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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
Excellent service.
Honestly I was starting to feel Very overwhelmed for a time during the price/payment discussions, but Chris and his team were very helpful and willing to work with me and I ended up with a 2019 Ford Escape that I feel very comfortable in.
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
Every person involved in the engine replacement of our
Every person involved in the engine replacement of our family truck should get some sort of bonus and/or recognition for saving our family vacation. They somehow pulled enough strings to get my new engine ordered, shipped, installed, and my truck back to me in about 2 weeks. That allowed us to have a vehicle large enough to tow a boat and have 4 adults comfortably riding down the road.
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
The best dealership.
The best dealership. My service advisor was courteous and professional. Every time I take my vehicle in, I receive top notch service. I highly recommend this dealership to anyone for service, parts, or to purchase a vehicle.
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
We had a great experience Working with our salesman,
We had a great experience Working with our salesman, Kevin Ramos, He was great to work with! Go see Kevin Ramos!
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.
Vehicle information
Features
Reviews
Every interaction has been positive.
Every interaction has been positive. They are helping me find the perfect car! I live their intuitive app as well.
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
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Another satisfied customer 👍
Bought a 2017 Chevy Silverado 2500HD Duramax sales went above and beyond on getting me this truck they even delivered the truck and the paperwork to Kansas City didnt have to get off work and drive 2 hours to Higginsville Missouri 🤙
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Wonderful experience!
Wonderful experience! They took great care of me and really listened to my needs. Will absolutely be back!
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
First time we’ve ordered a vehicle sight unseen (except
First time we’ve ordered a vehicle sight unseen (except for photos) from out of state. Everyone at Midtown Auto were excellent to deal with and made the process extremely Easy. We we first impressed by their ability to find low mileage vehicles and then sell at such a reasonable price. When we received the car, we were impressed that it looked better than the photos and was in pristine condition. It was also full of gas and recently serviced….nice touch. Shipping was easy and FAST. We are delighted with our purchase and would look to them again in the future.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Had a oil change and tire rotation on my Toyota truck and
Had a oil change and tire rotation on my Toyota truck and the service I received was outstanding. The service department kept me informed on what was going on and asked before doing anything extra. Truck was clean inside and out when handed back to me. I would highly recommend DeeryBrothers service department and appreciate the great service I received.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Visiting from Wyoming and car broke down.
Visiting from Wyoming and car broke down. This was a week before Christmas. Service manager Dylan was able to get it check it out right away. Bad news, the engine needed major repairs. Sales man Kevin was excellent, was able to get us into another car quickly and without any hassle. Great service, picked up car 2 days later and was able to finish our visit and make it home as scheduled. They understood our problems and worked with us without any issues, even since we were stranded from out of state. Would recommend.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
No doubt Jim Norton Toyota is the place to buy and
No doubt Jim Norton Toyota is the place to buy and service your car. Service department is top notch, honest and fast. Go see Wyatte at used car sells. He was very professional, honest and polite. I purchased a Titan while getting my Tundra serviced. Great dealership.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
The service requested was done quickly and effeciently.
The service requested was done quickly and effeciently. Melissa was very attentative and professional. I would reccommend the service center for anyone who needs something done.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Service appointment for my GMC 1500 Denali truck today.
Service appointment for my GMC 1500 Denali truck today. From service rep (Christina) thru the whole process I would have to rate 5 out of 5 stars. Updates came every 20-30 minutes.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Always amazing experience!
Always amazing experience! Wouldn't go anywhere else. Very knowledgeable and helpful. Purchased my vehicle here and only trust Henna for any services needed for my vehicle
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Gracie was awesome to work with.
Gracie was awesome to work with. I would recommend Laura gmc to anyone. They had a great inventory of trucks.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
I just got my first car from them And everyone was
I just got my first car from them And everyone was great. I would recommend them to anyone.
Used
2021 GMC Sierra 2500 SLT
Vehicle information
Features
Reviews
Getting you taking care of!
I recommend this dealer to anyone needing a nice used car....I found a nice used 2011 black Lexus IS 250 with only 23500 miles. Terry and Scott helped me find the financing with no pressure even with prior credit issues and let me take time throughout the process
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GMC Sierra 2500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 2500 SLT | 2 Good deals | |
| 2025 GMC Sierra 2500 SLT | $68,902 | 14 Great deals |
| 2024 GMC Sierra 2500 SLT | $62,493 | 75 Good deals |
| 2023 GMC Sierra 2500 SLT | $54,243 | 12 Great deals |
| 2022 GMC Sierra 2500 SLT | $48,820 | 6 Great deals |
| 2020 GMC Sierra 2500 SLT | $42,433 | 9 Great deals |
| 2019 GMC Sierra 2500 SLT | $40,703 | 6 Great deals |
| 2018 GMC Sierra 2500 SLT | $38,175 | 24 Good deals |
| 2017 GMC Sierra 2500 SLT | $35,752 | 21 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 $48,437, with pricing starting at $39,945.
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
10 Great Deals out of 181 listings starting at $42,000
-
GMC Sierra 2500 2021 AT4
5 Great Deals out of 87 listings starting at $29,995
-
GMC Sierra 2500 2021 SLE
3 Great Deals out of 41 listings starting at $33,495
-
GMC Sierra 2500 2021 Base
7 Great Deals out of 34 listings starting at $22,900
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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.