Take one look inside the new 2015 GMC Sierra 3500 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 seating of the 2015 Sierra 3500 Denali heavy duty pickup truck


Sierra 3500 Denali HD’s cabin is engineered to provide you and your passengers with a noticeably quiet interior. Features that help reduce cabin noise include:


  • New inlaid door design
  • Triple door seals which block outside noise
  • Hydraulic powertrain and body mounts
Sierra 3500 Denali HD interior brings comfort, refinement, and convenience to a whole new level.


Detailed craftsmanship, driver-centric design, and quality appointments make the new Sierra 3500 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
2015 GMC Sierra 3500 Denali HD and you’ll see clearly why this is the new standard in truck interiors


From the exceptional storage space in the center console to comfort and convenience features, Sierra 3500 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
  • Standard heated steering wheel and heated and cooled front seating
  • 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
  • Standard tilt and telescopic steering column


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 3500 Denali HD is clearly a respected leader in the truck market — by example.

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The available spray-in liner protects the bed of your 2015 Sierra 3500HD Denali heavy duty luxury pickup truck


The 2015 GMC Sierra 3500 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
  • Available 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
2015 Sierra 3500 Denali heavy duty pickup truck with available spray-in bedliner


With our high-performance bedliner, you can keep your Sierra 3500 Denali HD looking just as good outside as it does inside. 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
  • Denali logo on front bedwall
2015 Sierra 3500HD Denali heavy duty luxury pickup truck with signature Denali grille and accents


It’s the little things that set the new Sierra 3500 Denali HD apart, taking Denali style to an unparalleled level of refinement. It features design details such as:


  • Projector headlamps
  • LED signature front lighting (SLT and Denali)
  • Chrome grille surround
  • Wheel arch moldings
  • Rear wheelhouse liners (SRW)
  • Chrome door handles, belt and body side moldings
  • Standard 6” chrome assist steps
  • Body color front and rear bumpers


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


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The 2015 Sierra 3500 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 3500 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 3500 Denali HD, elevates the connectivity of your Sierra Denali with an available Wi-Fi hotspot for a reliable connection that doesn’t drain your phone. 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 3500 Denali HD, with navigation13 and 8″ diagonal Color Touch Radio with 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 3500 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 3500 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 -40ºF. It operates at nearly 30,000 psi to turn heavy diesel fuel into a fine mist, delivering low emissions and great power.


Sierra 3500 Denali HD delivers a smooth 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 a standard 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.


We engineered the new Sierra 3500 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 3500 Denali HD:


  • Maximum conventional trailering capacity of 19,600 lbs9
  • Maximum fifth-wheel trailering capacity of 23,200 lbs9
  • Maximum payload of 7,180 lbs10


Sierra 3500 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
  • 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 3500 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 certain 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 3500 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 3500 Denali HD’s available state-of-the-art safety and driver alert technologies offer peace of mind and help prepare you for the unexpected.

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Sierra 3500 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


Standard on Sierra  Denali models is a 6-month trial subscription to the OnStar11 Directions & Connections Plan. The plan includes:


  • Automatic Crash Response
  • Turn-by-Turn Navigation12
  • 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 3500 Denali HD. Pro Grade Protection maintains the superior performance of your Sierra, with:


  • 2 years/24,000 miles of scheduled maintenance13 (includes DEF for diesel)
  • 3-year/36,000-mile Bumper-to- Bumper Warranty14
  • 5-year/100,000-mile Powertrain Warranty14
  • 5-Year/100,000-mile Roadside Assistance & Courtesy Transportation service11
  • 6 month trial of OnStar Guidance Plan11
  • 5-year OnStar Basic Plan15
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