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Standard on every new 2018 GMC Sierra Denali HD, GMC Pro Grade Protection has you truly protected with features and services including:

  • Two maintenance visits.2
  • 3-year/36,000-mile Bumper-to-Bumper Limited Warranty.3
  • 5-year/60,000-mile Powertrain Limited.3
  • 5-year/60,000-mile Roadside Assistance and Courtesy Transportation.3
  • 3-month limited service trial of OnStar1 Guidance Plan.
  • 5-year OnStar Basic Plan.4  

1. Guidance Plan trial does not include calling minutes. Services vary by device, model and conditions. OnStar acts as a link to existing emergency service providers. Visit for vehicle availability, coverage map, details and system limitations.
2. Maintenance visits must occur within two years or 24,000 miles of vehicle delivery, whichever comes first. Does not include air filters. See participating dealer for other restrictions and complete details.
3. Whichever comes first. See dealer for limited-warranty details.
4. Does not include emergency or security services. Visit for coverage map, details and system limitations.