Certified. Onyx Black 2025 GMC Sierra 3500HD Denali 4WD 10-Speed Automatic Duramax 6.6L V8 Turbodiesel 10-Speed Automatic, 4WD, Black Leather. Call us directly at 1-844-695-6060! Delivery available upon request! Odometer is 20352 miles below market average! GMC Certified Pre-Owned Details: * 24 months/24,000 miles (whichever comes first) Certified Pre-Owned Scheduled Maintenance Plan and 3 days/150 miles (whichever comes first) Vehicle Exchange Program. SiriusXM 3-month trial subscription * Roadside Assistance * Warranty Deductible: $0 * Powertrain Limited Warranty: 72 Month/100,000 Mile (whichever comes first) from original in-service date * 172 Point Inspection * Limited Warranty: 12 Month/12,000 Mile (whichever comes first) from certified purchase date * Transferable Warranty * Vehicle History WE PUT CUSTOMERS FIRST!