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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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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
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!
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
Had issues with my new 2025 Ram, visited dealership at
Had issues with my new 2025 Ram, visited dealership at 4:30 Heather service writer, looked at vehicle found had bad cells in the battery immediately took truck into bay and had battery replaced. Rate her a solid 10. Don Winkleman.
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 SLT
Vehicle information
Features
Reviews
Fast, friendly and honest service.
Fast, friendly and honest service. Darrin was prompt and very courteous. He didn't hide anything about the vehicle when asked for information.
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.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Jeremiah was very helpful and the repairs were done in
Jeremiah was very helpful and the repairs were done in timely manner. The facility was relaxing and well maintained. The overall service was right on point and will use services again.
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
Matt M helped me and he was amazing would highly
Matt M helped me and he was amazing would highly recommend to friends and family or anyone looking for a car. Made the process super easy I was super grateful for






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
They booked me fast for the service and got the job done
They booked me fast for the service and got the job done quickly after I dropped it off. The place was clean and the staff were very nice .






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
Reviews
Excellent service.
Excellent service. They were very easy to work with and everything prepared when I picked up the truck.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
The CarMax process was so refreshing to someone used to a
The CarMax process was so refreshing to someone used to a lengthy back and forth price process. Our salesman was so friendly and efficient.






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.






GMC Certified
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Repair
Good service, late parts. Kept in contact for updates.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
I am still looking for my perfect truck for what I need.
I am still looking for my perfect truck for what I need. I love you site.






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!






GMC Certified
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Sales process was very easy and quick.
Sales process was very easy and quick. Sales, financing and service/parts department were all knowledgeable and helpful.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Great experience , Blake helped me from beginning to end
Great experience , Blake helped me from beginning to end always responding and being honest. The finance manager was transparent and quick and got me the car I wanted.






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Mark is the BEST will recommend him to EVERYONE who?
Mark is the BEST will recommend him to EVERYONE who?s looking to by a vehicle, everyone at the dealership was very pleasant. NO complaints from me or my family!!






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
It was a great experience working with Matt to get us
It was a great experience working with Matt to get us into a 2017 Chevy Equinox he had to work a little to do it but he did a great job the people are very friendly I would definitely go back again and I definitely would have my relatives and Friends Matt has a good personality and he knows what he's doing I want to thank you all for a great experience with your dealership






Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
We were very impressed with the sales dept when we bought
We were very impressed with the sales dept when we bought our new car. Especially Ashtyn, she was patient with us driving several different ones. And getting the technology specialist to show us all the bells and whistles on it. Please go see Ashtyn@Dpatrick if you're looking for a new/used vehicle. Service dept here is great also they treat you like you matter.
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GMC Sierra 2500 prices by year
Model year | Prices from | Deals |
---|---|---|
2025 GMC Sierra 2500 SLT | $59,034 | 14 Good deals |
2024 GMC Sierra 2500 SLT | $52,995 | 60 Good deals |
2023 GMC Sierra 2500 SLT | $49,500 | 24 Good deals |
2022 GMC Sierra 2500 SLT | $40,749 | 8 Great deals |
2020 GMC Sierra 2500 SLT | $35,196 | 28 Good deals |
2019 GMC Sierra 2500 SLT | $32,995 | 20 Good deals |
2018 GMC Sierra 2500 SLT | $27,000 | 8 Great deals |
2017 GMC Sierra 2500 SLT | $27,590 | 16 Good deals |
2016 GMC Sierra 2500 SLT | $15,995 | 17 Good deals |
About the 2021 GMC Sierra 2500 SLT
SLT shown.
- Seating
- 5
- Door count
- 4
- 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 $50,355, with pricing starting at $40,888.
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 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
SLT (8 styles)
Style | |||||||
---|---|---|---|---|---|---|---|
4WD Double Cab 162" SLT | 2WD Double Cab 149" SLT | 2WD Double Cab 162" SLT | 4WD Double Cab 149" SLT | 4WD Crew Cab 159" SLT | 2WD Crew Cab 159" SLT | 2WD Crew Cab 172" SLT | 4WD Crew Cab 172" SLT |
Inventory price | |||||||
Starting at $54,600 | Starting at $51,600 | Starting at $51,800 | Starting at $54,400 | Starting at $56,200 | Starting at $53,400 | Starting at $53,600 | Starting at $56,400 |
Combined MPG | |||||||
0 | 0 | 0 | 0 | 0 | 0 | 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) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 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
5 Great Deals out of 178 listings starting at $44,999
-
GMC Sierra 2500 2021 AT4
4 Great Deals out of 95 listings starting at $32,500
-
GMC Sierra 2500 2021 SLE
6 Great Deals out of 31 listings starting at $33,988
-
GMC Sierra 2500 2021 Base
6 Great Deals out of 30 listings starting at $29,700
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