GMC Sierra Reviews

Stay away from GMC. I bought new 2025 GMC 3500 Denali ultimate in Oct of 2025 and my transmission just went. I have 8,000 kms on it. I was told that they had addressed the valve body issues in the 2024 & 2025 models but obviously that was not true. I can’t believe that the brand that I have always loved has become the worst make of truck. I am just trying to do the right thing here and stop anyone else from buying any gmc models. They have gone a decade with having transmission issues and are still not fixing them. My old 2011 GMC Duramax with the genuine Allison transmission is still working great at 300,000kms. These new ten speed (not Allison) transmissions are junk and I can’t believe GMC would ever give up the Allison transmission.

I traded in my 2018 GMC Sierra, for a 2026 Sierra. The vehicle had less 94 miles on it at the time of purchase, not even two weeks later the backup camera failed. I was told the part needed to be replaced, it was in stock and they were able to get it (this happened on a Monday). The problem being I live remotely on an island with no GM dealership. I had a ferry ticket to go back home, Friday the same week my camera failed but was told that the part would arrive in two days. The part did not arrive until Friday, I missed my ferry. I have to spend money on a hotel and food for a week to wait for the next ferry. I will be missing work for the week and will lose out on pay. Another expense, pay for gas for the week unless I park and just walk everywhere for a week.

I bought a used beautiful 2019 GMC Sierra 1500 Elevation with 21K miles about 2 years ago. Unfortunately, I didn't notice the transmission kick in engine cold temperature, look it up and yes, they have a sensor temperature problem. Now I have lifters and camshaft at 58K miles. A problem that AFM system causes, just for GM parts $2,500 plus labor, I don't think I will ever own a GMC again, already have too many major problems.

Bought a brand new 2024 3500 Denali, the truck has been breaking down every 3 months since. The most recent breakdowns were in Texas and Colorado. Truck broke down in the Dallas area, transmission completely failed, could not get to Vegas with my haul. Went to 5 dealerships in the area, some were closed on Saturday, some were open with one guy behind the service desk doing nothing. I was told that no technicians were on site and that they will re open only Tuesday. No dealership was able to provide me a courtesy vehicle as well. I still haven got any refund and compensation for that major break down (travel expenses, heavy truck rentals…).

GM EV Concierge Ignored Me After Major Battery Failure – Worst Customer Service I’ve Ever Experienced. Post: I’ve been a loyal GM customer for 20+ years. The way I’ve been treated over the past 2 months has destroyed any trust I had left in this brand. My 2024 GMC Sierra EV Denali suffered a total battery failure at just 3,995 miles. I opened case #** on 5/27/25. Since then, I’ve been lied to, ignored, and strung along by the EV Concierge team.

I have a '21 GMC 1500 Sierra Denali Carbon Pro edition with the baby diesel.. About two months ago my factory 22-in wheel broke in half driving down the road 70 miles an hour, let’s not focus on how dangerous and deadly that could’ve been, I’ve had seven mechanics. Tell me this wheel should be on a recall list that they have never ever in their careers have seen a wheel break the way my wheel has broke. Eight weeks we have been fighting with GM to stand behind their product and all we are getting out of them is that is normal wear and tear.. Ummm excuse me. I’d like to know how I will break it in half is normal. Wear and tear on a four-year-old pick up. All GM is doing is running their name into the ground.

I was a die hard GMC customer 4 weeks ago! Now, I will never purchase another General Motors product in my life!!!! Recently, I discovered that General Motors won’t even back their own products, so how can I have any faith in them??? As a life long supporter of General Motors, I STRONGLY ADVISE you to buy anything other than a General Motors product!! I have a 2021 GMC Sierra 1500 AT4 with a 3.0 Duramax. I have had problems since the first month I bought the truck! They started out small, sensors and emissions, but recently, turned into a $13,300 engine replacement! Truck is only 3 yrs and 11 months old and needs a full diesel engine replacement??

I bought a brand new Sierra AT4 at 11 am Saturday. Drove it off the lot with 4 miles on the odometer. Drove it home approximately 5 miles and parked it in the driveway. Changed my clothes to go to the gym and when I went out to start the truck it wouldn’t start. It would crank and crank but never start. Tried it about 8 times and then gave up. I pushed the OnStar button and arranged for a tow back to the dealer. Needless to say I canceled my financing and took back my trusty F150 that I traded in. I will never again leave Ford for a subpar vehicle like the GMC.

I have owned 7 GMC trucks, my last one is a Denali and although mechanically it's good, most of the trim and luxury items are cheap and cheaply made. Center console handle cut my fingers when the metal plating used started peeling off. Gas intake hose was missing a screw and GM said I needed to replace the whole intake system - that took 2 years to finally get repaired.

I have a GMC Sierra 1500 2022 that has 18,000 miles on it and is meticulously kept. One month ago I left my house and it died in the middle of the road about 200 feet from my home. They towed it to our local GMC dealer and it has been there for one month waiting on a fuel pump. They are apparently on backorder because of the massive problem with fuel pumps. One month is a long time to be without a vehicle. My mother also recently purchased a used GMC Arcadia with 8000 miles on it and it died the day after she got it and it was the fuel pump. As soon as I get my truck back from the dealer, I will be looking for another vehicle and I will never buy a GMC again. We have not received a phone call, not an update, not an apology, as a matter fact the woman at our local dealership was rude to my husband when he asked why it was taking so long. Terrible reliability, terrible customer service. GMC never again.