Take one look inside the new 2015 GMC Sierra 3500HD 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 heavy duty pickup truck


Sierra 3500HD’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 that block outside noise
  • Hydraulic powertrain and body mounts
Interior styling of the 2015 Sierra 3500 heavy duty pickup truck


Detailed craftsmanship, driver-centric design, and quality appointments make the new 2015 Sierra 3500 Denali HD a cut above other trucks. Available features include:

  • Durable, soft-touch instrument panel materials and door trim
  • Aluminum trim on instrument panel, steering wheel, and center console
  • Contrasting stitching
Convenient features of the 2015 Sierra 3500 heavy duty pickup truck


From the exceptional storage space in the center console to comfort and convenience features, Sierra 3500HD is designed to give you the comfort you deserve and the flexible functionality you need. Available 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
  • Available 110V power outlet
  • Improved rear-seat legroom (crew cabs)
  • Locking under-seat storage on SLE models with front bench seating


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 3500HD is clearly a respected leader in the truck example.

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2015 Sierra 3500 heavy duty pickup truck with standard upper tie-downs


The 2015 GMC Sierra 3500HD shows how our “Never Say Never” approach to engineering can transform working harder into working smarter. It includes innovative, 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
  • Available EZ-Lift and lower tailgate
2015 Sierra 3500 heavy duty pickup truck with available spray-in bedliner


Help protect your truck bed from scratches, dents, and corrosion with our high-performance bedliner that provides a durable, watertight seal.


  • 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
Front grille of the 2015 Sierra 3500HD heavy duty pickup truck


It’s the little things that take the new Sierra 3500HD to an unparalleled level of refinement. Sierra 3500HD features design details such as:

  • Projector headlamps
  • LED signature front lighting (SLT)
  • Chrome grille surround
  • Wheel arch moldings
  • Available rear wheelhouse liners (SRW)
  • Available chrome belt moldings


We engineered the Sierra 3500HD 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 3500HD:


  • Best-in-class maximum available conventional towing.3
  • Maximum conventional trailering capacity of 19,600 lbs4
  • Maximum fifth-wheel trailering capacity of 23,200 lbs4
  • Maximum payload of 7,180 lbs5


Sierra 3500HD 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
  • Standard 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 3500HD 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™12 Brake Rotors


Sierra HD’s available 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 new 2015 Sierra 3500HD sets a higher standard with purposeful technology — to help you stay connected and in control.

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The available 8″ diagonal Color Touch Radio with next generation IntelliLink6 lets you customize your media and connect to your world. Standard on SLE and SLT Double and Crew Cabs, features include:


  • 8” diagonal customizable color touch screen
  • Natural Language voice command
  • My Media connects media libraries from multiple devices
  • Customizable “Favorites” lets you save albums, songs, artists, destinations and contacts
  • Bluetooth connectivity7
  • Smartphone integration for hands-free calling and phone book access
  • Ability to stream Pandora® Internet Radio8


Now available on the Sierra 3500HD, OnStar® with 4G LTE™9 provides you with an available Wi-Fi hotspot anytime your vehicle is on for an integrated, customizable in-vehicle experience.


  • Supports up to 7 mobile devices to keep you and your passengers connected to work, entertainment and more.
  • Provides a more powerful connection than a smartphone or a mobile hotspot.


The available Rear Vision Camera helps to provide clarity and peace of mind while you maneuver and park your Sierra—even in the tightest of spots. It provides a view behind the vehicle, which is displayed in the radio screen.


To help avoid trouble, Sierra is the first heavy duty pickup to offer the new available Driver Alert Package, including Forward Collision Alert, Lane Departure Warning, and the Safety Alert Seat. These innovations help make you aware of the driving environment surrounding your Sierra 3500HD.


We built the Sierra 3500HD 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 3500HD 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 2000.10 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.11


This ferritic nitrocarburizing technology is a GM-exclusive patented process that hardens and strengthens brakes. Duralife®12 protects against corrosion and can double the life of the brakes compared to conventional rotors.


The enhanced Allison 1000 is strengthened 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 3500HD 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.

  • 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


The 2015 Sierra 3500HD’s available state-of-the-art safety and driver alert technologies offer peace of mind and help prepare you for the unexpected.



Sierra 3500HD’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 most Sierra models is a 6-month trial subscription to the OnStar13 Directions & Connections Plan. The plan includes:


  • Automatic Crash Response
  • Turn-by-Turn Navigation14
  • Roadside Assistance
  • Emergency Services Link
  • 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 3500HD. Pro Grade Protection maintains the superior performance of your Sierra, with:

  • 2 years/24,000 miles of scheduled maintenance15 (includes DEF for diesel).
  • 3-year/36,000-mile Bumper-to- Bumper Warranty16
  • 5-year/100,000-mile Powertrain Warranty16
  • 5-Year/100,000-mile Roadside Assistance & Courtesy Transportation16
  • 6 month trial of OnStar Guidance Plan13
  • 5-year OnStar Basic Plan17

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