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  • MSRP1 starting at
    Max Seating3:
    Max Towing4:
    13000 lbs
    Max GVWR*:
    10000 lbs

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2015 GMC Sierra 3500HD/Denali

Heavy-duty trucks come with heavy-duty expectations, and the new 2015 Sierra 3500HD is here to exceed them. From its bold new exterior to its updated and modern interior, Sierra 3500HD maintains the GMC standard of design and technology, while the heavy-duty power, torque, and towing capacity of Sierra 3500HD raise the standards of performance.

NEW FOR 2015

  • Max. conventional trailering capacity (SRW) of 13,000 lbs4
  • Max. conventional trailering capacity (DRW) of 18,000 lbs4 – Max payload of 7,222 lbs5
  • Fully boxed frame
  • Box capability
  • Advanced engine cooling
  • Quiet interior with all-day comfort
  • Integrated trailer brake controller, StabiliTrak, and diesel exhaust brake for confident towing
  • 2-year/24,000-mile scheduled maintenance6 (includes DEF)


Features based on 3500HD 1WT model unless otherwise noted.

Safety and Security

  • Frontal air bags7
  • StabiliTrak stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and Hill Start Assist
  • Tire Pressure Monitoring System8 (vehicles under 10,001-lb. GVWR9)


  • Reclining front 40/20/40 split-bench seat; vinyl or cloth
  • Driver Information Center with 3.5" diagonal monochromatic display
  • Cruise control
  • Air conditioning
  • Power door locks
  • Power windows (Double and Crew cabs)
  • Audio system includes 4.2" diagonal Color Display and AM/FM stereo with USB ports10, auxiliary jack, and SD card slot
  • Trailer brake controller, integrated

Engine availability

  • Vortec 6.0L V8 with up to 360 horsepower and E85 FlexFuel11 capability on pickup models
  • Duramax 6.6L V8 Turbo Diesel with 397 horsepower, 765 lb-ft of torque; B20-Diesel compatible
  • 6.0L V8 SFI Gaseous CNG (Compressed Natural Gas), with hardened valves and valve seats (single rear wheel only)


  • 6-speed automatic, heavy-duty, electronically controlled transmission with overdrive and Tow/Haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking
  • 4-wheel disc antilock brake system
  • Heavy-duty battery with rundown protection and retained accessory power
  • External auxiliary transmission oil cooler
  • External engine oil cooler


  • Intermittent windshield wipers
  • Foldaway rearview mirrors
  • All-season tires
  • Pickup box; wide side with top tailgate and bed rail protection caps
  • Front frame-mounted recovery hooks
  • CornerStep, rear bumper
  • Cargo area lamps; cab mounted with switch on center switch bank
  • Cargo tie downs (4), movable upper
  • Spare tire lock



Options are available on certain models only. See your Ordering Guide for details.

  • Thorax side-impact airbags, driver and front passenger, and head curtain side-impact, front and rear outboard seating positions7
  • Cloth or leather seating surfaces
  • Three audio system options up to/including 8" diagonal Color Touch Screen Navigation12 with IntelliLink13, AM/FM/SiriusXM14 (with 3-month trial), USB ports10, auxiliary jack, SD card slot, Bluetooth15, Bose® sound system
  • OnStar® 6-month Directions & Connections Plan16 with Turn-by-Turn Navigation
  • Rear-Vision Camera System with dynamic grid lines
  • Bi-Fuel Compressed Natural Gas CNG fuel system; operates on both gasoline and CNG: Not E85 compatible. (single rear wheel only)
  • Allison® 1000 6-speed automatic transmission (with Duramax)
  • Upfitter switches – 4
  • LED lighting in cargo box with switch on center switch bank
  • Automatic locking rear differential
  • Outside mirror options: camper, power, heated, curb-tilt
  • Driver Alert Package includes Lane Departure Warning, Forward Collision Alert, Safety Alert Driver Seat, and Front and Rear Park Assist
  • 110-volt AC power outlet
  • EZ-Lift and Lower Tailgate
  • Ultrasonic Rear Parking Assist
  • Snow Plow Prep Package
  • Pickup Box Delete
  • Spray-in Bedliner