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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Interior of the 2015 Sierra 2500HD Denali heavy duty luxury pickup truck


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


  • New inlaid door design
  • Triple door seals which block outside noise
  • Hydraulic powertrain and body mounts

Infotainment of the 2015 Sierra 2500 Denali heavy duty pickup truck


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


  • Durable, soft-touch instrument panel materials and door trim
  • Aluminum trim on instrument panel, steering wheel, and center console
  • Contrasting stitching
  • Denali-exclusive perforated leather-appointed seating with unique Denali identification

Steering wheel and dashboard of the 2015 Sierra 2500 Denali heavy duty pickup truck


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. Features include:


  • A center console big enough to store hanging file folders, laptops, and much more
  • Dual-density seat foam that holds its shape longer and keeps you comfortable
  • Larger controls that are easy to reach and read
  • USB2 ports and 12V charging outlets
  • 110V power outlet
  • Improved rear seat leg room on crew cab models
  • Heated and cooled front seats
  • Heated steering wheel


Nearly two-thirds of the Sierra cab structure is made from high-strength steels. It’s a fortress of strength that contributes to the Sierra’s quiet cabin. We also use high-strength steel in our fully-boxed frame rails and major frame cross-members, the 2015 Sierra 2500 Denali HD is clearly a respected leader in the truck market — by example.

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Protect the bed of your 2015 Sierra 2500HD Denali heavy duty luxury pickup truck with available spray-in bedliner


The 2015 GMC Sierra 2500 Denali HD shows how our “Never Say Never” approach to engineering can transform working harder into working smarter. It includes intuitive features, such as:


  • Integrated rear bumper corner steps for easy access to the box
  • A roll-formed pick-up box bed that is stronger, lighter, and more durable than a traditional stamped steel bed
  • Four upper tie-downs help you manage cargo of many shapes and sizes
  • LED box lighting to help you see inside when a tonneau cover is installed or when a flashlight isn’t handy
  • EZ-Lift and lower tailgate
Available spray-in bedliner protects the bed of your 2015 Sierra 2500HD Denali heavy duty luxury pickup truck


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 that:


  • Utilizes a textured, non-skid, anti-corrosive surface
  • Covers bed surfaces below the bed rails 
  • Helps to extend the life of both your equipment and your truck


2015 Sierra 2500HD Denali heavy duty luxury pickup truck with signature Denali grille and accents


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

  • Projector headlamps
  • LED signature front lighting
  • Signature Denali grille
  • Available 20″ polished aluminum wheels
  • Wheel arch moldings
  • Rear wheelhouse liners
  • Chrome belt moldings
  • Body color front and rear bumpers
  • Chrome mirror caps and door handles


The new 2015 Sierra HD sets a higher standard with purposeful technology — to help you stay connected and in control.


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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.


The 2015 Sierra 2500 Denali HD lets you set your information your way, and delivers the data you need at a glance. Choose from a menu of display options to customize what you see and how you see it.


OnStar® with 4G LTE,™5 now available on the Sierra 2500 Denali HD, provides you with an available Wi-Fi hotspot anytime your vehicle is on for integrated, in-vehicle Internet connectivity. Offering support for up to 7 mobile devices, it provides a more powerful connection than a smartphone or a mobile hotspot to keep you and your passengers connected to work, entertainment and more.


Standard on the Sierra 2500 Denali HD, the 8″ diagonal Color Touch Radio with navigation12 and next generation IntelliLink3 lets you customize your media and connect to your world. Features include Natural Language voice command, hands-free calling and Bluetooth® connectivity.4


We built the Sierra 2500 Denali HD to deliver everything you expect from a heavy-duty truck — and then we exceeded those expectations with the most powerful Sierra ever.

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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 2000.6 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.7


This ferritic nitrocarburizing technology is a GM-exclusive patented process that hardens and strengthens brakes. Duralife®8 protects against corrosion and can double the life of the brakes compared to conventional rotors.


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.


