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We have a limited number of reviews for the 2023 Sierra 2500HD, so we've included reviews for other years of the Sierra 2500HD since its last redesign.
5 out of 5 stars

Awesome ridding truck

Jimmy Rawlings, 02/09/2021
2020 GMC Sierra 2500HD AT4 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
9 of 9 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.

Safety
5 out of 5 stars
Technology
5 out of 5 stars
Performance
4 out of 5 stars
Interior
3 out of 5 stars
Comfort
5 out of 5 stars
Reliability
5 out of 5 stars
Value
3 out of 5 stars
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5 out of 5 stars

2020 GMC Denali 2500hd

Mark, 05/12/2020
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
13 of 14 people found this review helpful

Duramax with Allison 10speed super smooth and quick! Great fuel efficiency also !

Safety
5 out of 5 stars
Technology
5 out of 5 stars
Performance
5 out of 5 stars
Interior
4 out of 5 stars
Comfort
5 out of 5 stars
Reliability
5 out of 5 stars
Value
5 out of 5 stars
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5 out of 5 stars

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)
16 of 18 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.

Safety
5 out of 5 stars
Technology
5 out of 5 stars
Performance
5 out of 5 stars
Interior
5 out of 5 stars
Comfort
5 out of 5 stars
Reliability
5 out of 5 stars
Value
5 out of 5 stars
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At a Glance:
  • 6 Colors
  • 2 Trims
  • 6 Packages
  • $42,700starting MSRP
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4 out of 5 stars

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)
7 of 7 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.

Safety
5 out of 5 stars
Technology
4 out of 5 stars
Performance
5 out of 5 stars
Interior
5 out of 5 stars
Comfort
4 out of 5 stars
Reliability
5 out of 5 stars
Value
5 out of 5 stars
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5 out of 5 stars

2500 DENALI

sv, 09/29/2020
2020 GMC Sierra 2500HD Denali 4dr Crew Cab 4WD SB (6.6L 8cyl 6A)
5 of 5 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

Safety
5 out of 5 stars
Technology
5 out of 5 stars
Performance
5 out of 5 stars
Interior
5 out of 5 stars
Comfort
5 out of 5 stars
Reliability
5 out of 5 stars
Value
5 out of 5 stars
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