My vehicle was being driven by my Nanny and had my children in the car, the engine started making a strange noise so she was required to pull over on a busy highway bridge in Tulsa, OK. There was no warning of any issues with the vehicle before this incident. It then would not start and had to be towed to a GMC Dealership in Broken Arrow, OK. They informed me the entire engine is locked up and has to be rebuilt.

- Claremore, OK, USA

Motor locked up and went into neutral on it-??s on driving 60mph. I was able to restart the vehicle and then it completely shut down at red light in a main intersection.

- Chunchula, AL, USA

Vehicle suddenly lost all power at speed, coasted to a stop. No waring indicators, stopped in a lane of traffic, speed limit was 55mph. Engine is now seized.

- Palatine, IL, USA

While driving the 370 miles from Fairbanks to Anchorage with our family and dogs, our vehicle shut down completely with no warning. The drive is through a very remote section of Alaska. While passing a slower vehicle, our Yukon completely shut down, to include the all controls including the dash and lights. We were unable to complete the pass, leaving us in direct line with on coming traffic with no ability to speed up to get around the other vehicle. The other vehicle, not knowing we had lost all power, continued driving the same speed and eventually we were able to get back into the proper lane and coast to a stop on the side of the 2 lane highway. The vehicle would not start and with the temperatures outside at 12 degrees it got chilly fast. Luckily we travel with all of our winter gear. Had this incident happened on one of the many steep descents or curves with snow and ice, the outcome could have been disastrous. My wife has decided that if the vehicle does get fixed, she does not feel safe driving home in it. Reading online forums show that this is a very common occurrence and individuals are looking into a class action lawsuit against GM due to the safety issues associated with this. An individual passing by had a code reader and tried to reset the ECM but could not. I will include the report.

- Fairbanks, AK, USA

On [XXX], while driving on the [XXX] Highway with my family, the vehicle automatically shifted into neutral and I lost control of the accelerator pedal. I safely changed lanes and pulled over to the shoulder. Once in park, the vehicle never started again. We were stranded on the side of the road until my husband and a tow truck returned to collect my family and tow the vehicle to the Fairbanks dealership. The engine was diagnosed as an engine failure requiring complete engine replacement. We are a military family and were on orders to move our household on [XXX]. We did not have any other option but to trade in the vehicle and purchase a new one. Had I been driving on a road that did not have a shoulder or the traffic too congested to safely change lanes, my family could have been in significant danger for a motor vehicle accident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Blacksburg, VA, USA

January 16, 2025: Driving down the interstate near Atlanta Ga going 75 MPH, our 2023 Yukon Denali with 28,585 miles on it, abruptly started gearing down. The vehicle would not accelerate, it was coming to a stop on its on. Traffic was very heavy and it was a very scary situation. After managing to get the vehicle barely off the interstate it totally lost power and would not start. The vehicle was towed to the local GMC Dealership and within 30 minutes they told us the engine had locked up. We had to get a rental car to continue our trip and haven-??t had much luck, so far, getting reimbursed. As of today February 6th, GMC cannot give us an estimated repair date as our engine is on back order!

- Parsons, TN, USA

Engine failed on highway while my wife was driving with 3 kids aged 5 and under. Had to pull over on shoulder. Called GMC roadside and they said they would be there in 2 hours. Then a police officer came by, told her she was in too dangerous of a spot and that the police would be towing the vehicle in 20 minutes if she didn't move it. Police then towed the car while my wife, on the shoulder of a busy highway, had to frantically move the 3 kids and their car seats into a friends car. Got car towed to GMC and they did a full engine replacement. No warning lights, no signs of malfunction, and car had about 4k miles on it at the time.

- Lake Forest, IL, USA

The contact owns a 2023 GMC Yukon. The contact stated while driving at approximately 65 MPH, there was an abnormal clicking sound from the engine compartment. The contact stated that there were no warning lights illuminated. The contact arrived at the destination and checked under the engine compartment and saw engine oil covering the undercarriage of the vehicle. The contact had recently had an oil change performed by the dealer. The contact had taken the vehicle to a local dealer and was informed that the oil filter was not tightened correctly and refilled the reservoir and replaced the oil filter. The vehicle was repaired. The contact stated that after returning to his home state, the contact heard the clicking sound and checked the oil dipstick. The contact stated that the dipstick was not reading any oil in the engine. The contact checked under the vehicle, however this time there was no visible sign of an oil leak. The contact stated no warning light was illuminated. The contact had the vehicle towed to the dealer, where it was diagnosed and determined that oil needed to be added. The vehicle was repaired; however, the failure recurred. Additionally, the contact stated that the vehicle was shaking as if it was going to stall. The contact stated that there were no warning lights illuminated. The contact had the vehicle towed to the dealer. The vehicle was not diagnosed or repaired. The manufacturer was informed of the failure. The failure mileage was approximately 25,000.

