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2026 GMC SIERRA 1500 AT4 4WD 3.0L DURAMAX DIESEL CARBONPRO TECHNOLOGY PACKAGE SUNROOF SUMMIT WHITE LANCASTER PA
This 2026 GMC Sierra 1500 AT4 4WD is powered by the 3.0L Duramax inline-six turbodiesel paired with a 10-speed automatic transmission. Finished in Summit White with the signature Jet Black/Kalahari leather interior, this is a loaded AT4 featuring the CarbonPro Edition, AT4 Premium Package, Technology Package, sunroof, and Kicker MultiPro Tailgate Audio.
The 3.0L Duramax produces 305 horsepower and 495 lb-ft of torque, delivering strong low-RPM pulling power while remaining smooth and efficient on the highway. For buyers who tow, commute long distances, or simply want diesel torque without moving into a 2500HD, it's one of the best powertrain combinations in the Sierra lineup.
The AT4 brings legitimate off-road hardware with an off-road suspension, 2-speed 4WD system, automatic locking rear differential, Hill Descent Control, heavy-duty air filter, red recovery hooks, and high-clearance off-road steps.
A major upgrade on this truck is the AT4 CarbonPro Edition. Instead of a traditional steel bed, it uses GMC's Carbon Fiber Composite Bed, designed to resist dents, scratches, and corrosion while also reducing weight. It's a premium feature that's relatively uncommon even among loaded AT4s.
The AT4 Premium and Preferred packages give you a loaded interior with heated and ventilated leather front seats, heated second-row seats, power sunroof, power sliding rear window, wireless charging, remote start, and a power-adjustable steering column.
The Technology Package adds some of GMC's best truck tech, including a massive 15-inch Head-Up Display, HD Surround Vision, Rear Camera Mirror, and Bed View Camera. Those cameras are particularly useful when maneuvering the truck, hooking up a trailer, or checking cargo in the bed.
It's also ready to tow with the Trailering Package, integrated trailer brake controller, Hitch Guidance with Hitch View, in-vehicle Trailering App, Trailer Camera Provisions, and Trailer Side Blind Zone Alert.
The bed adds even more functionality with LED cargo lighting, a 120-volt outlet, and the MultiPro tailgate. This one even has the Kicker MultiPro Tailgate Audio System, turning the tailgate into a built-in outdoor sound system.
Mileage is another advantagethis Sierra is 2,855 miles below the market average.
For someone wanting a premium half-ton that can handle towing, off-road use, and long highway trips, this is a standout combination: 3.0 Duramax, CarbonPro bed, Technology Package, AT4 Premium, sunroof, Surround Vision, and excellent factory trailering equipment.
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.