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1620 East Homer Adams Pkwy Alton, IL 62002

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2015 GMC Sierra 2500HD Denali OVERVIEW Overview Icon

2015 GMC Sierra 2500HD Denali in Alton

Take one look inside the new 2015 GMC Sierra 2500 Denali HD and you’ll see clearly why this is the new standard in truck interiors. Sierra’s interior brings comfort, refinement and convenience to a whole new level.

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  • Front full-feature leather-appointed bucket seats
  • Heated and cooled front row seating
  • Power-adjustable pedals
  • Dual-zone automatic climate control air conditioning
  • Bose® sound system
  • Rear Vision Camera
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GMC Sierra 2500HD Denali Dealer in Alton

2015 GMC Sierra 2500HD Denali PERFORMANCE Performance Icon

2015 GMC Sierra 2500HD Denali performance

DURAMAX DIESEL 6.6L V8 TURBO

The advanced DURAMAX diesel in the Sierra 2500 Denali HD delivers 397 hp and 765 lb-ft of torque, making it the most powerful Sierra ever. The DURAMAX Diesel engine has a strong reputation and a proven track record with nearly 1.4 million sold since 2000. Paired with the sophisticated Allison® 1000 Series Transmission with overdrive, this available powertrain also offers a maximum highway range of up to 680 miles on a single fill-up.

2015 GMC Sierra 2500HD Denali performance

DURALIFE™ BRAKE ROTORS

This ferritic nitrocarburizing technology is a GM-exclusive patented process that hardens and strengthens brakes. Duralife® protects against corrosion and can double the life of the brakes compared to conventional rotors.

2015 GMC Sierra 2500HD Denali performance

ALLISON 1000 SERIES TRANSMISSION

The enhanced Allison 1000 is designed to handle the higher torque capability of the 6.6L DURAMAX engine, while also helping improve fuel economy and provide seamless assistance with the exhaust brake system.

2015 GMC Sierra 2500HD Denali performance

SUSPENSION

Sierra 2500 Denali HD delivers a smoother ride with a fully independent coil-over-shock front suspension and 3″-wide multistage rear leaf springs, which engage progressively as the load in the bed or the hitch increases.

2015 GMC Sierra 2500HD Denali APPEARANCE Appearance Icon

CARGO BOX INNOVATION SPRAY-ON BEDLINER ATTENTION TO DETAIL 2015 GMC Sierra 2500HD Denali Appearance Main Img
2015 GMC Sierra 2500HD Denali appearance

UNMATCHED CARGO BOX INNOVATION

The 2015 GMC Sierra 2500 Denali HD shows how our “Never Say Never” approach to engineering can transform working harder into working smarter.

2015 GMC Sierra 2500HD Denali appearance

STANDARD SPRAY-ON BEDLINER

Keep your Sierra 2500 Denali HD looking just as good outside as it does in with our high-performance bedliner. It helps to protect your truck bed from scratches, dents, and corrosion by providing it with a durable, watertight seal.

2015 GMC Sierra 2500HD Denali appearance

ATTENTION TO DETAIL

It’s the little things that set the new Sierra 2500 Denali HD apart, taking Denali style to an unparalleled level of refinement.

2015 GMC Sierra 2500HD Denali COMFORT Comfort Icon

2015 GMC Sierra 2500HD Denali comfort

A NEW STANDARD OF QUIET

Sierra 2500 Denali HD’s cabin is engineered to provide you and your passengers with a noticeably quiet interior.

2015 GMC Sierra 2500HD Denali comfort

CRAFTSMANSHIP

Detailed craftsmanship, driver-centric design, and quality appointments make the new Sierra 2500 Denali HD a cut above other trucks.

2015 GMC Sierra 2500HD Denali comfort

COMFORT & CONVENIENCE

From the exceptional storage space in the center console, to comfort and convenience features, Sierra 2500 Denali HD is designed to give you the comfort you deserve and the flexible functionality you need.

2015 GMC Sierra 2500HD Denali comfort

DENALI CUSTOMIZABLE DRIVER DISPLAY

The 2015 Sierra 2500 Denali HD puts absolute control at your fingertips. The standard reconfigurable 8″ diagonal display in the instrument cluster provides an intuitive way to customize your vehicle information and media displays.

2015 GMC Sierra 2500HD Denali SAFETY & WARRANTY Safety Icon

PRO GRADE PROTECTION

  • 3-year / 36,000-mile Bumper-to-Bumper Limited Warranty
  • 5-year / 100,000-mile Powertrain Limited Warranty
  • 3-year / 36,000-mile Corrosion Protection
  • 6-year / 100,000-mile Rust-Through Protection
  • 5-year / 100,000-mile Roadside Assistance
  • 2-year / 24,000-mile Maintenance
2015 GMC Sierra 2500HD Denali Safety Main Img
2015 GMC Sierra 2500HD Denali safety

SEGMENT-FIRST DRIVER ALERT TECHNOLOGIES

Sierra 2500 Denali HD’s advanced technologies pair intelligent engineering with driver-centric safety, using cameras or ultrasonic sensors to watch where you might not be looking. Sierra is the first pickup to offer this technology, which lets you know when you are approaching another vehicle too quickly or when you’ve left your driving lane.

2015 GMC Sierra 2500HD Denali safety

SAFE & CONNECTED: ONSTAR

Available on most Sierra models is a 6-month trial subscription to the OnStar12 Directions & Connections Plan. The plan includes:

- Automatic Crash Response
- Turn-by-Turn Navigation13
- Roadside Assistance

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