Our 2021 GMC Sierra 2500HD Denali brings together serious heavy-duty capability and top-tier luxury-powered by the legendary 6.6L Duramax Diesel and elevated even further with the Denali Ultimate Package. This truck works hard, looks sharp, and rides like it means business.
Denali Ultimate Luxury Premium leather interior, real wood trim, heated and ventilated front seats, heated rear seats, head-up display, and exclusive Ultimate badging that sets it apart from the rest.
6.6L Duramax Diesel Power Massive torque, confident towing, and rock-solid highway manners. Whether its a job site, trailer, or long haul, this Sierra doesnt flinch.
Advanced Technology Large touchscreen infotainment, navigation, premium Bose audio, wireless connectivity, surround-view cameras, and smart trailering tech designed to make heavy work easier.
Safety & Driver Confidence Blind-spot monitoring, front and rear park assist, backup camera, lane departure warning, and GMCs proven safety engineering.
Bold Denali Presence Signature Denali grille, polished wheels, chrome accents, power running boards, and a commanding stance that lets everyone know this isn't your average HD truck.
Why Buy from Flow Automotive:
At Flow Automotive, buying pre-owned is always Easy, Transparent, and Fun! No gimmicks-just clean vehicles, clear pricing, and a process that respects your time.
If you want maximum capability wrapped in full-size luxury, the 2021 Sierra 2500HD Denali with the 6.6L Duramax and Ultimate Package is the right tool for the job. Come see it before someone else puts it to work.
Certified. GMC Certified Pre-Owned Details:
* Warranty Deductible: $0
* 24 months/24,000 miles (whichever comes first) Certified Pre-Owned Scheduled Maintenance Plan and 3 days/150 miles (whichever comes first) Vehicle Exchange Program. SiriusXM 3-month trial subscription
* 172 Point Inspection
* Vehicle History
* Limited Warranty: 12 Month/12,000 Mile (whichever comes first) from certified purchase date
* Transferable Warranty
* Powertrain Limited Warranty: 72 Month/100,000 Mile (whichever comes first) from original in-service date
* Roadside Assistance
** All of our cars go through a comprehensive QRP Quality Renewal Process. Come check out Flow GM Auto Plaza's No haggle, No Pressure, Transparent, Easy, Fun, car shopping experience!! We have the most professional and courteous sales staff in North Carolina. Call our Internet Sales Dept at (336) 760-7077 to schedule a test drive, or visit https://www.flowauto.com . Thank you for allowing us to serve your automotive needs over the past 50 years.
Certified Pre Owned 2021 GMCSierra 2500 HD Denali
- Exterior Color
- White Frost Tricoat
- Interior Color
- DARK WALNUT/DARK ASH GREY, FORGE PERFORATED LEATHE
- Odometer
- 65,232 miles
- Transmission
- Automatic
- Drivetrain
- 4WD
- Engine
- Engine: 6.6L V8 DuraMax Diesel, Turbo
- VIN
- 1GT49REY0MF216668
- Stock Number
- 1G8125A
Included Packages & Accessories
Detailed Specifications
- Max seating capacity: 5
- Fuel System: Direct Injection
- Fuel tank capacity: 36 gal
- Horsepower: 445
Dealer Notes
KBB.com Consumer Reviews
- 2.0
Transmission trash
By Jason on Monday, April 07, 2025
Bought a 2023 GMC Duramax diesel Sierra SLT had it for two years hit 50,000 miles. The throttlebody broke went in for service. Got it back three weeks at 62,000 miles now my transmission is slipping. I travel back-and-forth from South Carolina to North Carolina for work daughter’s truck would be my forever truck. What a joke Hundred thousand dollar truck junk - 3.0
Infotainment system unreliable!
By Brian C on Friday, June 27, 2025
The servicing dealer has been great, the GM engineers not so much! The truck will without warning have no sound for the radio and the blinkers. GM told the dealership to reprogram then when that didn't work they said replace the amplifier and when that didn't work, they said replace a module, and when that didn't work they said to replace the amplifier again, and when that didn't work they said we know it's a known problem but we don't know how to fix it. All of this with less than 9k miles. The dealer has done everything that GM has asked them to do, but none of it works. It's very frustrating to pay this much for a truck and you can't get the radio to stay working. It also got away from the factory with paint damage and a dent in the hood,( the dent is from the inside out on a double wall). I thought I was upgrading when I went from a F250 Lariat to a Denali, but I may have traded one headache for another. - 5.0
Fantastic truck
By Jjj on Sunday, November 07, 2021
This one of the most solid vehicles that I have ever driven! The 401 hp engine is more than enough power and the transmission is smooth! Highly recommend this truck!
Images are for illustration purposes only.
Please note that we strive to provide accurate pricing at all times. However, pricing is subject to change at any time due to market availability, manufacturer incentives, and the installation of dealer-installed options. Unless otherwise stated, pricing does not include taxes, license, or $799 administrative fee. All pricing must be verified and finalized with the Sales Manager before purchasing. We recommend that you do this in person during your test drive visit so that all applicable incentives and options can be thoroughly explained