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*Estimated payments are calculated by Cars.com and are for informational purposes only. We’ve estimated your taxes based on your provided ZIP code. These estimates do not include title, registration fees, lien fees, or any other fees that may be imposed by a governmental agency in connection with the sale and financing of the vehicle. Other taxes may apply. They do not represent a financing offer or a guarantee of credit from the seller. Actual terms vary by lender.
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New and used
2026 GMC Sierra 2500 AT4 trucks
for sale
near
Adamstown, MD
- Down Payment
- $0
- Net trade-in value
- $0
- Months
- 72
- APR
- 7.0%
- Sales tax
- 0.0%
*Estimated payments are calculated by Cars.com and are for informational purposes only. We’ve estimated your taxes based on your provided ZIP code. These estimates do not include title, registration fees, lien fees, or any other fees that may be imposed by a governmental agency in connection with the sale and financing of the vehicle. Other taxes may apply. They do not represent a financing offer or a guarantee of credit from the seller. Actual terms vary by lender.
**Your Saved Vehicles list will be shared along with your contact information when you submit a vehicle request to a dealership. To opt out of this sharing, please view your options on Cars.com Privacy Notice.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
The service team is the best I have encountered in the
The service team is the best I have encountered in the industry. They are true professionals and provide outstanding customer service.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Donnavan did an outstanding job servicing my 2025 GMC
Donnavan did an outstanding job servicing my 2025 GMC Sierra. He was professional, efficient, and explained everything clearly. Excellent service experience — I highly recommend him!
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Pricing was upfront and competitive.
Pricing was upfront and competitive. I appreciated that they weren’t playing games to try to get me in the door - they honored their price and kept things simple.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
John Barrie kept me updated on my vehicle doing a recall
John Barrie kept me updated on my vehicle doing a recall process if I could give him six stars I would.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Our salesman was Scott.
Our salesman was Scott. Extremely knowledgeable and helpful. Entire experience (bought a 2026 GMC Arcadia) at the dealership was excellent. We moved quickly through the process. Will go back for future vehicles.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
My husband and I were so pleased with our recent purchase
My husband and I were so pleased with our recent purchase of a new truck from Koons in Clarksville. Our sales person Jack was absolutely amazing. From pricing to just plain great customer service we were so pleased. No pressure just a great deal. Thanks Jack. Will definitely share our experience with others.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
We received outstanding customer service from Luis
We received outstanding customer service from Luis Arredondo when buying a 2023 Chevy Bolt, which I am very content with and enjoy driving. The price was reasonable. Luis was always responsive to our inquiries and focused on our needs. I also really appreciate their Sunday sales hours. Service was great in reprinting the key.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Kacey B is a fantastic Service Rep !
Kacey B is a fantastic Service Rep !!…No!, the BEST Service rep of my 48 years of buying GM automobiles, and One of the main reasons we like Koons! Parts Dept. and Frank also great to deal with!! And when I need both- fantastic team !! Service is always timely, job is done correctly. Nothing but kudos for this team !! A+
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Great service , no I’m not writing more words was enough
Great service , no I’m not writing more words was enough Paul was a great at service
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Great service and friendly people.
Great service and friendly people. Donna an is the best. The SUV is running great.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Great customer care and very patient
I dealt with Kevin O'Connor and he was outstanding. He understood what I was looking for and was not trying to sway me one way or another, just offered courteous insight. I really appreciated the care and attention of the whole staff.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
GMC Sierra Depot
Loving my Customizers truck. Just came in for my first oil change. Sales and service is always very friendly and helpful. Logan and Kyle always make sure I am completely satisfied.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Whoa!
Whoa! What a great experience buying a car with Chase McCoy. From the initial introduction, through the final (Red Carpet) pictures to complete the delivery, Chase was beyond easy to work with. He was very attentive, far from over bearing, and extremely thorough. Also, Chris Gaston in (Management), structured a phenomenal deal that we were unable to refuse. Both Chase and Chris made car buying extremely easy, and most certainly a very memorable experience. When the need/want arises will not hesitate to buy from Chase McCoy again.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Without a doubt, this car buying experience stands out as
Without a doubt, this car buying experience stands out as the best one I've had so far! Having bought more than 10 cars in the past, I can confidently say that Ralph and Anthony were incredibly professional, honest, and patient throughout the entire process. Their approach made us feel like part of the family rather than just another customer, and they were attentive to our family's specific needs. Jessica also made the final steps a seamless process without trying to sell us things we didn’t need! We are absolutely thrilled with our new Acadia! I wouldn't hesitate to recommend Sheehy to everyone I know, and I would gladly return as a repeat customer in the future. Thank you Anthony, Ralph, and Jessica!!!
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Bryan DeCarlo service advisor in service was exceptional,
Bryan DeCarlo service advisor in service was exceptional, since the moment I left my car for service and with all my concerns with warranty issues. He explained to me every step of the way, he called me every day to give me updates. I am beyond thankful I went I and had him as my advisor he told me what was needed after and felt no pressure. I am 100% happy with the service I received and from the team also working with him. He was really professional and polite and really smart at what his job is. I could keep going in bragging of the service I received. Hopefully people think same as me. Trust me I have had enough ther advisors and not even close to this kind of service.
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
New
2026 GMC Sierra 2500 AT4
Vehicle information
Features
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About the 2026 GMC Sierra 2500 AT4
AT4 shown.
- Seating
- 5
- Door count
- 4
- Drivetrain
- Four Wheel Drive
- Combined MPG
- 0
- Transmission
- 10-Speed A/T
- Engine
- 470.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
How much does the 2026 GMC Sierra 2500 AT4 cost?
The 2026 GMC Sierra 2500 AT4 price depends on optional features. Prices typically start at $71,600.
What are some similar vehicles and competitors of the 2026 GMC Sierra 2500 AT4?
The 2026 GMC Sierra 2500 AT4 compares to and/or competes against the following vehicles:
AT4 (2 styles)
| Style | |
|---|---|
| 4WD Crew Cab 172" AT4 | 4WD Crew Cab 159" AT4 |
| Inventory price | |
| Starting at $71,800 | Starting at $71,600 |
| Combined MPG | |
| 0 | 0 |
| Engine | |
| 470.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 470.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) |
*Estimated payments are calculated by Cars.com and are for informational purposes only. We’ve estimated your taxes based on your provided ZIP code. These estimates do not include title, registration fees, lien fees, or any other fees that may be imposed by a governmental agency in connection with the sale and financing of the vehicle. Other taxes may apply. They do not represent a financing offer or a guarantee of credit from the seller. Actual terms vary by lender.
**Your Saved Vehicles list will be shared along with your contact information when you submit a vehicle request to a dealership. To opt out of this sharing, please view your options on Cars.com Privacy Notice.
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This vehicle is certified pre-owned, backed by a manufacturer warranty, and typically undergoes a rigorous multi-point inspection to ensure quality and reliability.
This vehicle is currently in high demand given its competitive price, desirable features, and overall condition, and may have a higher chance of selling quickly.
