The exciting new Sierra HD Denali Black Diamond Edition (available in 2500 and 3500 single rear-wheel models) builds on Denali’s bold presence by adding an exclusive combination of style and capability. The Denali Black Diamond Edition features include:

  • Ebony Twilight Metallic exterior paint,1 unique 20” high-gloss black painted aluminum wheels and a power sunroof combine to set the Black Diamond Edition apart from the crowd.
  • Power-retractable assist steps with LED perimeter lighting add subtle sophistication.
  • A 6.6L Duramax® turbo diesel V8 combined with an Allison® 10-speed automatic transmission, provides impressive power and capability.
  • The MultiPro™ Audio System by KICKER®2 is perfectly designed to integrate into the MultiPro Tailgate and entertain you and your friends.
  • An auxiliary trailer camera3 — part of the available class-leading up-to-15 camera views4 — enables the available transparent trailer view and combines with trailer tire pressure monitor sensors,5 to add to the feeling of being confidently in control.
  • Premium all-weather floor liners with removable carpet inserts.

iN-Command Smart Trailer
Take control with confidence and ease


The innovative Smart Trailer feature — available on all next-generation Sierra Heavy Duty models — allows owners to easily interact with a properly equipped RV’s smart-home technology from their GMC’s infotainment screen or with a compatible smartphone via the myGMC app. Integrated to work with RVs featuring ASA Electronics’ iN-Command® Control Systems with Global Connect®,6 this convenient technology allows owners to remotely prep a water heater for a shower or set the air conditioner to cool the RV. All of this can be done while they’re on the road or around the campsite. They can also monitor key RV systems in real time.7

Read more and Experience iN-Command

1.Additional charge; premium paint. 2. Non-GM warranty. Limited warranty by KICKER®; 3 years/30,000 miles, whichever comes first. For more information, contact your dealer. 3. Not compatible with all trailers. See your dealer for details. 4. Read the Owner’s Manual for important feature limitations and information. Some camera views require available accessory camera and installation. Not compatible with all trailers. See your dealer for details. 5. Available on properly equipped vehicles. Required customer or third-party installation. Does not monitor spare tire. Mobile app feature requires paid plan. 6. iN-Command® is provided by ASA Electronics and is designed to operate within 30 feet of the trailer. Works with trailers equipped with iN-Command Control Systems with Global Connect™ via Bluetooth® connection. Control and monitoring functionality vary by trailer manufacturer, model and installed options. Use of iN-Command Control Systems feature through the myGMC app requires an active service plan. User terms apply. See for details and limitations. 7. Actual iN-Command functionality may vary with the smart trailer integration.