GMC Complaints

2023 GMC Sierra Duramax Diesel with 10 speed Allison Transmission with 28,000 miles can't be driven. Currently at the dealership due to a transmission valve body problem, codes P0700 & P0747. While driving I felt a hard shift and the truck jerk. The engine light came on and my truck went into low power mode. Let it sit over night and truck would shift fine. This happened 3 times over a 1 month period. After getting to the Chevy dealer they told me the issue is with he valve body and said they have been having multiple trucks come in with the same problem. They have a truck in there since May (4 months!) They told me there is no ETA for the part. I've read this is a common issue happening on 2023 & 2024 trucks like mine. I've read that the problems have been going on for over 1 year. This is ridiculous for a $90,000.00 truck. GM should be putting new transmissions in them or buying the trucks back. I'm considering contacting an attorney to inquire about the lemon law or what other avenues I can take regarding getting the truck fixed, and fixed properly.

I found out that the frame was rusted through beside the gas tank and was told there was a memo put out to the dealers that there was a problem with the frames not being coated properly and if the customer notice it they were to repair it. My truck was service regularly and undercoated regularly by the dealer the body is rust free but I am being told the frame is on safe and can't be repaired and GM will not make it right even though they knew there was a problem. I pull a travel trailer and if the frame was to break in half I am sure someone would be seriously hurt or killed.

Rack and pinion went out and installed a new oem remanufactured one from GM directly. The dealership programmed it but it is facing the same issues for the steering going out at low speeds. The recall was already performed but on the old part. GM Program # N172085440 In the parking lot it goes out and I was driving and slowing down for a turn when the steering went out for 3 seconds going 15 mph then returned.

Safety Issue: Headlights and running lights flicker off and on every 1-2 minutes.

My steering wheel locked while driving. This has prevented me from turning the wheel AT ALL (100% completely locks while the car is in motion). The locked steering wheel lasts approximately 15 seconds. This has happened multiple times over a few month period. I took it to GMC who couldn't replicate the issue and said that GMC no longer makes the steering column assembly component, which they aren't sure would fix the issue, so there was nothing they could advise be done other than sell the car or spend a lot of money on diagnostic fees, which they said they wouldn't do if it were them. My safety and those around me were put at risk because I lost steering function while the car was in motion. The only option was to break and stop the vehicle. There were no warning lights or other indicators to alert of an issue.

The vehicle has been in the dealership from where it was bought numerous of times for the same problem. Transmission shifts very hard from one to two and Has lots of slippage. Dealer recommended a transmission flush and it did not fix the problem. They would keep telling me that the transmission is normal for slipping and slamming hard while changing gears. I’ve been to multiple shops and nobody seems to know how to give me a correct answer or guide me on how to fix my problem.

Headlights intermittently flicker when on sitting still or driving. This happens from a couple of times a minute, up to 5 or 8 times a minute. Other drivers are flashing their high beams at me because of this flaw. I can see a road rage incident occurring because of the issue.

Headlights flickering while driving. And it is quite noticable and distracting to other drivers. I feel this could cause accidents. I have been flashed by upcoming drivers due to them thinking I turned on my bright lights. And this is constant at 2 to 5 minute intervals. The dealer can't fix cause GMC doesn't know how to fix. And neither GMC or the dealer is going to contact me when there is a fix. The dealer said call every 2 weeks and they will check on line for any updates for the problem.

The Headlights flicker, mostly noticeable at night. They do not remain a steady beam of illumination. This is a major distraction and noticeable by other drivers as well as I have been asked not so kindly by another driver, why I keep flashing my lights at them. I have had this vehicle at the dealership for over a month, waiting for a repair. This is a brand new vehicle and should not have this kind of defect in the lighting. I need my vehicle fixed.

1 Adaptive cruise stopped me several times for no reason as there was nothing on the interstate and the weather was clear. This was very jarring at 80 miles per hour on the interstate created a hazardous and dangerous driving condition as cars were all around, almost was rear-ended. 1a Adaptive cruise started all the sudden when I was stopped at an intersection almost caused a wreck, as soon as I took my foot off the break it speed up, but I was able to veer off and break several more times. The adaptive cruise should automatically go off when the brakes are applied. 1b Cruise control will not activate sometimes (it is intermittent). 2 Sensors do not work properly and do not go off to warn if I have driven to close to something, this has happened several times after I became aware of it and after front bumper was damaged. 2 Garage door opener works sometimes, this means I have to get out unlock the house go shut the garage door and relock the house... very unsettling. 3 Android Auto goes out continuously and will not reconnect even though the maps are still on my phone and everything is setup correctly. This also creates a hazardous condition when driving on the highway in unfamiliar areas causing me to miss turns and unable to navigate through traffic. 4 Seat, adjustable setting does not work when entering the vehicle, only upon exit. 5 Mirrors do not automatically fold when parking the vehicle as they did when I purchased the GMC. 6 Rearview camera doesn't turn off automatically after reverse parking has to be done manually while driving. There are so many issues with this vehicle. I have serious concerns with the safety of this Yukon. I have filed a lemon law with GM on the Yukon. The GM representative Lied in the abrtration stating there was a recall that would fix these issues....The dealer was notified within a week of the purchase but had me wait until GM had a software fix.... They stated the software update should take care of all the issue