# 2021 GMC Sierra 1500 AT4 - Canonical page: https://rskcars.com/cars-for-sale/2021-gmc-sierra-1500-at4-for-sale-in-oregon-3gtu9eet9mg120159/ - Availability: In stock - Updated: 2026-10-23T15:04:33.084Z - Dealership: Newberg Chevrolet - Dealership address: 2700 Portland Rd, Newberg, OR 97132 - Dealership phone: (503) 476-3309 - VIN: 3GTU9EET9MG120159 - Stock number: P4663 - Condition: Used - Sale price: $37,985 - Documentation fee: $200 - Final price: $38,185 - Mileage: 76,582 miles - Exterior color: Onyx Black - Interior color: Jet Black With Kalahari Accents - Body style: Truck - Drivetrain: 4WD - Transmission: Automatic - Engine: 6 cyl 3L - Fuel type: Diesel - Doors: 4 - Fuel economy: 22 city / 26 highway MPG - Certified: No ## Description 2021 GMC Sierra 1500 AT4 | 3.0L Duramax Diesel | Crew Cab 4x4 | Newberg Chevrolet Off-road capability, diesel efficiency, and premium AT4 equipment come together in this 2021 GMC Sierra 1500 AT4. Finished in Onyx Black over Jet Black with Kalahari accents and showing 76,825 miles, this Crew Cab 4WD pairs GMC's 3.0L Duramax turbo-diesel inline-six with a 10-speed automatic transmission. The 3.0L Duramax is factory rated at 277 horsepower and 460 lb-ft of torque for 2021, delivering strong low-rpm pulling power with the smooth character of an inline-six. Paired with the 10-speed automatic, it gives this Sierra an appealing combination of highway manners, torque, and diesel efficiency. AT4 is GMC's purpose-built premium off-road trim. Its factory hardware includes a 2-inch suspension lift, Rancho monotube shocks, skid plates, Hill Descent Control, an automatic locking rear differential, two-speed Auto Trac transfer case, all-terrain tires, and distinctive red recovery hooks. That gives the AT4 real capability beyond its aggressive appearance. The Onyx Black exterior works especially well with AT4's darker trim and rugged stance. Inside, the Jet Black cabin with Kalahari accents is one of the trim's signature details, creating an upscale environment that still looks unmistakably different from a conventional Sierra SLT. AT4 equipment includes leather-appointed seating, heated and ventilated front seats, heated rear outboard seats, a heated steering wheel, dual-zone automatic climate control, remote start, and power-adjustable front seating. Crew Cab dimensions provide generous rear passenger room and useful secure storage for work gear, family travel, or recreation. Modern GMC infotainment brings smartphone integration, touchscreen controls, driver information displays, and trailering-oriented technology into the cabin. Because no VIN-specific factory window sticker was provided, buyers should verify this truck's exact optional packages, cameras, audio system, sunroof, driver-assistance features, and trailering equipment during inspection. At 76,825 miles, this Sierra has been driven, so service history and condition should be part of the buying decision. Buyers should evaluate tires, brakes, suspension, 4WD operation, diesel emissions-system operation, fluids, and overall maintenance history. If towing is part of your plans, verify the door-jamb payload certification, axle ratio, GVWR/GCWR, hitch equipment, and specific trailer rating for this truck and your intended application. For shoppers comparing a Chevrolet Silverado 1500 LT Trail Boss, Ram 1500 Rebel, Ford F-150 Tremor, Toyota Tundra, or another premium off-road pickup, the Sierra AT4 adds something especially appealing: 460 lb-ft of Duramax torque, factory off-road hardware, Crew Cab versatility, and a premium interior. Searching for a 2021 GMC Sierra 1500 AT4 for sale, 3.0L Duramax Sierra, diesel AT4, used Crew Cab 4x4, Onyx Black GMC truck, or off-road diesel pickup near Portland? This Sierra deserves attention throughout Newberg, Mc Minnville, Yamhill County, Sherwood, Wilsonville, Beaverton, Hillsboro, Portland, and Salem.3.0L DURAMAX TURBO-DIESEL I6 • 277 HP • 460 LB-FT • 10-SPEED AUTOMATIC • 4WD • AT4 • 2-INCH FACTORY LIFT • RANCHO SHOCKS • AUTO-LOCKING REAR DIFFERENTIAL • ONYX BLACK • KALAHARI-ACCENTED INTERIOR • 76,825 MILES Available now at Newberg Chevrolet. With Duramax torque, AT4 off-road hardware, premium interior appointments, and Crew Cab practicality, this Sierra delivers a compelling mix of diesel capability and everyday refinement. VIN: 3GTU9EET9MG120159 Stock #: P4663 ## Features - AT4 Preferred Package - AT4 Premium 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 - AT4 High Clearance Step (LPO) - Auto-dimming door mirrors - Body-Color Surround Grille - Bumpers: body-color - Front License Plate Kit - 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 Insert Organizer Tray (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 - Heated front seats - Perforated Leather-Appointed Front Seat Trim - Power passenger seat - Split folding rear seat - Ventilated Driver & Front Passenger Seats - Ventilated front seats - Passenger door bin - Hitch Guidance - Hitch Guidance w/Hitch View - In-Vehicle Trailering App - Integrated Trailer Brake Controller - Red Recovery Hooks - 18" x 8.5" Machined Aluminum Wheels - Alloy wheels - Deep-Tinted Glass - Power Sliding Rear Window w/Rear Defogger - Variably intermittent wipers - 3.23 Rear Axle Ratio ## Images - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 1 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-1.