Used 2015 GMC Sierra 1500 Consumer Reviews
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Tranny Issues
Scott Peterson, 07/27/2016
2015 GMC Sierra 1500 Denali 4dr Crew Cab 4WD 5.8 ft. SB (5.3L 8cyl 6A)
11 of 13 people found this review helpful
I bought the truck new, within 5000 miles there were Transmission Issues, they replaced the whole thing with a brand new one, GMC wanted to see it !! within 2000 miles there were the same issues with this one, now a 2nd new transmission, within 3000 miles the tranny was acting up again !!! they wanted to replace it I said NO, I want a different truck 3 months of battling with GMC it cost me 2800.00 more to get a different new truck, I had less than 10,000 miles on a brand new truck !! now with 35,000 miles on my business partners same truck he has just had his transmission replaced and after 2000 miles he needs it replaced again, theres something wrong with the 2015 6 speed transmission, I'm worried now that my new truck with 20,000 miles on it will have more problems shortly, I've been a GMC customer for 30yrs and will continue, but they have issues with this 6 speed transmission, and they will for quite awhile.
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Transmission replaced at 7000 miles
Andre Marrufo, 09/07/2016
updated 09/10/2019
2015 GMC Sierra 1500 SLT 4dr Crew Cab 4WD 6.5 ft. SB (5.3L 8cyl 6A)
10 of 12 people found this review helpful
The 8spd transmission in this truck went out at 7000 miles. Had to be in shop 3 different ocassion for them to realize it needed to be replaced. The two previous times they reprogrammed and made me put 500 miles on it before saying it didn't work. GM needs to make it right to all its loyal customers. So hopefully this transmission will not fail. Please do yourself a favor and stay away from these trucks till they fix the issues. After the new transmission I had issues again so I traded it in and lost all my money I had put down on it. This trucks trade in value was not very good. Plus the times it had been in the shop were on record so they couldn't certify it thus less money for trade.
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I was going to buy a Suburban...
Al, 11/21/2015
updated 11/26/2018
2015 GMC Sierra 1500 Denali 4dr Crew Cab 4WD 5.8 ft. SB (5.3L 8cyl 6A)
7 of 8 people found this review helpful
Went to the dealer thinking new Suburban I ended up with a Sierra Denali! Briefly stated, I have had Suburbans for 20+ years to haul materials for my business and personal use i.e. hauling black labs, gear for various outdoor adventures, etc. I actually have used a Suburban for what the vehicle was initially intended! Unfortunately, the new recently redesigned Suburban is an engineering disaster for folks like me. The rear storage area is much smaller and chopped up. Also, if you have to crawl in the back you darn near need a ladder to get in. It's clear that GM has targeting soccer moms for the new Suburban. It's strictly a people hauler...period! So, I just happened to look at a Sierra Denali crew cab pickup. After a test drive, I was ready to buy. The back seat area is roomier than a Suburban and will seat 5 comfortably. I could go on and on, but the bottom line is I love this vehicle. Best of all, it cost far less than a comparably equipped Suburban!
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2015's are a Lemon Law Case waiting to Happen
Pissed Customer, 11/16/2016
2015 GMC Sierra 1500 SLT 4dr Crew Cab 6.5 ft. SB (5.3L 8cyl 6A)
9 of 11 people found this review helpful
Stay away .... Been to the "GM Certified Dealer" shop 8 times since I put 30,000 mi on it. It started a shutter at 30-60mph not this thing shakes and shutters so bad at all speeds. Had two separate transmission repairs... TCM Control replaced twice and transmission flush. Do yourself a huge favor and do not buy a GM Sierra/Silverado 2014+ as they have nothing but horrid transmission issues. Also repaired on my truck was the split bench started shifting side to side. Driver Seat had to be repaired because it swayed back and forth on turns. Headlights are also very poorly engineered. Zero visibility in dark conditions.
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Looks so good but just so awful
Andrew Morabito, 07/18/2015
updated 01/20/2017
2015 GMC Sierra 1500 Denali 4dr Crew Cab 5.8 ft. SB (5.3L 8cyl 6A)
20 of 27 people found this review helpful
This is my third 14/15 with the first two being lemons. Well it looks like ill be able to make lemonade pretty soon. The quality of these trucks as awful. My truck has 7000 miles now and is on its second transmission and second rear end. The transmission blew at 6500 miles. The rear end went at 7000 miles. The vibrations from the truck are horrid for a truck that stickers at $62,000. Aside from all the driving issues with the truck, unfortunately the list goes on. The GMC IntellaLink is a joke. It doesn't understand basic Bluetooth commands such as a persons name. It will not understand street names for the nav. Its basically useless. The collision warning is downright dangerous, if you are driving on a slight incline, and it picks up a shadow (like from going under a bridge or something) it activates and tells you are going to crash. Now imagine it that activated the brakes??!!! You would crash or at least be rear ended. On the exterior lets start with the lights, you literally can not see at night and if its raining, forget it you have a better shot of hitting the lottery than seeing what's in front of you. Poor panel fit on the front bumpers expose the locking tabs. The plastic skid plate vibrates when you shut the doors making the truck feel cheap. This review is not to blast GM and is not a rant, its for you the consumer. These trucks are awful to drive. I don't ever look forward to driving this truck having the fear that its going to break down in the back of my mind. This truck has the 8 speed transmission and the 6.2L and its quick but the downside of the transmission and general driveline whiplash and vibrations take away from the fun of having 420HP pretty quick. They make trucks for a nickel now (in Mexico) and have the walnuts to ask you for upwards of $60,000 for the "high end" truck... get out of town GM with this garbage. You should be embarrassed with this product you put out knowing of all the problems. The general public should not be your beta testing group. Last thing I will say to you the consumer, go onto any forum GMC/Chevy and type in "problems" and you will get a 50+ page list of issues. Good Luck After now 27000 miles the truck is undrivable. Gm won't fix the truck. The transmission slips in all gears and the rear end bangs so hard when it shifts it actually activates the traction control. This is by far the worst truck I have ever owned. Gm does nothing to make it right and blames the consumer for being "uneducated" on newer vehicles. I can't tow my snowmobiles with any confidence with this truck. If you use this truck for "truck" things, or any performance at all, this is not the truck for you.
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