Used 2020 GMC Sierra 2500HD Consumer Reviews
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Love the looks, love the power, love the economy
Rick B., 03/18/2021
2020 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
18 of 18 people found this review helpful
I purchased a 2020 Sierra 2500HD AT4 (Duramax) in November of 2020. This thing is a BEAST and a joy to drive. I've put almost 131K miles on it thus far and have not had a single issue. IMHO, the interior is better than a Ford but trails behind the Dodge. However, just because it seems less capable with technology isn't necessarily true. I have physical switches for many things that the Dodge incorporates in their big screen. I MUCH prefer the switches because I don't have to go through electronic pages to find what I'm looking for. The seats are a bit hard but are very supportive. I'm averaging a 21mpg with it at this point but the majority (80%) of my driving is highway speeds. In an attempt see just how good of gas mileage I could get, I drove a cruise controlled speed of 55 mph on a VERY flat 2 lane road for a little over 75 miles. My results, 29.3mpg, yep, you read that right. As I get up to interstate cruising speed it's much closer to 22mpg. I have hauled my 6,000 pound boat a couple of times with it and it still gets around 14mpg. Speaking of hauling the boat, this thing tows like a dream. The cameras, mirrors and tow-haul mode work great and if I couldn't see the boat in my mirrors, I would hardly know it's there. The voice command menu and responsiveness is great, no issues with it and it has always recognized what I'm asking for. The Bose speakers produce more than I can listen to, and the cab is quiet enough for conference calls when I'm travelling for work. The in-cab outlet is perfect for charging my laptop on the go and allows my wife to use the computer when we travel without killing the battery. I put a hardcover on the bed but with the multipro tailgate I rarely have to do anything with it, and I make a LOT of trips to the lumber yard for 8'+ lumber. All I have to do is drop the upper portion of the tailgate and the long lumber slides right in and is safe and secure. One thing I would criticize. It doesn't match up when compared to the other makers off-roading capabilities (manual/push button locking differentials), but I didn't really buy it for that. If you want something to do some relatively challenging off-road cruising, look elsewhere. I could go on, but suffice it to say that I LOVE this truck and would absolutely recommend it without hesitation.
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Awesome ridding truck
Jimmy Rawlings, 02/09/2021
2020 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
24 of 25 people found this review helpful
If you want to go from a 1/2 ton to a 3/4 ton for towing your larger than 30’ travel trailer, this is an excellent choice. The new 6.6 gas motor will give you convenience towing any bumper pull trailer. If pulling the heavier 5th wheel trailers you probably want to go with the diesel. This truck with the gas motor rides really nice towing and empty. Don’t expect 1/2 ton gas mileage. I’m getting around 15 -16mpg highway and 12-14 city. My last truck was a 2011 6.2 Ltz 1/2 ton some performance upgrades. Long tube headers ,cold air intake levelling kit and larger tires with 20”wheels. I was getting about the same gas mileage . But had to use premium gas. When towing my 30’ travel trailer the 2500 gets between 9&10mpg (based on a 1500 mile round trip) I have owned 7 gm trucks over the last 40 years, all purchased new except 2 that were low mileage. All gas V8s, and never had any motor or transmission problems. Towed boat,snowmobile,cargo,utility,tent ,horse and travel trailers over the years. Hopefully this helps anyone trying to decide if this is the right tow rig for you. Ps I worked on the line in gm Oshawa for 46 years,if you were wondering why all the gm trucks lol.
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2020 GMC Sierra 2500HD for sale near you
Showing 3 of 24 listings
- Denali Diesel Crew CabMSRP: $57,95916 mi away
- Denali Diesel Crew CabMSRP: $58,9908 mi away
- Denali Crew CabMSRP: $55,59017 mi away
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2500 DENALI
sv, 09/29/2020
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
11 of 11 people found this review helpful
I just traded my 18 GMC 1500 oh what a difference in ride and payload i love it wish i bought the Diesel
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Emission System Issues
Robert in WY, 12/28/2021
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
8 of 8 people found this review helpful
After 43K miles I'm selling my Year 2020, 2500 HD Denali, 6.6 l diesel. Replaced the diesel particulate filter at 20K miles for $1500. The particulate heater (burner) just died at 43K miles for another $1500. Waiting 2 weeks for parts while the truck sits. After 50K miles, I will pay these repair bills instead of GMC. i am on first name basis with service dept. No thanks. I'm out.
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2020 GMC Denali 2500hd
Mark, 05/12/2020
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
17 of 19 people found this review helpful
Duramax with Allison 10speed super smooth and quick! Great fuel efficiency also !
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Great truck
The ultimate truck tester, 05/17/2020
updated 11/22/2021
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD LB (6.6L 8cyl 6A)
21 of 24 people found this review helpful
The truck in itself is wonderful. It uses way too much DEF fluid when pulling a trailer. The stiffer Springs in the rear are causing a rough ride with a trailer. Great power, love the camera system, love the handling, very quiet.
