2025 GMC Sierra 1500 AT4

2025 GMC SIERRA 1500 AT4 4WD 3.0L DURAMAX DIESEL TECHNOLOGY PACKAGE AT4 PREMIUM SUNROOF SUMMIT WHITE LANCASTER PA

This 2025 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 and Kalahari leather interior, this is a loaded AT4 with the Technology Package, AT4 Premium Package, AT4 Preferred Package, power sunroof, and extensive trailering technology.

The 3.0L Duramax is a big reason to want this truck.

For 2025, the Duramax produces 305 horsepower and 495 lb-ft of torque, giving you a ton of low-end torque without moving into a heavy-duty pickup. It's smooth, quiet, and especially well suited to highway driving and towing. For someone who puts a lot of miles on a truck but still wants legitimate capability, the 3.0 Duramax is one of the most appealing engines in the Sierra lineup.

Then there's the AT4 package.

This isn't simply an appearance trim. The AT4 is designed around additional off-road capability with Hill Descent Control, an auto-locking rear differential, heavy-duty air filter, additional ground clearance, and those unmistakable red recovery hooks. This one also has the off-road high-clearance steps, which fit the AT4 considerably better than traditional low-hanging running boards.

Inside, the Jet Black leather with Kalahari accents immediately separates an AT4 from a regular Sierra. You get heated and ventilated front seats, heated second-row seats, power-adjustable steering column, wireless charging, and a power sliding rear window.

This truck also has the AT4 Premium and Preferred Packages, bringing together many of the comfort and convenience features you'd want if you're going to use this as an everyday truck.

The Technology Package is where this Sierra really gets impressive.

You get the huge 15-inch multicolor Head-Up Display, HD Surround Vision, Bed View Camera, and a Rear Camera Mirror. The combination gives you excellent visibility around the truck, into the bed, and behind iteven when passengers or cargo would normally block your view.

And if you're towing, the technology gets even more useful.

This AT4 has the Trailering Package, integrated trailer brake controller, Hitch Guidance with Hitch View, in-vehicle trailering app, Trailer Side Blind Zone Alert, and provisions for additional trailer cameras. It's a very complete factory setup for someone who regularly pulls a camper, boat, or equipment trailer.

There's also Bose premium audio, Navigation, rain-sensing wipers, front and rear parking sensors, Rear Cross Traffic Braking, and Rear Pedestrian Detection.

The bed is ready to be used too, with a factory GMC spray-on bedliner, LED cargo lighting, 120-volt power outlet, and trailer-camera provisions. Another 120-volt outlet inside the cab gives you additional power for laptops, chargers, or other equipment.

That's what makes the 3.0 Duramax AT4 such a good combination. You get the efficiency and massive low-end torque of the diesel, the off-road capability and styling of an AT4, and enough luxury and technology that you don't feel like you're giving anything up compared with a more road-focused premium truck.

And the mileage is another plus. This Sierra is sitting 2,201 miles below the market average.

If you're searching for a 2025 GMC Sierra 1500 AT4 3.0 Duramax diesel near Lancaster, this Summit White truck has the equipment you want: Technology Package, AT4 Premium and Preferred Packages, sunroof, 15-inch Head-Up Display, Surround Vision, Rear Camera Mirror, Bose audio, heated and ventilated leather, and a complete factory trailering setup.

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.