Save your search and get notified when new inventory arrives.
Contact seller
Customize your budget
*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.
About your privacy: Cars.com is asking for your ZIP and credit rating because it helps us to make an educated guess at your sales tax and loan interest. These two factors can greatly change your monthly payment.
Used
2021 GMC Sierra 2500 SLT 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 SLT
Vehicle information
Features
Reviews
Very smooth process from start to finish.
Very smooth process from start to finish. Arrived at appointed time and was immediately taken care of. Marco, my technician, took the time to keep me updated on the car's progress. When the work was finished, I received my paperwork and went merrily on my way until the next service.
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 SLT
Vehicle information
Features
Reviews
I wanted to commend the service department on their
I wanted to commend the service department on their professionalism. I had Johnny take care in a recall for my Ford Transit Connect. They did an overall inspection and suggested a few services that should be done. He didn’t try to scare me to do them and did only the services I authorised after he took the time to explain how they perform the work. Upon picking up my vehicle Spencer who has helped me in the past was great in helping delivering my vehicle. I also want to thank Alex in Mobil Vehicle Service for setting up my oil change. Great Team!!
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 SLT
Vehicle information
Features
Reviews
I was looking for a specific truck- Matt Elliott was more
I was looking for a specific truck- Matt Elliott was more than accommodating - over-the-top. He went out of the way to add the missing pieces to the truckand the results we far better than I expected. Great service all the way around! Highly recommend this dealership!!
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!






Vehicle information
Features
Reviews
Easy process.
Easy process. Very nice people. The salesman was very patient with me and worked to get me the right vehicle. This was my second vehicle to purchase within the last 12 months. Great experience.
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.






GMC Certified
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Repair
Good service, late parts. Kept in contact for updates.
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 SLT
Vehicle information
Features
Reviews
The best experience I’ve ever had in purchasing a car!
The best experience I’ve ever had in purchasing a car! Dan gave us an incredible deal, and Chris was amazing to work with. I highly recommend Lyn Lyall Chevrolet!






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
I bought a 2018 Nissan pro x a little over a year ago.
I bought a 2018 Nissan pro x a little over a year ago. I drove from ny to look at it it was clean except for front bumper was hit in corner and paint was scraped. They repaired the damage perfectly by the time I picked it up. I was impressed by their professionalism. The only thing that I thought was a little extravagant was the dealer fee. We negotiated a fair price and now it’s mine. I’ve had the vehicle for over a year and it is flawless. I felt I needed time to make a fair judgement of the vehicle before my review. I would not hesitate to buy another vehicle from thi dealership






GMC Certified
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
That time again!
Loved working with Brandon Hamilton and his GM. Hope to work with you in the future!






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Great old fashioned way of doing business.
Great old fashioned way of doing business. Professional, smooth, non-rushed atmosphere. Mr. Paul Macchi is a great, concientious employee. I thank him for his courtesies and cordiality.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
They will work with you until you are satisfied.
They will work with you until you are satisfied. I personally went back like 4 times to find the right car, Derek was nice enough to open my options to out of town cars and ship them to my local dealer. Jeremy,Derrick,Abrian,Bobby and Daishon all worked so hard to get me the right numbers and into the right car that worked for my budget and my bug family. Will for sures be taking a family member or two to them!






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Our salesperson, Mitch, did an outstanding job finding
Our salesperson, Mitch, did an outstanding job finding the car we were looking for and setting us up with our new car. Mitch was happy to answer any questions or concerns we had about our purchase.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Staff was very friendly and service was quick I was in
Staff was very friendly and service was quick I was in and out in no time . I had to also pick up floor mats I had ordered and the staff remembered me by name






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
I am so impressed and appreciative of the service team
I am so impressed and appreciative of the service team here. Yes, it can take a long time to get an appointment - depending on what you need done, but the last two times I've brought my truck in for service, they fixed things the other auto shop repaired incorrectly, helped get me to and from the car rental place, and had exceptional communication before, during and after. Their staff is friendly and professional and I trust the work that's done, is done correctly.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Amazing dealership.
Amazing dealership. We’re very professional and courteous. From start to finish they truly went all out. My family and I will be regulars as long as they don’t change the way they operate.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Interest rate did not correlate with credit rating.
Interest rate did not correlate with credit rating. I had to insist on an additional review. I did purchase the car but had doubts that this was the very best deal possible.






