2020 GMC Sierra 2500HD AT4 Duramax 6.6L V8 Turbodiesel Carbon Black Metallic Certified. GMC Certified Pre-Owned Details: * 172 Point Inspection * Limited Warranty: 12 Month/12,000 Mile (whichever comes first) from certified purchase date * Roadside Assistance * Powertrain... via EveryCarListed.com