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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 3500 Denali 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.






Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Bill Gramann, the finance, and insurance team were
Bill Gramann, the finance, and insurance team were wonderful to work with. They made the process of buying a car timely, professional, personable, and easy! Would highly recommend Bill and his team!
Truck is a Solid vehicle overall.
Has a really Big feel to it. I currently use mine to pull gooseneck trailer. I haven't had a load yet that I couldn't pull. The downsides to this truck is to me I feel it could get better fuel mileage. Also I had trouble with #4 injector...dealership replaced it. Now my AC doesn't work all the time. Although it sounds like it's blowing it isn't.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Very prompt response.
Very prompt response. Gave me all the details I needed. Follow-up has been very good
Love it.
I love the new features this truck offers. I would highly recommend this truck if your looking for a Diesel. I provides all the features and benefits you would want.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Bill was fantastic to work with!
Bill was fantastic to work with! Whole process took only a couple of hours and everyone was very helpful. Pricing was transparent and they worked with me to get me best interest rate possible.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
The sales people where very friendly and helpful, the
The sales people where very friendly and helpful, the Parts Department was also very helpful helping me purchase new floor mats and a bed mat, even installed them for me free of charge.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I had made the mistake of scheduling a service
I had made the mistake of scheduling a service appointment at the Salisbury dealership but my appointment was at the Lexington dealership what a blessing it was they waited on me which they didn’t have to so glad they did they saw something the needed attention and took care of it I could go on and on but I want just saying they treated me better than I expected I will drive further to go there even if the other ones are closer






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Easy process.
Easy process. Dmytro was very helpful and accommodating. Follow up was timely. Found the car I wanted online, submitted a request for information, received a call back immediately.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Service department is top notch.
Service department is top notch..best of the best! Friendly yet professional, capably handled my every concern. Ride to/from my office very nice and appreciated touch!






Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Our experience was 5star!
Our experience was 5star! We picked this dealership because they had such a huge selection of F450 diesel trucks. From the moment we arrived and was approached by salesman DW, our experience only got better. He was knowledgeable, attentive and took great care of all of our needs. We had the spray in bed liner and retractable cover added with their customization shop and all was on point. I can’t say enough about the dealership and DW…the absolute best experience buying a vehicle!






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
We couldn’t be happier with our experience at Bellingham
We couldn’t be happier with our experience at Bellingham Nissan! We drove three hours to purchase our brand-new 2025 Nissan Frontier Pro-4X, and it was absolutely worth it. Chanel and Forest provided outstanding service from start to finish—quickly responding to all our questions via the website chat and text, helping us lock in the pricing we wanted, and making sure everything was seamless when we arrived. In person, they were just as fantastic! Over two days, we went on multiple test drives, asked tons of questions, and never once felt rushed or like we were a bother. Their patience, knowledge, and genuine helpfulness made the entire process enjoyable. We left with our new truck feeling excited and completely confident in our purchase. We’ll definitely be stopping by to say hi when we’re in Bellingham again! If you're looking for a stress-free, friendly, and helpful car-buying experience, we 100% recommend reaching out to Chanel, Forest, and the team at Bellingham Nissan!






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Service was good , got my truck in and out quickly .
Service was good , got my truck in and out quickly . Was pleased that I got it back right away.






GMC Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Bought a new truck from Nate.
Bought a new truck from Nate. Great to work with simple and easy. Will definitely trade with them again. Thanks again, Cary Tietjen






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I just purchased a car from DriversMart my salesman
I just purchased a car from DriversMart my salesman Cristhian Rojas was very helpful he welcomed me and helped me with all details that I needed to know I thank him very much. I recommend anyone to purchase a car at Driver’s Mart thank you.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
CJ was the deciding factor ,made my purchase worth the
CJ was the deciding factor ,made my purchase worth the 400 mile trip to purchase the Ram






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Great service !
Great service ! Victor Sanchez, as my service advisor has always been professional and courteous. He keeps me updated via texts and sends a detailed message regarding the required services to be done and estimates. Complete transparency!!






