2026 GMC SIERRA 1500

If you're searching for a capable, premium off-road truck that blends rugged performance with refined comfort, this 2026 GMC Sierra 1500 AT4 for sale at Prestige Motors Pasco in Pasco, WA is exactly what you've been looking for. Finished in a striking Sterling Metallic exterior, this Crew Cab 4WD diesel truck is a head-turner on the trail and the highway alike. With 36,262 miles on the clock, it has been broken in just right — past the new-vehicle depreciation curve, yet with plenty of hard-working life still ahead.

About This 2026 GMC Sierra 1500 AT4

The AT4 is GMC's serious off-road trim within the Sierra 1500 lineup — not just a cosmetic upgrade, but a purpose-built package designed for buyers who actually use their trucks off the beaten path. This particular example has accumulated moderate mileage, making it an excellent choice for buyers who want a nearly-new truck experience without the full new-vehicle price tag. The Sterling Metallic finish gives it a distinctive, upscale appearance whether it's parked at a job site or in a downtown garage. Stock #20235 is ready for inspection and test drives at Prestige Motors Pasco today.

2026 GMC Sierra 1500 AT4 Performance and Engine

3.0L Duramax Inline-Six Diesel

Under the hood of this Sierra 1500 AT4 sits GMC's 3.0L I6 Duramax diesel engine, paired with a smooth-shifting 10-Speed Automatic transmission and full 4WD capability. This diesel powertrain is a standout choice for truck buyers in the Pasco area and throughout Franklin County who need real pulling power with better-than-average fuel efficiency. The Duramax 3.0L inline-six is known for delivering strong torque at low RPMs — exactly what you want when towing a boat to the Columbia River or hauling equipment across Washington's agricultural landscape.

The 10-speed automatic transmission works seamlessly with the diesel engine, keeping it in its ideal power band whether you're climbing a grade on Highway 395 or cruising through Tri-Cities traffic. The 4WD system on the AT4 is no lightweight — it's paired with an Autotrac transfer case and a two-inch factory suspension lift, giving you serious off-road geometry without sacrificing on-road composure.

GMC Sierra 1500 AT4 Features and Interior

A Crew Cab Built for Work and Comfort

The Crew Cab body configuration means four full-size doors and genuine rear-seat space — a rarity among off-road-oriented trucks that often sacrifice passenger comfort for capability. The AT4 trim elevates the interior experience significantly over base trims, bringing in premium materials, supportive front seats, and GMC's well-regarded infotainment technology.

AT4-specific exterior features include unique badging, black exterior accents, skid plates for undercarriage protection, and all-terrain tires from the factory. Inside, expect heated front seats, a large touchscreen infotainment display with wireless connectivity options, and a MultiPro tailgate — one of the most practical and versatile tailgate designs in the full-size truck segment. The overall experience is that of a premium truck that takes both its driver and its off-road mission seriously.

GMC Sierra 1500 Reliability and Ownership

The GMC Sierra 1500 has long been regarded as one of the most dependable full-size trucks available, sharing its robust platform with the Chevrolet Silverado while adding GMC's premium positioning. The 3.0L Duramax diesel engine in particular has earned a strong reputation among owners for its longevity and low-maintenance character relative to gas alternatives. Diesel owners frequently report excellent long-term reliability when basic maintenance intervals are followed — oil changes, fuel filter replacements, and DEF fluid top-offs are the main routine items.

At 36,262 miles, this Sierra 1500 AT4 is in a well-understood ownership phase — well past any early break-in concerns, and well under the mileage where major drivetrain components typically need attention on a diesel truck. The AT4's off-road hardware, including its skid plates and all-terrain tires, adds an extra layer of confidence whether you're on road or off.

Why Buy From Prestige Motors Pasco in Pasco, WA

Prestige Motors Pasco, located in Pasco in Franklin County, Washington, has built a reputation for providing buyers across the Tri-Cities region with quality pre-owned vehicles and straightforward, respectful service. When you shop at Prestige Motors Pasco, you're working with a local team that understands the needs of Eastern Washington truck buyers — from towing needs along the Columbia Basin to weekend off-road adventures in the Cascades or the Blues.

