This 2021 GMC Sierra 1500 AT4 delivers the capability and comfort you need, backed by a proven 3.0L I6 diesel engine paired with a 10-speed automatic transmission and 4WD. Whether you're managing daily responsibilities or tackling weekend adventures, this truck combines practical power with refined features that make every drive more enjoyable. - 3.0L Duramax I6 Diesel Turbocharged with 277 hp and 460 lb-ft of torque - Technology Package with HD Surround Vision, Rear Camera Mirror, Bed View Camera, and 15" Multicolor Head-Up Display - Driver Alert Package II with Automatic Emergency Braking, Lane Keep Assist, and Adaptive Cruise Control - Power Sunroof - Premium Bose 7-Speaker Sound System with Navigation - SiriusXM with 360L - Leather seating with heated and ventilated front seats - ProGrade Trailering System with Integrated Trailer Brake Controller - Spray-On Pickup Bed Liner with AT4 Logo - Wireless Charging and Apple CarPlay/Android Auto compatibility - 4G LTE Wi-Fi Hotspot Capable - Console-Mounted Safe (dealer-installed) - Off-Road Suspension with Hill Descent Control - Ultrasonic Front and Rear Park Assist This truck has earned its certification through a comprehensive evaluation process. Our service team conducted a rigorous inspection, verifying that this Sierra meets our high standards for quality and performance. With accident-free CARFAX history and a balance of factory warranty remaining, you can drive with confidence knowing this vehicle has been professionally assessed and approved. The AT4 trim combines rugged capability with premium amenities. The heated steering wheel, keyless open and start, and power sliding rear window demonstrate thoughtful engineering. Remote vehicle starter and universal home remote add convenience to your daily routine. The available Hitch Guidance with Hitch View and in-vehicle trailering app make towing intuitive, while red recovery hooks and the heavy-duty air filter support serious work. City driving returns 22 mpg, while highway stretches deliver 26 mpg, giving you reasonable efficiency for a diesel-powered truck of this class. The 3.23 rear axle ratio balances performance and fuel economy for varied driving conditions. Every detail reflects GMC's commitment to the AT4 experience. From the body-color surround grille and perimeter lighting to the rear wheelhouse liners and color-keyed carpet, this truck presents a cohesive, professional appearance. The 8" digital driver information center, compass, and trip computer keep you informed, while the 10-way power seat adjusters with lumbar support ensure comfort during long drives. We invite you to experience this 2021 GMC Sierra 1500 AT4 in person. Our team is ready to discuss financing options and answer your questions about this well-equipped truck. Schedule your visit today and discover why this certified vehicle is the right choice for your needs.

Additional Information

AT4 Preferred Package,AT4 Value Package,Driver Alert Package I,Driver Alert Package II,Preferred Equipment Group 4SB,Technology Package,Trailering Package,6 Speakers,6-Speaker Audio System Feature,AM/FM radio: SiriusXM with 360L,Premium audio system: GMC Infotainment System,Premium Bose 7-Speaker Sound System,Radio data system,Radio: Premium GMC Infotainment Sys w/Multi-Touch,Radio: Premium GMC Infotainment Sys w/Navigation,SiriusXM w/360L,Steering Wheel Audio Controls,Air Conditioning,Automatic temperature control,Electric Rear-Window Defogger,Front dual zone A/C,Rear window defroster,12-Volt Rear Auxiliary Power Outlet,120-Volt Bed Mounted Power Outlet,120-Volt Instrument Panel Power Outlet,Driver Memory,Memory seat,Power driver seat,Power Front Passenger Windows w/Express Up/Down,Power Front Windows w/Driver Express Up/Down,Power Rear Windows w/Express Down,Power steering,Power windows,Remote keyless entry,Remote Vehicle Starter System,Steering wheel mounted audio controls,Universal Home Remote,Auto-Locking Rear Differential,Electrical Lock Control Steering Column,Manual Tilt-Wheel & Telescoping Steering Column,Off-Road Suspension,Speed-sensing steering,Traction control,4-Wheel Disc Brakes,ABS brakes,Dual front impact airbags,Dual front side impact airbags,Front anti-roll bar,Front wheel independent suspension,Keyless Open & Start,Low tire pressure warning,Occupant sensing airbag,Overhead airbag,Power Door Locks,Power Sunroof,Brake assist,Electronic Stability Control,Hill Descent Control,Delay-off headlights,Front fog lights,Fully automatic headlights,Perimeter Lighting,Panic alarm,Security system,Theft Deterrent System (Unauthorized Entry),Adaptive Cruise Control,Speed control,170 Amp Alternator,220 Amp Alternator,Auxiliary External Transmission Oil Cooler,Engine Block Heater,Heavy-Duty Air Filter,Auto-dimming door mirrors,Body-Color Surround Grille,Bumpers: body-color,Heated door mirrors,IntelliBeam Automatic High Beam On/Off,LED Cargo Area Lighting,Power door mirrors,ProGrade Trailering System,Rear step bumper,Rear Wheelhouse Liners,Spray-On Pickup Bed Liner w/AT4 Logo,2 USB Ports,2 USB Ports (1st Row),4.2" Diagonal Color Display Driver Info Center,4G LTE Wi-Fi Hotspot Capable,8" Driver Information Center,Apple CarPlay/Android Auto,Auto-dimming Rear-View mirror,Automatic Emergency Braking,Bed View Camera,Color-Keyed Carpeting Floor Covering,Compass,Console-Mounted Safe (LPO),Driver door bin,Driver vanity mirror,Floor-Mounted Center Console,Following Distance Indicator,Forward Collision Alert,Front Pedestrian Braking,Front Prem Floor Liners w/Removable Carpet Insert,Front reading lights,GMC Connected Access Capable,HD Rear Vision Camera,HD Surround Vision w/2 Trailer View Camera Provisions,Heated steering wheel,Illuminated entry,Lane Change Alert w/Side Blind Zone Alert,Lane Keep Assist w/Lane Departure Warning,Multicolor 15" Diagonal Head-Up Display,OnStar & GMC Connected Services Capable,Outside temperature display,Overhead console,Passenger vanity mirror,Rear Camera Mirror,Rear Cross Traffic Alert,Rear Dual USB Charging-Only Ports,Rear Prem Floor Liners w/Removable Carpet Insert,Rear reading lights,Rear seat center armrest,Safety Alert Seat,Tachometer,Telescoping steering wheel,Tilt steering wheel,Trip computer,Ultrasonic Front & Rear Park Assist,Voltmeter,Wireless Charging,10-Way Power Driver Seat Adjuster w/Lumbar,10-Way Power Passenger Seat Adjuster w/Lumbar,Front Bucket Seats,Front Center Armrest,Heated 2nd Row Outboard Seats,Heated Driver & Front Outboard Passenger Seating,Perforated Leather-Appointed Front Seat Trim,Power passenger seat,Split folding rear seat,Ventilated Driver & Front Passenger Seats,Passenger door bin,Hitch Guidance,Hitch Guidance w/Hitch View,In-Vehicle Trailering App,Integrated Trailer Brake Controller,Red Recovery Hooks,Alloy wheels,Deep-Tinted Glass,Power Sliding Rear Window w/Rear Defogger,Variably intermittent wipers,3.23 Rear Axle Ratio,*CERTIFIED*,ACCIDENT FREE CARFAX,BALANCE OF FACTORY WARRANTY,4WD/AWD,LEATHER,PASSED OUR RIGOROUS SERVICE INSPECTION,FAST AND EASY FINANCING,***SAVE MORE WHEN YOU TRADE WITH HIESTER CHEVROLET!***