Yes, its the diesel truck everyone assumes can tow a mountain and it pretty much shows up ready to prove it. The 2026 GMC Sierra 2500HD AT4 in Onyx Black delivers bold styling paired with serious heavy-duty capability. Equipped with the legendary Duramax 6.6L V8 Turbodiesel, it provides impressive torque, confident towing performance, and long-haul reliability. The AT4 trim enhances off-road readiness with rugged suspension components and purposeful design details. Inside, the cabin balances durability with modern technology and comfortable materials for everyday driving. This truck is built for drivers who need strength, versatility, and premium features in a heavy-duty pickup.

Ownership confidence is supported by the included 2-Year/24k Young Auto Group Maintenance Plan, featuring 2 years of free oil changes, free tire rotations, and free safety inspections. This maintenance coverage helps simplify routine service and maintain peak performance. Advanced safety and driver-assist technologies contribute to reassurance whether towing, traveling, or working. The 2026 GMC Sierra 2500HD AT4 is engineered for demanding tasks while remaining comfortable for daily use. Price does not include any dealer installed options or accessories, and new vehicle pricing may include rebates and manufacturer incentives for qualified buyers; see dealership for details. Tax, title, and license fees are extra. *Disclaimer: Contact dealer for details. Prices do not include additional fees and costs of closing, including government fees, taxes, any finance charges, any dealer documentation fees or any dealer installed accessories. All prices, specifications and availability subject to change without notice. Special internet prices cannot be combined with any other promotion. *Offers and incentives shown may not be available to all customers. Incentives lists are examples of offers available at the time of posting and are subject to change and expiration. Not all incentives can be redeemed together. To take advantage of rebates, incentives and/or financing offers you must take new retail delivery from dealer stock by the expiration date noted. Not all buyers will qualify for all incentives, GM financing or other offers. Restrictions apply. See us for complete details for more information.$500 - Purchase Allowance. Exp. 03/02/2026 Must trade in 2016 or newer with 80,000 miles or less.. Branded/salvage title will not qualify. $2,000 Down Payment Assistance is available Must Finance with GM Financial - OAC. Contact Dealer For Additional Details

Options:

X31 Off-Road Package

7 Speakers

AM/FM radio: SiriusXM with 360L

Bose Premium 7-Speaker Sound System

Premium audio system: Premium GMC Infotainment System

Radio: AM/FM Stereo with Premium GMC Infotainment System

SiriusXM with 360L Trial Subscription

Steering Wheel Audio Controls

Air Conditioning

Automatic temperature control

Electric Rear-Window Defogger

Front dual zone A/C

Rear window defroster

120-Volt Bed Mounted Power Outlet

120-Volt Instrument Panel Power Outlet

Driver Memory

Memory seat

Power driver seat

Power steering

Power windows

Push Button Start

Remote keyless entry

Remote Vehicle Starter System

Steering wheel mounted audio controls

Manual Tilt-Wheel/Telescoping Steering Column

Off-Road Suspension

Speed-sensing steering

Traction control

4-Wheel Disc Brakes

ABS brakes

Dual front impact airbags

Dual front side impact airbags

Emergency communication system: OnStar

Front anti-roll bar

Front wheel independent suspension

Keyless Open and Start

Low tire pressure warning

Occupant sensing airbag

Overhead airbag

Pickup Box

Brake assist

Electronic Stability Control

Lane Departure Warning System

Hill Descent Control

Auto High-beam Headlights

Delay-off headlights

Front fog lights

Fully automatic headlights

Panic alarm

Security system

Unauthorized Entry Theft-Deterrent System

Speed control

2-Speed Active Transfer Case

Heavy-Duty 80 Amp Battery

Auto-dimming door mirrors

Bumpers: body-color

Gloss Black Header Grille and Grille Insert Bars

Heated door mirrors

IntelliBeam Automatic High Beam on/Off

LED Cargo Area Lighting

Power door mirrors

Rear step bumper

Rear Wheelhouse Liners

Spray-on Pickup Bedliner with GMC Logo

Turn signal indicator mirrors

2 Charge-Only Rear USB Ports

2 Charge/Data USB Ports Inside Center Console

2 USB Ports

Apple CarPlay/Android Auto

Auto-dimming Rear-View mirror

Automatic Emergency Braking

Bed View Camera with Two Trailer Camera Provisions

Buckle to Drive

Compass

Driver door bin

Driver vanity mirror

Floor-Mounted Center Console

Following Distance Indicator

Forward Collision Alert

Front Pedestrian Braking

Front Premium Floor Liners with Removable Carpet Insert

Front reading lights

HD Surround Vision

Heated steering wheel

Illuminated entry

OnStar Services Capable

Outside temperature display

Overhead console

Passenger vanity mirror

Rear Cross Traffic Alert

Rear Premium Floor Liners with Removable Carpet Insert

Rear reading lights

Rear seat center armrest

Tachometer

Telescoping steering wheel

Tilt steering wheel

Trailer Cam Provisions and Trailer Viewing Software

Trailer Side Blind Zone Alert

Trip computer

Ultrasonic Front and Rear Park Assist

Voltmeter

Wireless Charging

Wireless Phone Projection

10-Way Power Driver Seat Adjuster with Lumbar

10-Way Power Passenger Seat Adjuster with Lumbar

Front Bucket Seats

Front Center Armrest

Heated 2nd Row Outboard Seats

Heated Driver and Front Outboard Passenger Seats

Heated front seats

Heated rear seats

Perforated Leather-Appointed Front Seat Trim

Power passenger seat

Safety Alert Seat

Split folding rear seat

Ventilated Driver and Front Passenger Seats

Ventilated front seats

Passenger door bin

Hitch Guidance with Hitch View

in-Vehicle Trailering System App

Alloy wheels

Wheels: 20" High Gloss Black 8 Spokes Aluminum

Deep-Tinted Glass

Front Rain-Sensing Wipers

Power Front Passenger Windows with Express Up/Down

Rain sensing wipers

Variably intermittent wipers

3.73 Rear Axle Ratio