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 2 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-2.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 3 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-3.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 4 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-4.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 5 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-5.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 6 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-6.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 7 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-7.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 8 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-8.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 9 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-9.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 10 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-10.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 11 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-11.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 12 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-12.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 13 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-13.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 14 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-14.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 15 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-15.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 16 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-16.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 17 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-17.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 18 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-18.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 19 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-19.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 20 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-20.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 21 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-21.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 22 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-22.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 23 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-23.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 24 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-24.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 25 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-25.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 26 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-26.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 27 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-27.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 28 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-28.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 29 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-29.webp) - 2021 GMC Sierra 1500 AT4 in Onyx Black for sale at Newberg Chevrolet in Newberg, Oregon, photo 30 of 30 (https://storage.googleapis.com/new-rsk-ag.firebasestorage.app/vehicles/3GTU9EET9MG120159/2021-gmc-sierra-1500-at4-for-sale-newberg-or-30.webp) ## Professional review themes - According to EPA estimates reported by Edmunds, the 2021 GMC Sierra 1500 AT4 4WD Diesel delivers 22 mpg city and 26 mpg highway with a maximum highway range of up to 624 miles Sources: edmunds.com (https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHGDqIfO7_xEOHk0vnJcsf0C095beDLIZj6npcdins7gM2Vb8FYIGjAMX9Y10vlzjKXq-6dXVIPP_FWG2QoTLkqybbYry_1Trq9q-LfrVmR5pRHOL0V6O4OsMuz7E9_XeB7_Yvew1iBzrumjl71XxIRX6wvv95HHDSposyLEH8=). ## Specifications and facts - The 2021 GMC Sierra 1500 AT4 4WD Diesel is equipped with a 3.0-liter turbocharged inline-six diesel engine that produces 277 horsepower and 460 lb-ft of torque Sources: edmunds.com (https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQFmKK1J_337ur3UNWUNrr9PTkWZ3bdeVGr9e4rqLJ2I8Gxsn607oo-GpWw_2QI-tRQJf6D0mIPhrVnMz-H7lQbqjByczaZQQQPZ3oU5d6TQtYS_lGV5poB_hc764XYhy4zk4l_ipo5PQA==). - The 2021 GMC Sierra 1500 AT4 4WD Diesel offers a maximum towing capacity of up to 9,000 pounds and a standard payload capacity of 1,540 pounds Sources: edmunds.com (https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHGDqIfO7_xEOHk0vnJcsf0C095beDLIZj6npcdins7gM2Vb8FYIGjAMX9Y10vlzjKXq-6dXVIPP_FWG2QoTLkqybbYry_1Trq9q-LfrVmR5pRHOL0V6O4OsMuz7E9_XeB7_Yvew1iBzrumjl71XxIRX6wvv95HHDSposyLEH8=). ## Pricing disclaimer Final price includes the $200 documentation fee and excludes applicable taxes and government fees. Confirm price, equipment, condition, and availability with the dealership.