2021 GMC Sierra 1500 AT4 Crew Cab 4WD

Discover a rugged and refined 2021 GMC Sierra 1500 AT4 4WD, now available in McConnellsburg, PA. This striking pickup pairs a smooth 6-cylinder 3.0L diesel engine with off-road-ready AT4 suspension and features designed for confident driving in any condition. With CARFAX 1-Owner history, this GMC Sierra offers proven care and dependable ownership. Inside, enjoy premium comfort and advanced tech: steering wheel audio controls put entertainment and phone functions at your fingertips, while adaptive cruise control enhances highway convenience and safety. The integrated navigation system guides each journey with clear maps and real-time route direction, and the back-up camera provides reliable rear visibility for parking and trailering. Built to handle work and weekend adventures, the AT4 trim delivers durable construction, supportive seating, and thoughtful storage solutions for tools and gear. Safety-focused features and modern connectivity make this GMC Sierra a smart choice for families, outdoor enthusiasts, and professional drivers seeking capability without compromise. Located in McConnellsburg, PA, this 2021 GMC Sierra 1500 AT4 is ready for a test drive. Contact us to schedule a viewing or request more detail about options and service history. Experience diesel torque, refined interior appointments, and off-road confidence in one versatile truck.

Additional Information

AT4 CarbonPro Edition: AT4 Carbon Hard Badge; Black Dual Exhaust Tips; MulitPro Audio System by Kicker; Unique Grille Surround with Black Chrome Finish; CarbonPro (carbon Fiber Composite) Bed,Driver Alert Package I: Ultrasonic Front and Rear Park Assist; Rear Cross Traffic Alert; Perimeter Lighting; Lane Change Alert with Side Blind Zone Alert,Driver Alert Package II: Forward Collision Alert; Lane Keep Assist with Lane Departure Warning; Front Pedestrian Braking; Following Distance Indicator; Automatic Emergency Braking; Safety Alert Seat; IntelliBeam Automatic High Beam On/off; Adaptive Cruise Control,Technology Package: 8" Driver Information Center; HD Surround Vision with 2 Trailer View Camera Provisions; Multicolor 15" Diagonal Head-Up Display; Bed View Camera; Rear Camera Mirror,AT4 Value Package,Preferred Equipment Group 4SB: HD Rear Vision Camera; LED Cargo Area Lighting; Remote Vehicle Starter System; 2 USB Ports (1st Row); Hill Descent Control; Electric Rear-Window Defogger; Floor-Mounted Center Console; Theft Deterrent System (unauthorized Entry); Body-Color Surround Grille; 170 Amp Alternator; Auxiliary External Transmission Oil Cooler; Heavy-Duty Air Filter; Skid Plates; Compass; 4.2" Diagonal Color Display Driver Info Center; Electrical Lock Control Steering Column; Trailering Package; 120-Volt Instrument Panel Power Outlet; Heated Driver and Front Outboard Passenger Seating; Off-Road Suspension; Front Premium Floor Liners with Removable Carpet Insert; Steering Wheel Audio Controls; GMC Connected Access Capable; Color-Keyed Carpeting Floor Covering; OnStar and GMC Connected Services Capable; Power Front Passenger Windows with Express Up/down; 2-Speed Transfer Case; Deep-Tinted Glass; Spray-On Pickup Bed Liner with AT4 Logo; Power Rear Windows with Express Down; Red Recovery Hooks; Integrated Trailer Brake Controller; Power Front Windows with Driver Express Up/down; Ventilated Driver and Front Passenger Seats; Manual Tilt-Wheel and Telescoping Steering Column; Rear Dual USB Charging-Only Ports; Keyless Open and Start; 4G LTE Wi-Fi Hotspot Capable; ProGrade Trailering System; Rear Wheelhouse Liners; 12-Volt Rear Auxiliary Power Outlet; 2 USB Ports; Auto-Locking Rear Differential; Power Door Locks,AT4 Preferred Package: Premium Bose 7-Speaker Sound System; Power Sliding Rear Window with Rear Defogger; Wireless Charging; Universal Home Remote; Premium GMC Infotainment System Radio with Navigation,Power Sunroof,MulitPro Audio System by Kicker,20" X 9" 6-Spoke Carbon Gray Painted Aluminum Wheels,All-Weather Floor Liners with AT4 Logo,275/60R20SL AT BW Tires,Apple CarPlay/Android Auto smart device mirroring,Forward Collision Alert with Automatic Braking,Front Pedestrian Braking,4G LTE Wi-Fi Hotspot capable mobile hotspot internet access,HD Rear Vision Camera w/Hitch View rear mounted camera,Lane Keep Assist with Lane Departure Warning,Adaptive cruise control,Head-up display,Brake assist system,Cruise control with steering wheel mounted controls,Ventilated driver and front passenger seats,Integrated navigation system,Keyfob remote start,Heated steering wheel,Heated driver and front passenger seats,Heated rear seats,Leather front seat upholstery,Primary monitor touchscreen,Rear Cross-Traffic Alert collision warning,First-row sliding and tilting glass sunroof with express open/close activation sunshade,Driver seat power reclining, lumbar support, cushion tilt, fore/aft control and height adjustable control,AutoTrac part and full-time 4WD,Duramax 3L I-6 diesel direct injection, DOHC, variable valve control, intercooled turbo, diesel, engine with 277HP,Duramax 3L I-6 DOHC,Front wireless smart device charging,Teen Driver restricted driving mode/alerts,Smart key with hands-free access and push button start,Keyfob window control,Aerial view camera,Push-button,Video-feed rearview mirror,Bluetooth wireless audio streaming,Hitch Guidance vehicle to trailer hitching assist,Front mounted camera,Right side camera,Pickup box camera,Left side camera,Lane Change Alert with Side Blind Zone Alert blind spot warning,Following Distance Indicator,GMC ProGrade Trailering System trailer light test,GMC ProGrade Trailering System trailer light malfunction warning,GMC ProGrade Trailering System trailer theft alarm,Dual-zone front climate control,IntelliBeam auto high-beam headlights,Immobilizer,Bose speakers,Bluetooth handsfree wireless device connectivity,Trailer brake controller,Trailer Sway Control (TSC) trailer sway control,Trailering Assist Guidelines vehicle and trailer reverse assist with visual graphic guidance only,3.0L I6 Turbo Diesel Engine,ProGrade Trailering Pkg.,Aluminum/Alloy Wheels,Bose Premium Stereo,GMC MultiPro Tailgate,Heads-Up Display,Heated Exterior Mirrors,Power Adjustable Mirrors,Power Door Locks,Power Driver's Seat,Power Windows,Rear Parking Sensors,Steering Wheel Mounted AudioControls,Univ Garage Door Opener,6-Cyl; Turbo Diesel; 3.0 Liter,Automatic; 10-Spd w/Overdrive,4WD,Hill Descent Control,Hill Start Assist Control,Traction Control,StabiliTrak,ABS (4-Wheel),Theft Deterrent System,Keyless Entry,Keyless Start,Air Conditioning,Cruise Control,Power Tailgate Release,Power Steering,Tilt & Telescoping Wheel,AM/FM Stereo,SiriusXM Satellite,Bluetooth Wireless,OnStar,Premium GMC Infotainment System,Backup Camera,Dual Air Bags,Side Air Bags,F&R Head Curtain Air Bags,Heated & Ventilated Seats,Dual Power Seats,Leather,HID Headlamps,Daytime Running Lights,LED Headlamps,Fog Lights,Bed Liner,Towing Pkg,Alloy Wheels,3.0L Duramax Diesel