The 2021 GMC Sierra 2500HD Denali with Denali Ultimate Package is a heavy-duty luxury truck that combines serious towing capability with high-end comfort and advanced technology. It comes standard with a 6.6-liter V8 gas engine producing 401 horsepower and 464 lb-ft of torque, paired with a 6-speed automatic transmission and 4WD, while an available 6.6-liter Duramax turbo-diesel V8 offers even greater torque for heavy-duty tasks. It delivers up to 18,500 pounds of towing capacity and over 3,700 pounds of payload, making it highly capable for work, hauling, and towing needs.

The Denali Ultimate Package takes the already premium Denali trim to another level by adding features like a power sunroof, Technology Package, head-up display, premium floor liners, and advanced trailering technology. Inside, the cabin features premium leather seating, heated and ventilated front seats, real wood trim, Bose premium audio, navigation, and a large touchscreen infotainment system. Additional highlights include the MultiPro tailgate, available power-retractable assist steps, and enhanced camera systems, making it both luxurious and functional.

Owners and reviewers appreciate the Sierra 2500HD Denali Ultimate for its blend of rugged capability and upscale comfort, noting that it feels more like a luxury SUV inside while still performing like a true heavy-duty truck. Some mention that ride quality can be firm when unloaded and fuel economy is typical for the segment, especially with the gas engine. Overall, the 2021 Sierra 2500HD Denali Ultimate stands out as a top-tier HD truck that delivers both premium features and serious work-ready performance.

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Sales price does not include tax, title, licensing. While we make every effort to ensure the data listed here is correct, there may be instances where some of the options or vehicle features may be listed incorrectly as we get data from multiple sources. Please make sure to confirm the details of this vehicle with the dealer to ensure accuracy. Dealer cannot be held liable for data that is listed incorrectly. See Dealer for details.

Options:

Navigation System

Denali Ultimate Package

Driver Alert Package I

Driver Alert Package II

GMC Protection Package (LPO)

Preferred Equipment Group 5SA

Technology Package

X31 Off-Road Package

7 Speakers

AM/FM radio: SiriusXM with 360L

Bose Premium 7 Speaker Sound System

HD Radio

Premium audio system: Premium GMC Infotainment System

Radio: Premium GMC Infotainment Sys w/Navigation

SiriusXM w/360L

Steering Wheel Audio Controls

Air Conditioning

Automatic temperature control

Electric Rear-Window Defogger

Front dual zone A/C

Rear window defroster

12-Volt Rear Auxiliary Power Outlet

120-Volt Bed Mounted Power Outlet

120-Volt Instrument Panel Power Outlet

Driver Memory

Memory seat

Power driver seat

Power steering

Power windows

Power Windows w/Driver Express Up/Down

Remote keyless entry

Remote Vehicle Starter System

Steering wheel mounted audio controls

Universal Home Remote

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

Electrical Lock Control Steering Column

Front anti-roll bar

Front wheel independent suspension

Keyless Open & Start

Low tire pressure warning

Occupant sensing airbag

Overhead airbag

Power Door Locks

Power Sunroof

Pickup Box

Brake assist

Electronic Stability Control

Lane Departure Warning System

Exterior Parking Camera Rear

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

220 Amps Alternator

Engine Block Heater

Exhaust Brake

Heavy-Duty 80 Amp Battery

6" Rectangular Chromed Tubular Assist Steps

Auto-dimming door mirrors

Black Front & Rear Molded Splash Guards (LPO)

Bumpers: body-color

Front License Plate Kit

Heated door mirrors

IntelliBeam Automatic High Beam On/Off

LED Cargo Area Lighting

LED Smoked Amber Roof Marker Lamps

Polished Exhaust Tip

Power door mirrors

Rear step bumper

Rear Wheelhouse Liners

Signature Denali Grille

Spray-On Pickup Box Bed Liner w/Denali Logo

Turn signal indicator mirrors

Winter Grille Cover

1st & 2nd Row All-Weather Floor Liner (LPO)

2 USB Ports

2 USB Ports (1st Row)

2nd Row Dual USB Charge-Only Ports

4G LTE Wi-Fi Hotspot Capable

Apple CarPlay/Android Auto

Auto-dimming Rear-View mirror

Automatic Emergency Braking

Bed View Camera w/2 Trailer Camera Provisions

Compass

Compass Located In Instrument Cluster

Driver door bin

Driver vanity mirror

Floor-Mounted Center Console

Following Distance Indicator

Forward Collision Alert

Front reading lights

Garage door transmitter

Genuine wood console insert

Genuine wood door panel insert

GMC Connected Access Capable

HD Surround Vision

Heated steering wheel

Illuminated entry

Inside Rearview Auto-Dimming Rear Camera Mirror

Lane Change Alert w/Side Blind Zone Alert

Multicolor 15" Diagonal Head-Up Display

OnStar & GMC Connected Services Capable

Outside temperature display

Overhead console

Passenger vanity mirror

Rear Cross Traffic Alert

Rear reading lights

Rear seat center armrest

Tachometer

Telescoping steering wheel

Tilt steering wheel

Trip computer

Ultrasonic Front & Rear Park Assist

Voltmeter

Wireless Charging

Wireless Phone Projection

10-Way Power Driver Seat Adjuster w/Lumbar

10-Way Power Passenger Seat Adjuster w/Lumbar

Forge Perforated Leather-Appointed Front Seat Trim

Front Bucket Seats

Front Center Armrest

Heated & Ventilated Front Bucket Seats

Heated 2nd Row Outboard Seats

Heated Driver & Front Outboard Passenger Seats

Heated front seats

Heated rear seats

Power passenger seat

Safety Alert Seat

Split folding rear seat

Ventilated front seats

Passenger door bin

Chrome Recovery Hooks

Hitch Guidance w/Hitch View

In-Vehicle Trailering System App

Integrated Trailer Brake Controller

Alloy wheels

Wheels: 20" Multi-Dimensional Polished Aluminum

Deep-Tinted Glass

Power Front Passenger Windows w/Express Up/Down

Power Rear Windows w/Express Down

Power Sliding Rear Window w/Defogger

Variably intermittent wipers