The team at Prestige Motors Pasco in Pasco, WA is committed to making the purchase process transparent and low-pressure. See the current price listed on this page, ask all the questions you want, and schedule a test drive at your convenience. This kind of community-focused approach is what keeps buyers coming back and referring friends.

Financing a Used GMC Sierra 1500 Near Pasco

Financing a used truck like this 2026 GMC Sierra 1500 AT4 near Pasco, WA is easier than many buyers expect. Prestige Motors Pasco works with a network of lenders to find financing solutions for a wide range of credit profiles — whether your credit is excellent, still being rebuilt, or somewhere in between. First-time truck buyers and established buyers alike are welcome to apply.

This Sierra 1500 AT4 is competitively priced — see the current figure listed on this page. The finance team at Prestige Motors Pasco can walk you through term options and help you understand your monthly commitment before you sign anything. Getting pre-approved is a smart first step, and the team is happy to help you start that process over the phone or online.

Frequently Asked Questions

Is the 2026 GMC Sierra 1500 AT4 a good buy?

Absolutely. The 2026 Sierra 1500 AT4 represents one of the most well-rounded off-road-capable full-size trucks available. The AT4 trim adds factory off-road hardware, a suspension lift, skid plates, and all-terrain tires while maintaining the comfort and technology features that make the Sierra a premium choice in its class. Combined with the efficient and torquey Duramax diesel engine, it's a highly capable truck for both work and adventure.

How many miles is too many on a 2026 GMC Sierra diesel?

Diesel engines like the 3.0L Duramax in the Sierra 1500 are engineered for high mileage longevity. Many diesel truck owners report reliable operation well past 200,000 miles with proper maintenance. At 36,262 miles, this example is in excellent position on the ownership curve — low enough to offer many worry-free years ahead, with the initial depreciation already absorbed by the first owner.

What does the AT4 trim include on the Sierra 1500?

The AT4 is GMC's performance off-road trim and includes a factory two-inch suspension lift, Rancho shocks, skid plates, all-terrain tires, unique AT4 badging, and black exterior accents. Inside, it adds premium seating surfaces, heated front seats, an upgraded infotainment display, and GMC's MultiPro tailgate. It's positioned above the SLE and SLT trims and below the AT4X, offering an excellent blend of off-road hardware and interior comfort.

Is the 3.0L Duramax diesel reliable?

Yes — the 3.0L inline-six Duramax diesel has received consistently positive feedback from owners and automotive reviewers since its introduction. It delivers impressive torque for towing and hauling while returning strong fuel efficiency numbers for a full-size truck. With routine maintenance including oil changes and fuel filter replacements, it's widely considered one of the most reliable engines available in the Sierra 1500 lineup.

Can I test drive this Sierra 1500 AT4 near Pasco, WA?

Yes. This 2026 GMC Sierra 1500 AT4 (Stock #20235) is available for test drives at Prestige Motors Pasco in Pasco, Washington. Call 509-416-5700 to confirm availability and schedule a time that works for you, or simply stop by the lot.

Serving Pasco and Surrounding Areas

Prestige Motors Pasco proudly serves buyers throughout Pasco and the greater Franklin County, Washington area. Drivers regularly make the trip from Kennewick, Richland, West Richland, Connell, Othello, Prosser, and Sunnyside to shop the inventory at Prestige Motors Pasco. Whether you're crossing the Blue Bridge from Kennewick or driving in from the farmlands east of Franklin County, the team here makes the trip worthwhile.

Eastern Washington truck buyers know what they need in a vehicle — reliability, capability, and value. This 2026 GMC Sierra 1500 AT4 diesel checks every one of those boxes. The Tri-Cities area's mix of agriculture, outdoor recreation, and wide-open terrain makes a truck like this a natural fit.

Contact Prestige Motors Pasco Today

Ready to get behind the wheel of this 2026 GMC Sierra 1500 AT4 in Sterling Metallic? Contact Prestige Motors Pasco in Pasco, WA today by calling 509-416-5700. The team is happy to answer questions, walk you through financing options, or schedule a no-pressure test drive at your convenience. This is a truck that speaks for itself — come see it in person and experience the difference the AT4 package makes on and off the road.