For fast starts in cold weather, quiet operation and maximum efficiency, the direct injection system helps Sierra HD with the available Duramax Diesel engine start in as little as 3 seconds at -40ºC and operates at nearly 30,000 psi to turn heavy diesel fuel into a fine mist, delivering low emissions and great power.


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.


From strong, steady power to bold acceleration on the highway, the 6.0L V8 with Variable Valve Timing (VVT) is up to any task by:

  • Delivering power when needed and efficiency when less power is called for
  • Monitoring and opening and closing valves for near peak levels of torque across the entire range of engine speeds


No other competitor in its class offers an available fully automatic locking rear differential for on- or off-road use.

  • Delivers added traction in driving and wheel-slip situations
  • Senses a difference in speed between left and right rear wheels, and then locks to turn both wheels in unison


Stay confidently in command of your truck and whatever you may be hauling or trailering.

  • Available Hill Descent Control allows for a controlled descent in rough terrain without use of the brake pedal
  • StabiliTrak intelligently manages braking and throttle to help keep the vehicle on its intended path
  • Automatic Locking Rear Differential delivers increased traction
  • Driver Shift Control lets you shift gears up and down with the tap of the shift selector


We engineered the new Sierra 2500 Denali HD to exceed your performance expectations, pushing it to the limit to deliver the kind of capability you demand.

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Trailer confidently with Sierra 2500 Denali HD:


  • Best-in-class 3/4-ton maximum available payload9
  • Maximum conventional trailering capacity of 14,500 lbs10
  • Maximum fifth-wheel trailering capacity of 17,900 lbs10
  • Maximum payload of 3,560 lbs11


Sierra 2500 Denali HD puts trailer safety and control at your fingertips.


  • An available Integrated Trailer Brake Controller located close to the steering wheel for easy adjustments and displays the level of brake force or “gain” in the Driver Information Center
  • Trailer Sway Control Technology keeps both you and your trailer heading in the proper direction, automatically using sensors to detect the rocking of a swaying trailer, and then applying the brakes to help bring it back in line


To let you engage an extra measure of braking confidence on long grades, or in tow/haul mode, Sierra 2500 Denali HD utilizes various technologies to ensure that you stay at the desired speeds:


  • The Duramax diesel exhaust brake uses engine compression to create “negative torque” to help slow the vehicle
  • Grade Braking automatically senses when you want to slow down, and when the conditions are met, engages a Grade Braking shift schedule to help you maintain your desired speed
  • 4-wheel disc brakes with DURALIFE™8 Brake Rotors


The 2500 Denali HD’s standard Trailering Package gives you the capability to trailer just about anything. The package includes:


  • Trailering hitch platform
  • 2.5″ receiver with 2″ adapter
  • 7- and 4-pin connectors
  • Trailering mirrors with daytime running lamps and lights to aid visibility when reversing 
  • A rear-vision camera view that makes it easier to reverse and negotiate tight spaces while trailering


The 2015 Sierra 2500 Denali HD’s state-of-the-art safety and driver alert technologies provide peace of mind and help prepare you for the unexpected.

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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. Available technologies include:


  • Forward Collision Alert
  • Lane Departure Warning
  • Safety Alert Seat



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
  • Emergency Services
  • Remote Door Unlock

GMC Safety Message

Your safety is very important to us. If you want to determine whether or not there is a recall on your current vehicle or on a vehicle you are considering, visit or call (888) 327-4236.


The industry's best pickup coverage comes standard on the Sierra 2500 Denali HD. Pro Grade Protection maintains the superior performance of your Sierra, with:


  • 2 years/24,000 miles of scheduled maintenance14 (includes DEF for diesel)
  • 3-year/36,000-mile Bumper-to- Bumper Warranty15
  • 5-year/100,000-mile Powertrain Warranty15
  • 5-Year/100,000-Mile Roadside Assistance & Courtesy Transportation15
  • 6 month trial of OnStar Guidance Plan12
  • 5-year OnStar Basic Plan16
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