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2025 GMC Sierra HD Denali OVERVIEW

2025 GMC Sierra HD Denali in Alton

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20" Ultra-Bright machined wheels with bright chrome inserts*
Denali-exclusive authentic open-pore wood, patterned aluminum trim and forge perforated leather seating surfaces
12-way heated and ventilated power front seats
StabiliTrak, electronic stability control system with traction control

2025 GMC Sierra HD Denali MODELS

Sierra HD Denali
Sierra HD Denali Ultimate

GMC Sierra HD Denali Dealer in Alton

2025 GMC Sierra HD Denali PERFORMANCE

6.6L V8 GAS ENGINE

Sierra HD Denali’s standard 6.6L V8 gas engine is paired with the Allison 10-speed automatic transmission, to help optimize power, torque and efficiency.

ADAPTIVE CRUISE CONTROL* WITH TRAILERING*

This feature allows the luxury heavy-duty truck’s Adaptive Cruise Control to account for additional drag and increased braking distances when towing a trailer.

PROGRADE® TRAILERING TECH

This advanced suite of available intelligent technologies helps streamline the hitching and towing process with integrated tools that help enhance your sense of confidence and visibility.

2025 GMC Sierra HD Denali APPEARANCE

BOLD DENALI GRILLE

Stand out everywhere you go with Sierra HD Denali’s signature chrome grille, front bumper and exterior design.

20" DENALI WHEELS

Sierra HD Denali stands out with 20" Ultra-Bright machined wheels with bright chrome inserts.*

SPRAY-ON BEDLINER

Help protect the bed and enhance its style with durable cargo bed protection featuring a GMC logo.

2025 GMC Sierra HD Denali COMFORT

PREMIUM DENALI INTERIOR

Sierra HD Denali’s interior distinguishes itself with aluminum trim, chrome accents, embroidered Denali logo and authentic open-pore walnut wood detailing.

16-WAY POWER FRONT SEATS

Experience serious comfort in Sierra HD Denali Ultimate’s best-in-class* 16-way power front seats with massaging feature.

12.3" DIAGONAL COLOR DRIVER INFORMATION CENTER

Control and customize important vehicle, driving and infotainment content in high-resolution clarity.

12-SPEAKER BOSE SOUND SYSTEM

The technologically advanced available 12-speaker Bose* Premium Series with Centerpoint* surround sound helps create a concert-like listening experience.

2025 GMC Sierra HD Denali SAFETY & WARRANTY

PRO GRADE PROTECTION

Standard on every new GMC - GMC Pro Grade Protection has you truly protected with features and services including:

3-year / 36,000-mile Bumper-to-Bumper Limited Warranty
5-year / 60,000-mile Powertrain Limited Warranty
5-year / 60,000-mile Roadside Assistance & Courtesy Transportation
3-year / 36,000-mile Corrosion Protection
6-year / 100,000-mile Rust-Through Protection
First maintenance visit

2025 GMC Sierra HD Denali Safety Main Img

REAR CAMERA MIRROR

Rear Camera Mirror uses a camera to provide you a wide and less obstructed view behind the vehicle while you’re driving. You can switch between the camera view and a traditional rear-view mirror.

FOLLOWING DISTANCE INDICATOR

Following Distance Indicator displays the gap time in seconds between your vehicle and a detected vehicle you’re following. This can help you decide if you’re following much too closely.

LANE CHANGE ALERT WITH SIDE BLIND ZONE ALERT*

Lane Change Alert with Side Blind Zone Alert can provide side-mirror visual alerts when a detected moving vehicle is quickly approaching or is in your side blind zone. It can help you avoid lane change collisions.

Check Out Our Inventory

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2025 GMC Sierra HD Denali OVERVIEW

2025 GMC Sierra HD Denali in Alton

2025 GMC Sierra HD Denali MODELS

Sierra HD Denali

Sierra HD Denali Ultimate

GMC Sierra HD Denali Dealer in Alton

2025 GMC Sierra HD Denali PERFORMANCE

6.6L V8 GAS ENGINE

ADAPTIVE CRUISE CONTROL* WITH TRAILERING*

PROGRADE® TRAILERING TECH

2025 GMC Sierra HD Denali APPEARANCE

BOLD DENALI GRILLE

20" DENALI WHEELS

SPRAY-ON BEDLINER

2025 GMC Sierra HD Denali COMFORT

PREMIUM DENALI INTERIOR

16-WAY POWER FRONT SEATS

12.3" DIAGONAL COLOR DRIVER INFORMATION CENTER

12-SPEAKER BOSE SOUND SYSTEM

2025 GMC Sierra HD Denali SAFETY & WARRANTY

PRO GRADE PROTECTION

REAR CAMERA MIRROR

FOLLOWING DISTANCE INDICATOR

LANE CHANGE ALERT WITH SIDE BLIND ZONE ALERT*

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