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Best 3/4 ton on the market
Eric, 02/18/2022
2020 GMC Sierra 2500HD SLT 4dr Double Cab 4WD LB (6.6L 8cyl 6A)
5 of 5 people found this review helpful
I've owned and operated many different trucks for either work or home and I'm constantly surprised by the performance, reliability and security this truck has to offer. It wasn't cheap but you really can't put a price on safety and comfort while towing a trailer long distances. The improvements GM made from 2019 to 2020 are significant and would strongly suggest you do your research before purchasing a different truck - they're not all created equal. Buy with confidence. I'm a believer and will never go back.
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The Beast
Brett, 03/06/2020
2020 GMC Sierra 2500HD SLT 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
8 of 10 people found this review helpful
We just Got the new 2020 GMC 2500HD 4×4 Duramax crew cab . Wow what a difference it is compared to my 2018 GMC with all the same features. What a great truck . The team at Piehls GMC in Princeton,IL with CJ,Rob an Harold made the entire process a great experience. Thank you Brett
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Minus 15 000 miles. Broke down.
Sue, 03/24/2022
2020 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD LB (6.6L 8cyl 6A)
8 of 13 people found this review helpful
1000 miles away from home with large camper and 2500 GMC Sierra won't start. We have 2 cats and 1 dog with us. We bought truck for pulling our 5th wheel camper. At dealer for 3rd day. The main engine control module is out. We were told we were lucky they found 1 available. Yeh,, lucky us. We had a 2008 Toyota Tundra that we traded on GMC. It had less than100,000 miles, but we thought since we would be traveling so far a newer truck would be more reliable on highway. We were wrong. We were told yesterday truck would be ready this morning. Now, it's 4:30 pm and still no word. Read your reviews on GMC and keep looking. We only have a couple of days of vacation left and the weather here in Texas only got warm a couple days ago. Oh yeah, they found us a rental but its a Chevy Malibu. Pets aren't allowed in it and we planned on going to beach with dog when it warmed up. We have always had foreign vehicle makes except we bought a HHR. I spent every off day at dealer. Ignition, heater, ac steering wheel, brake. problems. I can't even remember everything that went wrong with it. Don't look to GMC for reliability!
2500 HD GMC Denali 6.6 Gas
Lincolncent, 02/05/2021
updated 08/07/2023
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
3 of 4 people found this review helpful
I love love love my truck. It is stylish, powerful and durable. I am going to pull a 28' camper so I wanted a truck that I felt would do the job. I do agree with some of the other reviews, after many miles the seats are hard but that can be fixed with a lamb skin seat cover. I got a great deal on mine as it was a trade with 3,300 miles on it (guy traded for a Duramax). I would never drive the $10K difference out of it so I'm happy with gas vs diesel. The 6.6 engine has ample power for towing.
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Duramax power
Tim, 12/19/2023
2020 GMC Sierra 2500HD SLE 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
1 of 1 people found this review helpful
Love it,hate having no printed manual, it's all digital now and that sucks! The drivetrain, Duramax Allison combo, is ridiculously powerful. I smile whenever I drive it.
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Cheap interior very uncomfortable. Seats are hard
Andy, 05/10/2020
2020 GMC Sierra 2500HD SLT 4dr Double Cab LB (6.6L 8cyl 6A)
5 of 16 people found this review helpful
Awful interior exterior wins
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Seats are like sitting on a steel pail
Don, 11/05/2020
2020 GMC Sierra 2500HD 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
5 of 16 people found this review helpful
I have a 2020 GMC HD Sierra truck for work could have possibly the worst seats I have ever had have owned GM products for 40 years but after owning this truck could be the last. Overall good truck but interior is Garbage on these plain Jane trucks Ver dissatisfied
Powerhouse!!
Big D, 02/07/2022
2020 GMC Sierra 2500HD SLT 4dr Crew Cab 4WD LB (6.6L 8cyl 6A)
0 of 0 people found this review helpful
Coming from a Ford guy, I’m in love with my GMC 2500 duramax. Awesome truck and super dependable
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The only "Truck"
Paul Gneiser, 03/09/2022
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
0 of 0 people found this review helpful
Top of the line. I've owned RAM 2500's , F250's ect . No comparison
Awesome truck
JM2, 04/28/2022
2020 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
0 of 0 people found this review helpful
Best looking and tows everything I have with ease. Roomy and goes anywhere.
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Sharp Denali
My wheels , 02/25/2023
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
0 of 0 people found this review helpful
Love our sharp mean looking Denali. Very comfortable and goes above and beyond the towing of our equipment. Good storage under the back seat and all compartments. Fold down tailgate is convenient for reaching materials. Stylist interior.
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Awesome experience
Darlene , 02/04/2021
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
0 of 2 people found this review helpful
Love everything about the truck it was a Sierra 1500 Denali
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