AdChoices
2026 GMC SIERRA 1500 AT4 4WD 3.0L DURAMAX DIESEL AT4 PREMIUM TECHNOLOGY PACKAGE SUNROOF MAX TRAILERING FEATURES ONYX BLACK LANCASTER PA
This 2026 GMC Sierra 1500 AT4 4WD is powered by the 3.0L Duramax turbo-diesel paired with a 10-speed automatic transmission. Finished in Onyx Black with a Jet Black and Kalahari leather interior, this loaded AT4 features the AT4 Premium Package, Technology Package, power sunroof, Bose audio, and advanced trailering equipment.
The 3.0L Duramax delivers 305 horsepower and 495 lb-ft of torque, providing excellent low-end pulling power, impressive fuel efficiency, and smooth highway performance. It's a fantastic engine for buyers who tow, travel long distances, or simply want diesel capability in a half-ton truck.
The AT4 combines premium comfort with genuine off-road capability. Its off-road suspension, Hill Descent Control, automatic locking rear differential, heavy-duty air filter, red recovery hooks, and high-clearance steps make this Sierra ready for hunting properties, campsites, and rough terrain.
Inside, the AT4 Premium Package delivers an upscale experience with perforated leather seating, heated and ventilated front seats, heated rear outboard seats, and a premium Bose 7-speaker sound system. The power sunroof, wireless charging, remote start, and power-sliding rear window add everyday convenience.
The Technology Package is a major highlight, bringing a 15-inch multicolor Head-Up Display, Rear Camera Mirror, Bed View Camera, and HD Surround Vision. These features provide outstanding visibility whether you're navigating traffic, backing into a parking space, or connecting a trailer.
This Sierra is exceptionally well-equipped for towing with an integrated trailer brake controller, Hitch Guidance, Hitch View, trailer camera provisions, GMC's in-vehicle trailering app, and Trailer Side Blind Zone Alert. Rear Cross Traffic Braking and front and rear parking sensors provide additional confidence.
The Onyx Black exterior looks especially sharp with black chrome grille accents, 20-inch machined aluminum wheels, and the AT4's aggressive stance. A factory spray-on bedliner, LED cargo lighting, rear wheelhouse liners, and 120-volt bed outlet add practical functionality.
Additional upgrades include rain-sensing wipers, navigation, premium floor liners, power-adjustable steering column, and rear pedestrian detection.
Finding a 2026 Sierra AT4 with the 3.0L Duramax, Premium Package, Technology Package, sunroof, Bose audio, and this level of trailering equipment makes it an outstanding combination of luxury, efficiency, and off-road capability.
See it today at Mark Martin Motors in Ephrata, serving Lancaster, Lititz, Lebanon, and York. Call or message us to check availability or schedule your test drive.