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Used
2021 GMC Sierra 3500 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.






GMC Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
In and out, very smooth.
In and out, very smooth. No issues at all. The video of the service was pretty Kool. Price is very competitive. All my cars get their service there.
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 Base
Vehicle information
Features
Reviews
Always good service and timely .
Always good service and timely . Scheduling never an issue , always able to work with my appointment time. Waiting room comfortable and accommodating. Always will return for service .
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
James cartwright is the absolute best!
James cartwright is the absolute best! 10/10 will recommended. he was so patient, understanding and very encouraging! refused to let me settle and got me in a 2024 honda accord just like I asked ! he made my first time car purchase experience a breeze even prayed for me! after I got my car he was still working to make sure i have the best rates and benefits and always check in to follow up with me! so grateful he was my salesman:)






GMC Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
During my recent vacation to Reno, I had the pleasure of
During my recent vacation to Reno, I had the pleasure of visiting the local Cadillac dealership, Corwin Cadillac, because I came across a vehicle on their website that I wanted to see in person, as it had the features and was the color I was interested in. I must say it was a delightful experience from the moment I walked in the door and was greeted by their team. Although I didn't end up purchasing a vehicle, my interaction with the salesman, Beau, was truly exceptional. Beau greeted me with a warm smile and a genuine enthusiasm for the Cadillac lineup. He took the time to listen to my needs and preferences, providing insightful information without any pressure to buy. The entire staff at the dealership was friendly and welcoming, so much so that I felt compelled to write a review, despite not actually purchasing a vehicle here. If I lived in the Reno area I would absolutely come to this dealership for my purchase because of Beau's outstanding service and the dealership's positive and honest approach. I highly recommend anyone in the Reno area looking for a Cadillac, Buick or GMC vehicle to visit this dealership and ask for Beau!






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Nathan the salesman was great to work with.
Nathan the salesman was great to work with. Finance through them was fast and easy. Great customer service. Would highly recommend them if you're looking for new or used vehicle






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 Base
Vehicle information
Features






Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
Chris at Interstate Ford was absolutely amazing.
Chris at Interstate Ford was absolutely amazing. He searched his inventory for a vehicle that I could afford. I would shop there again!






Used
2021 GMC Sierra 3500 Base
Vehicle information
Features
Reviews
Joe was awesome about taking and sending videos of the
Joe was awesome about taking and sending videos of the brand new Grand Wagoneer that they got on the lot before photos were even available online. We stayed in close correspondence and in less than a week, we called the new vehicle "ours." We had a. great experience with Joe and the team at Russ Darrow West Bend.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Wonderful experience.
Wonderful experience. The used car was just too expensive for me right now. Josh and Karla have been very professional, cordial and thorough. I’ll be back!!






Vehicle information
Features
Reviews
Service tech was friendly and got me in even though I
Service tech was friendly and got me in even though I didn?t have an appointment. The wait wasn?t long and the price was reasonable. I will be coming back from now for service on my truck. Great atmosphere, friendly staff and fast reliable service.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Jason was upfront, honest and straight to the point.
Jason was upfront, honest and straight to the point. Didn?t play any games. I was offered a fair value for my trade in (unlike other dealerships). I was able to get my trade in and drive away in a brand new vehicle all under 3 hours.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Derek is a friendly salesman.
Derek is a friendly salesman. Excellent customer service. Usually Autonation Ford of Katy has the best options. I bought several new cars in this dealership






Used
2021 GMC Sierra 3500 Base
Vehicle information
Features
Reviews
Excellent service and very respectful in reference
Excellent service and very respectful in reference choices and pricing. Adnan, salesperson, was very helpful and not pushy. Price for the EV Blazer was good. We looked both in Missouri and Florida. Butler won out






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Fantastic Experience!
Had a pleasure doing business with Russell Westbrook CDJR for my new 2021 Dodge Challenger! Zaman, Moses, and Jay worked with me tirelessly to make sure I was happy with the car and our deal for it. This is the second vehicle I've bought from them and I'll definitely be back for a third in the future. Highly recommended!






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
This dealership does a great job of offering a wide range
This dealership does a great job of offering a wide range of used electric vehicles at some of the lowest prices in the Valley. I worked mostly with Angel (and a bit with Eric). Over the course of a few weeks, we narrowed in on the EV that was right for me and that qualified for the $4,000 EV tax credit (which ends September 30, 2025). Both Angel and Eric were personable, professional, and responsive. Ultimately, I found a great car at a great price here, without the haggle of negotiating. Please take care to read through all the fees and warranty offerings. You want to make sure you are purchasing what's right for you. But, I did find the fees + taxes to be outlined in a transparent manner. I'll update this review if I start to have any issues with the car in the immediate future, but so far, this has been a good purchase.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Worked with Chandler great sales person to work with
Worked with Chandler great sales person to work with stayed late so we could pick up our new car at an amazing price by the way! I would definitely recommend to any family or friend to buy from here!






Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
Great companto buy from. I highly recommend them.
They were extremely accommodating. I was under a time constraint. They worked very quickly and efficiently to get the paperwork done so I could make my other commitment. I never felt pressured to buy the vehicle. I was treated great.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Great
Always good service here. They always treat me with courtesy and respect.






Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I contacted Luther Cadillac thru Cars.
I contacted Luther Cadillac thru Cars.com. A representative contacted me within a few mins but I changed my mind about the car and didn't have any more contact with this dealer.
GMC Sierra 3500 prices by year
Model year | Prices from | Deals |
---|---|---|
2026 GMC Sierra 3500 | $2,681 | |
2025 GMC Sierra 3500 | $45,440 | 36 Great deals |
2024 GMC Sierra 3500 | $37,488 | 38 Great deals |
2023 GMC Sierra 3500 | $43,998 | 30 Great deals |
2022 GMC Sierra 3500 | $33,995 | 31 Great deals |
2020 GMC Sierra 3500 | $27,988 | 17 Great deals |
2019 GMC Sierra 3500 | $19,485 | 7 Great deals |
2018 GMC Sierra 3500 | $18,995 | 29 Good deals |
2017 GMC Sierra 3500 | $25,999 | 5 Great deals |
About the 2021 GMC Sierra 3500
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 cost?
The 2021 GMC Sierra 3500 price depends on several factors, including the trim level, optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 is $55,446, with pricing starting at $13,795.
What are some similar vehicles and competitors of the 2021 GMC Sierra 3500?
The 2021 GMC Sierra 3500 compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 3500 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 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
AT4 (2 styles)
Style | |
---|---|
4WD Crew Cab 172" AT4 | 4WD Crew Cab 159" AT4 |
Inventory price | |
Starting at $60,500 | Starting at $60,300 |
Combined MPG | |
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) |
Base (8 styles)
Style | |||||||
---|---|---|---|---|---|---|---|
2WD Double Cab 162" | 4WD Double Cab 162" | 4WD Crew Cab 172" | 4WD Crew Cab 159" | 2WD Crew Cab 159" | 2WD Crew Cab 172" | 4WD Reg Cab 142" | 2WD Reg Cab 142" |
Inventory price | |||||||
Starting at $40,200 | Starting at $43,000 | Starting at $44,800 | Starting at $44,600 | Starting at $41,800 | Starting at $42,000 | Starting at $40,200 | Starting at $37,400 |
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) |
Denali (2 styles)
Style | |
---|---|
4WD Crew Cab 159" Denali | 4WD Crew Cab 172" Denali |
Inventory price | |
Starting at $66,700 | Starting at $66,900 |
Combined MPG | |
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) |
SLE (8 styles)
Style | |||||||
---|---|---|---|---|---|---|---|
2WD Double Cab 162" SLE | 4WD Double Cab 162" SLE | 4WD Reg Cab 142" SLE | 2WD Reg Cab 142" SLE | 4WD Crew Cab 159" SLE | 4WD Crew Cab 172" SLE | 2WD Crew Cab 159" SLE | 2WD Crew Cab 172" SLE |
Inventory price | |||||||
Starting at $45,000 | Starting at $47,800 | Starting at $45,600 | Starting at $42,800 | Starting at $49,400 | Starting at $49,600 | Starting at $46,600 | Starting at $46,800 |
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) |
SLT (4 styles)
Style | |||
---|---|---|---|
4WD Crew Cab 172" SLT | 2WD Crew Cab 159" SLT | 2WD Crew Cab 172" SLT | 4WD Crew Cab 159" SLT |
Inventory price | |||
Starting at $57,600 | Starting at $54,600 | Starting at $54,800 | Starting at $57,400 |
Combined MPG | |||
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) |
*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.
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Research the 2021 GMC Sierra 3500
Compare the 2021 GMC Sierra 3500
GMC Sierra 3500 trims
-
GMC Sierra 3500 2021 Denali
7 Great Deals out of 92 listings starting at $41,988
-
GMC Sierra 3500 2021 Base
7 Great Deals out of 35 listings starting at $13,795
2021 GMC Sierra 3500 by body style
2021 GMC Sierra 3500 by fuel type
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