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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
2020 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.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Dvonte Muhammad reach out to me & his manager helped me
Dvonte Muhammad reach out to me & his manager helped me get my credit and truck fast very friendly as well . Definitely recommended
Great Diesel truck when emission sensors work
Great vehicle for pulling my fifth wheel RV which weighs around 20,000 pounds. This dually truck pulls the RV very nicely without any significant strain on the engine or the transmission. However, like all of today's diesel engines there are 4 different system of emissions on this truck. Each one of these emission systems has sensors associated with them. If one of these sensors goes bad the truck will not perform optimally and sometimes it will go into the limp mode. Unfortunately this is not unique to GMC trucks. All manufacturers are battling this system. Also, I have had to take the truck to the dealer for computer upgrades in order to improve performance. I wish these upgrades could be performed on line (through wifi or with my own phone service). It sure would make things a lot simpler and improve the through put of the dealers who are already strained because of the limited number of available diesel mechanics.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Excellent overall experience
I was truly impressed with my service. They were professional, courteous, and knowledgeable. My vehicle was repaired in one day. I will use this company again.
Great car for work!!
Comfort, ease of driving, style, convenient for work and we LOVE the tailgate! Great for towing our heavy fifth wheel and our dogs are riding in style!!






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
These guys rock.
These guys rock. Best place to buy a car. And chandler is amazing.. loved how well they took care of me
Great luxury ride with great pulling capabilities.
The Texas Edition combined with the X31 package and premium SLT makes a very nice combination. The Sierra 3500HD gives you a luxury interior and ride with all the capabilities of a great pulling truck. The Duramax is quiet yet powerful. It is no doubt the best of trucks for 2020.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Great Dealership
Golden Makes the ownership experience easy! The customer comes first when shopping here and having your vehicle serviced!
Really impressed with the performance
Nicest truck I have ever owned preforms great with my RV Truck is comfortable and still works great when you need it to preform. Ride is nice and very roomy for all that want to travel with me






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Very easy to work with.
Very easy to work with. It felt like I was buying from people I had known for years.
Good power very comfortable ride
Good power plenty of room the truck has all kind of new technology in it that helps with driving safety and with job performance Awesome






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Good service on oil change
Good service & they explained what they checked and that everything was good on the vehicle






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I Had an amazing time thanks to george, everything went
I Had an amazing time thanks to george, everything went smoothly. I Love my vehicle. 😊






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I bought a Ford Maverick from Labelle ford, in 2023.
I bought a Ford Maverick from Labelle ford, in 2023. At the time I promised I would get my car serviced even though it is 40 miles from my home in Fort Myers. On Friday I brought my car for a recall and an oil change. I was very disappointed that the assistant service manager lied to me and didn't even bother to show up for work. I wanted to cancel my appointment because Sam Galloway Ford called me and begged me to bring the car there. Ralph the district service manager and stepped in and promised me that he and Andrea the service manager would walk my car through the recall issue totally. Ralph was great, he even gave me his personal cell phone number, to give him a call whenever I bring my car for service, and he will make sure the car gets treated with respect. Thanks to Ralph and Andrea, I will continue to highly recommend the drive from all my friends in Fort Myers, IT'S WORTH THE DRIVE TO LABELLE.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Amazing customer service!
Amazing customer service! Absolutely the best car shopping experiences we have ever had. Within 2 days Katie Lansford found the perfect truck and need the perfect deal happen! We never even stepped foot in the dealership! This girl worked non stop to find what we needed and make it happen! It’s 100% worth the drive! All other dealers are a waste of time! If you want it done quick and done right, shop with Roger Williams!






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Everyone was very helpful and professional.
Everyone was very helpful and professional. Hudson explained options etc thoroughly. thank you very much






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Always able to squeeze in an oil change and welcomed by
Always able to squeeze in an oil change and welcomed by name. Waiting area always stocked with goodies and quiet.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Very good experience.
Very good experience. Very easy to deal with. Very professional in all aspects of the transaction. I would highly recommend ALM Kia South.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Excellent experience at Dallas Lease Returns.
Excellent experience at Dallas Lease Returns. Chris Mikell was great to work with. The entire process was quick and with none of the stress or pressure that often accompanies car buying. I would definitely buy from this dealer again!