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Great experience!!
This is a very efficient crew from start to finish! We found a car on line and they met our schedule from start to finish to allow us to find the car of our dreams. Excellent value and we are so glad we found Tiffany, Mark and the entire crew. 100 per cent positive from start to finish. Thank you Dale and Nancy Reisbeck






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Enjoyed my overall experience
Having purchased only new vehicles my entire life, I found myself in need of buying my girlfriend a certified used vehicle from a local Honda dealership. After the salesman ignored our desires and instead try to upsell us, however, we decided to try Carmax instead. From the start, Carmax offered a helpful hand online and friendly service over the phone: they were quickly able to find what we needed and provide attractive financing in a flash. (Thanks to you, Lesly.) Moreover, I found scheduling of a meeting to finish the deal at the dealership efficient. Once at the dealership, Haseam did well in helping us -- his knowledge and friendliness were impressive, especially since I havevworked in the service industry for many years . Because he did not try to upsell us, but rather did his best to educate us on what would work well, (coming in on his day-off to finalize the deal), I must commend Carmax and its associates for providing a memorable experience. Also, I was thankful that Dashau helped expedite the process when we completed the paperwork; what a breeze! Finally, I know I will come in buy my own used car in the future when my Honda Fit finally gives out. Thanks again, Carmax!






Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Kevin Smith/Robbie Peters some of the two best if not the
Kevin Smith/Robbie Peters some of the two best if not the best car salesmen, very professional and very curdious, very helpful car salesmen that I have ever had experience with. If your looking to buy a car or anything contact these professionals that truly have your best interest at heart. I applied for credit on a Wednesday and was in a truck by Friday There was no bull or any run around, straight to the point and professional. So look no further when you contact them. Will recommend to everyone to contact them. - R. Wey






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
13 Silverado
Always Great service provided . I have bought 3 new vehicles for them .






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Couldn't be more pleased, Brandon the sales manager
Couldn't be more pleased, Brandon the sales manager actually took care of us from start to finish. There was no hi pressure sales, no back and forth and no games. It honestly was relieving. He helped me with financing and had me out the door in less than one hour. I'll definitely be back and highly recommend.
GMC Sierra 3500 prices by year
Model year | Prices from | Deals |
---|---|---|
2025 GMC Sierra 3500 Denali | $71,301 | 9 Great deals |
2024 GMC Sierra 3500 Denali | $58,995 | 10 Great deals |
2023 GMC Sierra 3500 Denali | $48,999 | 15 Great deals |
2022 GMC Sierra 3500 Denali | $49,990 | 8 Great deals |
2020 GMC Sierra 3500 Denali | $40,995 | 12 Great deals |
2019 GMC Sierra 3500 Denali | $29,500 | 6 Great deals |
2018 GMC Sierra 3500 Denali | $38,599 | 26 Good deals |
2017 GMC Sierra 3500 Denali | $31,441 | 8 Good deals |
2016 GMC Sierra 3500 Denali | $23,945 | 10 Good deals |
About the 2021 GMC Sierra 3500 Denali
Base shown (base trim).
- Seating
- 2
- 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 3500 Denali cost?
The 2021 GMC Sierra 3500 Denali price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 Denali is $59,411, with pricing starting at $46,631.
What are some similar vehicles and competitors of the 2021 GMC Sierra 3500 Denali?
The 2021 GMC Sierra 3500 Denali compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 3500 Denali reliable?
The 2021 GMC Sierra 3500 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 3500 owners.
Is the 2021 GMC Sierra 3500 Denali a good truck?
Below are the Cars.com consumer ratings for the 2021 GMC Sierra 3500.
- Comfort 4.5
- Interior 4.5
- Performance 5.0
- Value 4.0
- Exterior 4.5
- Reliability 4.0
100% of drivers recommend this car
- Comfort 4.5
- Interior 4.5
- Performance 5.0
- Value 4.0
- Exterior 4.5
- Reliability 4.0
*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.
GMC Sierra 3500 trims
-
GMC Sierra 3500 2021 Base
2 Great Deals out of 27 listings starting at $13,795
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