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Used
2021 GMC Sierra 2500 AT4 trucks
for sale
near me
- 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.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
While my personal Service Advisor had a personal
While my personal Service Advisor had a personal emergency, the gentleman who took care of me provided the ultimate service! I always receive excellent service from the scheduling to the service to when I leave.
Beautiful truck
I love my 2021 GMC Denali 2500HD. I have gotten more complements on this truck than any other vehicle that I have owned. I get great highway fuel milage average 19-26mpg,which is great for a heavy duty truck!






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Jason was upfront, honest and straight to the point.
Jason was upfront, honest and straight to the point. Didn?t play any games. I was offered a fair value for my trade in (unlike other dealerships). I was able to get my trade in and drive away in a brand new vehicle all under 3 hours.
Best truck I ever owned
Love my GMC. Owned a Chevy and this absolutely beats it hands down. Never had any issues. Inside is very comfortable and can't imagine driving anything else






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
It was a great experience at envision ford!
It was a great experience at envision ford! Everyone was friendly and helpful. William made it an easy transaction and I love my Maverick!
GMC 2500 HD AT4
This is the first diesel I have owned. The power is amazing and I really like the room inside the cab. This truck is a beast... Love it!






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Dimmit Cadillac Clearwater 100%the BOMB…
I’ve been to many car dealerships in my life…dimmit Cadillac Clearwater is the absolute BEST…the people make you feel like family …❤️Their kindness is Awsum….!!!! I recommend dimmit Cadillac 100%is the place to go…you won’t leave disappointed !!! Love y’all 🙏🏻🎚❤️💕
Never had one. Always wanted one and love it.
I love my Denali. Beautiful truck inside out. When I drive down the road all heads turn. I couldn't have made a better choice. That's Cortez for you good service.






Certified
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
I didn’t end up buying a car there but Brittany was very
I didn’t end up buying a car there but Brittany was very responsive and probably the best online vehicle sales person I’ve encountered.
Early to tell truck has less than 100 miles
Truck was bought specifically to our travel trailer. We have to wait for 1000 break in before we can tow the trailer. So far the truck is very quiet, smooth running, & comfortable to drive. We were pleasantly surprised at how much interior storage space is available. Having the bed steps before rear tires and in the bumper sides is very nice. Bed rails are even with my shoulders so the steps get used a lot.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Ehren and Laz were great to work with from start to
Ehren and Laz were great to work with from start to finish. We experienced top notch service with no pressure to buy. We took off work to come to Aurora and appreciate their prompt attention and being ready when we arrived. Also enjoyed the conversations while there. Get to know Laz and Ehren, you won’t regret it.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Joseph Aviles was very helpful and got us in and out very
Joseph Aviles was very helpful and got us in and out very efficiently! Very happy with all service and our 2023 dodge challenger scat pack!






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
This has been the very best experience in a car
This has been the very best experience in a car dealership ever. Donavan the sales guy was truthful and helpful. Everyone else was easy to deal with as well.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
The greatest experience I've ever had purchasing a
The greatest experience I've ever had purchasing a vehicle. Everyone at this dealership is friendly and they do not give you the run around. Great job Alexander Ford, Kenedy Tx.






Vehicle information
Features
Reviews
Service department done a great job of getting our
Service department done a great job of getting our vehicle repaired in a timely and efficient manner. I would recommend this dealership for service and sales.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
I had the pleasure of working with Todd in the purchase
I had the pleasure of working with Todd in the purchase of my vehicle. He was friendly, knowledgeable, and responsive. I highly recommend working with Todd.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Always a pleasure to get my truck serviced at Mike
Always a pleasure to get my truck serviced at Mike maroone Chevrolet, gmc, Longmont. Joe was my service advisor and got my truck in and serviced a lot faster then i expected. Service was an awesome. Thank yous






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Great Experience
This was my first experience in 21 years to get another car I was greeted at a very helpful young man Joseph Tassone ask what was thinking and wasn’t pushing what was not what I was looking for so I got what I wanted and Veronica Tassone was also so helpful as deal was closed I would recommend Joseph and Veronica for good personal service in your Auto buying






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Was a great experience and will definitely tell family
Was a great experience and will definitely tell family members about it. Thanks for all the service you?ll do. Have a nice Day and a great weekend.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
The dealership is really great and have really great
The dealership is really great and have really great staff and ownership. They make you feel comfortable and at feel good about the whole process






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Great experience
Found a vehicle I was looking for and emailed Way Brothers via the cars.com site and got a prompt response from Marshall. The exchange was straightforward with a refreshing lack of overbearing sales tactics. Marshall was able to provide a fair price on the vehicle in question and a fair range for the trade-in. When I arrived I was able to drive the vehicle and determine it was in the state they reflected via the listing and email. Overall the transaction was stress free and I would recommend Marshall and the Way Brothers team for your vehicle needs.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
Awesome service/repair department
My Suburban broke down, they were efficient and helpful in getting my vehicle repaired. Allan was great and I would definitely recommend this dealership to others.






Used
2021 GMC Sierra 2500 AT4
Vehicle information
Features
Reviews
My review with Gortsema motors and my sales person
I had the best experience I have buying a vehicle at Gortsema my salesperson was fun to visit and deal with Sabrina answered all our questions and we got a great deal. Very easy place to purchase from. We love the pickup we bought. I for one recommend Gortsema motors to anyone looking for a vehicle at a reasonable price
GMC Sierra 2500 prices by year
Model year | Prices from | Deals |
---|---|---|
2026 GMC Sierra 2500 AT4 | $67,335 | |
2025 GMC Sierra 2500 AT4 | $67,392 | 26 Great deals |
2024 GMC Sierra 2500 AT4 | $49,995 | 6 Great deals |
2023 GMC Sierra 2500 AT4 | $52,000 | 11 Great deals |
2022 GMC Sierra 2500 AT4 | $32,995 | 16 Great deals |
2020 GMC Sierra 2500 AT4 | $34,998 | 29 Good deals |
About the 2021 GMC Sierra 2500 AT4
AT4 shown.
- Seating
- 5
- Door count
- 4
- Drivetrain
- Four Wheel Drive
- Combined MPG
- 0
- Transmission
- 6-Speed A/T
- Engine
- 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)

How much does the 2021 GMC Sierra 2500 AT4 cost?
The 2021 GMC Sierra 2500 AT4 price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 2500 AT4 is $56,247, with pricing starting at $34,995.
What are some similar vehicles and competitors of the 2021 GMC Sierra 2500 AT4?
The 2021 GMC Sierra 2500 AT4 compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 2500 AT4 reliable?
The 2021 GMC Sierra 2500 has an average reliability rating of 4 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2021 Sierra 2500 owners.
75% of drivers recommend this car
- Comfort 4.7
- Interior 4.6
- Performance 4.3
- Value 3.9
- Exterior 4.6
- Reliability 4.0
AT4 (2 styles)
Style | |
---|---|
4WD Crew Cab 172" AT4 | 4WD Crew Cab 159" AT4 |
Inventory price | |
Starting at $59,300 | Starting at $59,100 |
Combined MPG | |
0 | 0 |
Engine | |
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-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.
GMC Sierra 2500 trims
-
GMC Sierra 2500 2021 Denali
17 Great Deals out of 179 listings starting at $41,995
-
GMC Sierra 2500 2021 SLE
8 Great Deals out of 35 listings starting at $26,798
-
GMC Sierra 2500 2021 SLT
2 Great Deals out of 34 listings starting at $39,850
-
GMC Sierra 2500 2021 Base
11 Great Deals out of 32 listings starting at $24,700
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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.