
Each 2023 GMC Sierra Heavy Duty model comes equipped with an impressive set of standard or available head-turning wheels.
17" Painted Steel, Silver
17" Machined Aluminum
18" 8-Spoke Painted Steel,
Silver Extended
18" Machined Aluminum Wheels
with Dark Grey Metallic Accents
20" Machined Aluminum Wheels with Bright Silver Accents
20" Machined Aluminum Wheels with High-Gloss Black Accents
20" Multi-Dimensional Polished Aluminum
20" High-Gloss Black Painted Aluminum Wheels
17" Painted Steel
17" Painted Steel with Chrome Overlay
17" Forged Polished Aluminum
SIERRA HD
ACCESSORY WHEELS
20" Machined Aluminum Bolt Pattern with High-Gloss Black Accents — Dealer Installed
20" High-Gloss Black Painted — Dealer Installed
20" High-Gloss Black Aluminum Wheels with Machined Accents — Dealer Installed
20" Multi-Dimensional Chrome Aluminum Wheels — Dealer Installed
20" Chrome Aluminum — Dealer Installed
Due to current supply-chain shortages, certain features shown have limited or late availability, or are no longer available. See the window label or a dealer regarding the features on an individual vehicle.