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
People were polite and respectful.
People were polite and respectful. Van we looked at several problems and they wanted $3000 more than Kelly Bluebook said it was worth. We didn't make a purchase.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Absolutely the best!
Absolutely the best! Friendly staff. Great service. Will continue to go to Valley Buick and GMC for service of my vehicle and for future vehicle purchases






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I bought a 2022 F250 from Blasius South, Victor C was
I bought a 2022 F250 from Blasius South, Victor C was great to deal with, the whole interaction was flawless, id definately come back again, very happy with my truck






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I recently had the pleasure of trading in and purchasing
I recently had the pleasure of trading in and purchasing my 2nd vehicle in 3 years from George Gregory at Sawyer Lyons GMC. Every time I visit this dealership (for service or sales), I feel welcomed and valued. George, who has always been both friendly and professional, always takes the time to say hello and that leaves a lasting impression on customers During the sales process, he has never pressured me into making a decision but instead encouraged me to take my time and ask questions. What really stood out, though, was his commitment to ensuring I got the best deal possible. He worked with the finance team to offer competitive pricing and tailored options that fit my budget. Throughout the negotiation, he was transparent, honest, and made sure I was comfortable with every step. Because of my experience with George, I feel confident in my purchase, not just because of the great car I was driving off with, but because of the exceptional service I received. It's rare to find a car salesman who genuinely prioritizes customer satisfaction over making a sale, but this one certainly did. If you're in the market for a new vehicle, I highly recommend working with him—his professionalism and customer-first attitude made all the difference.




Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
My Experience with a great dealership
We will all have a few bumps in the road when it comes to car repairs. Donny my customer service specialist at Chevy has helped with making great suggestions on repairs. I don?t worry about to many repair cost at this moment because I have a warranty so it?s been easy to deal with. If part department just so happen to order the wrong parts for your vehicle, don?t take it out on the service department. Stay patient with them and they will promptly fix the situation and make it right.






Used
2020 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Amazing service by David.
Amazing service by David. Quick and easy process. Will purchase again from this dealership. From contact to signing paperwork it was made easy and quick.
GMC Sierra 3500 prices by year
Model year | Prices from | Deals |
---|---|---|
2025 GMC Sierra 3500 Denali | $73,998 | 6 Great deals |
2024 GMC Sierra 3500 Denali | $59,111 | 132 Good deals |
2023 GMC Sierra 3500 Denali | $49,897 | 9 Great deals |
2022 GMC Sierra 3500 Denali | $285 | 11 Great deals |
2021 GMC Sierra 3500 Denali | $46,599 | 8 Great deals |
2019 GMC Sierra 3500 Denali | $29,500 | 46 Good deals |
2018 GMC Sierra 3500 Denali | $32,995 | 23 Good deals |
2017 GMC Sierra 3500 Denali | $28,900 | 9 Good deals |
2016 GMC Sierra 3500 Denali | $24,250 | 8 Good deals |
About the 2020 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 2020 GMC Sierra 3500 Denali cost?
The 2020 GMC Sierra 3500 Denali price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2020 Sierra 3500 Denali is $56,936, with pricing starting at $37,995.
What are some similar vehicles and competitors of the 2020 GMC Sierra 3500 Denali?
The 2020 GMC Sierra 3500 Denali compares to and/or competes against the following vehicles:
Is the 2020 GMC Sierra 3500 Denali reliable?
The 2020 GMC Sierra 3500 has an average reliability rating of 4.9 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2020 Sierra 3500 owners.
Is the 2020 GMC Sierra 3500 Denali a good truck?
Below are the Cars.com consumer ratings for the 2020 GMC Sierra 3500.
- Comfort 4.9
- Interior 4.9
- Performance 4.9
- Value 4.7
- Exterior 5.0
- Reliability 4.9
100% of drivers recommend this car
- Comfort 4.9
- Interior 4.9
- Performance 4.9
- Value 4.7
- Exterior 5.0
- Reliability 4.9
*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 2020 Denali
27 Great Deals out of 112 listings starting at $37,995
-
GMC Sierra 3500 2020 Base
3 Great Deals out of 28 listings starting at $27,950
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