GMC Certified
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
im not new to buying cars.
im not new to buying cars. ive owned hundreds and currently own 6 cars , 6 trucks and 3 motercycles. i however am new to the excellent service I received. Ill never buy a car from anywhere else. Bergeys team were the most knowledgeable and and easy to deal with ever. Then theres the deal part. no other place could even come close to what they came up with for me. if I had to describe everything in brief , " like a well oiled machine" When It came time to show me how everything works 3 of the Bergeys team came out. and all my questions was answered. I made the best choice ever Going to Bergeys GMC. The kind of place where you can stop anytime with questions and its not a bother






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Worked with JT and Max for the purchase of a 2020 GMC
Worked with JT and Max for the purchase of a 2020 GMC Acadia. We went in with a set monthly payment idea and they worked with us until we got to where we wanted to be. 10/10 customer service experience! Even if things wouldn’t have worked in our favor, we would have left knowing they did everything they could and actually care for their customers! Highly recommend!






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Great experience
We had a great experience. The team was great to work with. Jack Pickrel worked with us and listened to what we wanted. Loved that it didn’t take all day!!






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Sales staff were very helpful and polite.
Sales staff were very helpful and polite. Their follow up calls and honesty should be a trend setter for other dealers to follow!
-
Prev - 1
- 2
-
Next
GMC Sierra 2500 prices by year
Model year | Prices from | Deals |
---|---|---|
2025 GMC Sierra 2500 SLT | $58,390 | 15 Good deals |
2024 GMC Sierra 2500 SLT | $51,500 | 57 Good deals |
2023 GMC Sierra 2500 SLT | $44,900 | 17 Good deals |
2022 GMC Sierra 2500 SLT | $42,995 | 12 Great deals |
2020 GMC Sierra 2500 SLT | $28,683 | 26 Good deals |
2019 GMC Sierra 2500 SLT | $31,495 | 19 Good deals |
2018 GMC Sierra 2500 SLT | $23,999 | 5 Great deals |
2017 GMC Sierra 2500 SLT | $27,845 | 12 Good deals |
2016 GMC Sierra 2500 SLT | $19,900 | 12 Good deals |
About the 2021 GMC Sierra 2500 SLT
Base shown (base trim).
- Seating
- 3
- Door count
- 2
- Drivetrain
- Rear-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 SLT cost?
The 2021 GMC Sierra 2500 SLT price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 2500 SLT is $51,383, with pricing starting at $41,950.
What are some similar vehicles and competitors of the 2021 GMC Sierra 2500 SLT?
The 2021 GMC Sierra 2500 SLT compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 2500 SLT reliable?
The 2021 GMC Sierra 2500 has an average reliability rating of 4.1 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2021 Sierra 2500 owners.
Is the 2021 GMC Sierra 2500 SLT a good truck?
Below are the Cars.com consumer ratings for the 2021 GMC Sierra 2500.
- Comfort 4.8
- Interior 4.6
- Performance 4.4
- Value 4.0
- Exterior 4.6
- Reliability 4.1
78% of drivers recommend this car
- Comfort 4.8
- Interior 4.6
- Performance 4.4
- Value 4.0
- Exterior 4.6
- Reliability 4.1
*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
6 Great Deals out of 185 listings starting at $41,965
-
GMC Sierra 2500 2021 AT4
2 Great Deals out of 91 listings starting at $36,992
-
GMC Sierra 2500 2021 SLE
11 Great Deals out of 29 listings starting at $30,496
-
GMC Sierra 2500 2021 Base
9 Great Deals out of 24 listings starting at $30,200
- ${price_badge()}
- ${ami_badge()}
- ${battery_badge()}${ev_report_link()}
- ${hot_car_badge()}
- ${award_badge()}
- ${cpo_badge()}
${price_badge_description}
${ami_badge_description}
The EV Battery Rating is based on this vehicle's current expected range relative to the vehicles expected range when new. ${battery_badge_text}
Certified cars are manufacturer warrantied and typically go through a rigorous multi-point inspection.
This car is likely to sell soon based on the price, features, and condition.
${award_blurb}
${award_two_blurb}