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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 SLE 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 SLE
Vehicle information
Features
Reviews
Purchased a used 2022 Super Duty at Kendall Ford Eugene.
Purchased a used 2022 Super Duty at Kendall Ford Eugene. Great experience! My salesperson Jeff was exceptional to work with and made me feel comfortable the entire time.
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 SLE
Vehicle information
Features
Reviews
Calvin and Curtis went above and beyond.
Calvin and Curtis went above and beyond. They made me feel like family. Listened to my needs and gave me everything I was looking for. Highly recommended
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
Vehicle information
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Reviews
Very Quick and smooth process.
Very Quick and smooth process. Sale agent victor was really nice. Would definitely do business with them again! Thank you again!
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 SLE
Vehicle information
Features
Reviews
Fantastic experience at International Auto Sales in
Fantastic experience at International Auto Sales in Garland, TX! From start to finish, the team was professional, honest, and incredibly helpful. The GM and Finance Manager made the entire car-buying process smooth and stress-free. Selection was top-notch, and the pricing was fair and transparent. I felt valued as a customer and never pressured. If you're looking for quality cars and five-star service, this is the place to go. Highly recommended!
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 SLE
Vehicle information
Features
Reviews
Best place I’ve ever been for a car.
Best place I’ve ever been for a car. We’ve bought two cars now. Any issues they helped us out immediately just very pleasant to work with these great folks. I would highly recommend you go check them out. You won’t be disappointed I promise
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 SLE
Vehicle information
Features
Reviews
In my search for a new vehicle, Mike Neilson went above
In my search for a new vehicle, Mike Neilson went above and beyond to locate the vehicle I wanted to buy. He was very kind, courteous, and helpful. He is one great salesman!! If you are in the market for another vehicle, look up Mike! You will not be disappointed!
Used
2021 GMC Sierra 2500 SLE
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Features
Reviews
They were fantastic!
They were fantastic! I was worried about my first time buying a car! But they made it so easy!!
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
Very friendly, courteous and accommodating.
Very friendly, courteous and accommodating. I was helping my grandson car shop but he made a decision on a different vehicle. I liked the car so much that I almost bought it for myself.
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
I just interested in a vehicle, I haven't even purchased
I just interested in a vehicle, I haven't even purchased one yet. I'm working with Jeff ODell, & I gotta say, what a not only nice but polite man. As car salesman go they remind me of lawyers. Jeff, he reminds me of like a preacher, very soft spoken, not pushy, well mannered, I really like him. I'm from a different city than his but it's well worth the trip to be treated with the kindness that they put out. Very nice man!
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
My experience at auto boutique was very I was very happy
My experience at auto boutique was very I was very happy with my salesman Ola the manager and the finance manager. I recommend anybody go to get a five star for me. We’re very happy me and *my Wife who purchased a vehicle around four 2019 low mileage 36,001 154 miles looks brand new. I love it very happy very experience. I look very good experience so I recommend anyone to go there and get a five stars from me a lot of nice vehicle vehicles.
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
Great Jeep!
Thanks for the Jeep Rick! And thanks for all the help! The Jeep is really neat, I can finally go rock crawling. Dreams really do come true!
Vehicle information
Features
Reviews
Working with Rich Tom was an outstanding experience from
Working with Rich Tom was an outstanding experience from start to finish. They were knowledgeable, transparent, and genuinely focused on helping me find the right truck — not just making a sale. The entire process was smooth, efficient, and pressure‑free. I’m thrilled with my new 2025 F‑150 Lariat and highly recommend Rich to anyone looking for a great buying experience.
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
Great communication, friendly staff, low pressure.
Great communication, friendly staff, low pressure. And the best part was I got exactly what I wanted
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
Our experience there was great.
Our experience there was great. Everyone would cheerfully answer our questions. Our sales person Sheila Passmore really took a lot of time explaining the workings of the car. We still have questions, but Sheila said that we could bug her anytime (we will try not to). She is such a helpful person. The whole purchase was made easy and relaxed, no pressure and no rush at anytime. We have dealt with the Defouw dealership since 2014 and have always had really good sevice.
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
Shawn did a great job working with us to get us the terms
Shawn did a great job working with us to get us the terms we wanted.
Used
2021 GMC Sierra 2500 SLE
Vehicle information
Features
Reviews
Excellent Service There are two Kia dealerships in the
Excellent Service There are two Kia dealerships in the Tulsa area. I highly recommend Ferguson Kia in Broken Arrow. Ashley and Anthony were my service advisors and Zack the service manager, went above and beyond to resolve my problem. I cannot thank them enough for the generosity and compassion that they showed me.
Used
2021 GMC Sierra 2500 SLE
Vehicle information
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GMC Sierra 2500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 2500 SLE | 1 Good deal | |
| 2025 GMC Sierra 2500 SLE | $58,684 | 17 Good deals |
| 2024 GMC Sierra 2500 SLE | $53,319 | 12 Great deals |
| 2023 GMC Sierra 2500 SLE | $46,142 | 9 Great deals |
| 2022 GMC Sierra 2500 SLE | $41,812 | 20 Great deals |
| 2020 GMC Sierra 2500 SLE | $37,798 | 7 Good deals |
| 2017 GMC Sierra 2500 SLE | $29,430 | 10 Good deals |
About the 2021 GMC Sierra 2500 SLE
SLE shown.
- 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 SLE cost?
The 2021 GMC Sierra 2500 SLE price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 2500 SLE is $41,303, with pricing starting at $29,987.
What are some similar vehicles and competitors of the 2021 GMC Sierra 2500 SLE?
The 2021 GMC Sierra 2500 SLE compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 2500 SLE 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
SLE (10 styles)
| Style | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 2WD Crew Cab 172" SLE | 4WD Crew Cab 159" SLE | 2WD Crew Cab 159" SLE | 4WD Crew Cab 172" SLE | 2WD Double Cab 162" SLE | 2WD Double Cab 149" SLE | 4WD Double Cab 149" SLE | 4WD Double Cab 162" SLE | 4WD Reg Cab 142" SLE | 2WD Reg Cab 142" SLE |
| Inventory price | |||||||||
| Starting at $45,600 | Starting at $48,200 | Starting at $45,400 | Starting at $48,400 | Starting at $43,800 | Starting at $43,600 | Starting at $46,400 | Starting at $46,600 | Starting at $44,400 | Starting at $41,600 |
| Combined MPG | |||||||||
| 0 | 0 | 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) | 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
16 Great Deals out of 192 listings starting at $33,800
-
GMC Sierra 2500 2021 AT4
10 Great Deals out of 112 listings starting at $41,995
-
GMC Sierra 2500 2021 Base
9 Great Deals out of 43 listings starting at $25,997
-
GMC Sierra 2500 2021 SLT
8 Great Deals out of 35 listings starting at $33,900
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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.