- Palmetto, FL, USA

Driving at a slow rate of speed turning onto my road the engine started making a loud knocking noise, I could actually feel the knocking through the steering wheel and seat. Loss of power due to the problem. No warning before the issue started. Had to have vehicle towed to my local dealer. They are currently looking into the problem.

- Lexington, NC, USA

Engine Failure at 19K 14Months old 6.2L 2023 GMC Yukon Denali Ultimate "EVERYONE IS HAVING AN ISSUE THESE ENGINES COMING APART" LOW MILAGE

- Milton, MA, USA

Engine ticking at start up and acceleration, shuddering, rough idle, potential lifter issues. This has been going on since i bought the vehicle brand new, just now finding out about potential engine failure.

- Santa Maria, CA, USA

While driving, with no preliminary warning, the engine shut down and I lost power. System showed a "PRESS START" message on the dash. I coasted to a stop blocking traffic on a neighborhood street. After two weeks at dealership, I was notified it was engine failure, and I need a new engine. As of now, engines are on back order and there is no ETA.

- Andover, KS, USA

While driving at highway speed we experienced a bearing failure that let to an engine replacement. The engine was subsequently replaced for galling from the piston arm. No warnings or engine malfunction notices occurred prior to the incident. It is my understanding there is an investigation into this specific problem with the 6.2L GMC engine. We were fortunately able to exit the freeway and immediately stop the vehicle to avoid any further safety risks.

- Houston, TX, USA

Complete engine failure while driving. Resulting in GM replacing the entire engine after only 15K miles (new vehicle).

- Glenwood, MD, USA

The contact owns a 2023 GMC Yukon. The contact stated that while driving on the highway at 60 MPH, there was an abnormal sound coming from the engine. The contact stated that the check engine warning light was illuminated. The vehicle was taken to a local dealer to be diagnosed and the contact was informed that there were metal fragments inside the engine. The contact was informed that the engine needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The manufacturer was notified of the failure. The approximate failure mileage was 31,000.

- New Braunfels, TX, USA

The contact owns a 2023 GMC Yukon. The contact stated while driving approximately 70 MPH, the vehicle lost motive power. No warning light was illuminated. The vehicle was towed to a local dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired. The contact was informed that it might take approximately 6 months to repair the vehicle. The manufacturer was made aware of the failure. The failure mileage was approximately 38,118.

- Campobello, SC, USA

Bought the truck back in January of 2023. Within 3 weeks of owning it an only 900 miles it spun a thrust bearing. Told me 9 months for a new motor. Offered to rebuild it an try to fix. They tried an fail miserably. During the final road test after rebuild had massive lifter failure. Replace cam ran the truck for about 4-6 months an lost all tolerance on main bearings an thrust bearings again.

- Hooksett, NH, USA

The complete engine on this vehicle was replaced by GM on 04/05/2024 at 24,069 miles. This was due to the known engine failures GM is having with the 6.2L engine. This is a well known and documented safety issue that GM is refusing to properly address. Vehicles with the 6.2L L87 engine are having complete engine failures while driving at highway speeds, which is a huge safety issue. I live in north Georgia where the roads are steep with sharp blind curves. I frequently cross steep mountains with high elevations that require frequent brake usage and constant steering through the sharp curves. I also drive on the interstate in Atlanta, GA where the posted speed limit is 70MPH. An engine failure in any of my driving circumstances is life threatening. As you know, when the engine fails you're braking and steering capabilities are greatly reduced. For example, if I was to experience an engine failure while driving across the mountain I would be unable to stop or get the vehicle off the road. Without being able to move, I could be stranded in a blind curve where I could be struck by another vehicle. I do not feel safe driving this vehicle and I'm in constant fear that it will have another engine failure like so many other 6.2L owners are experiencing. I'm morally unable to sell this vehicle to someone else due to the known engine failures. GM will not take responsibility and fix the issue or buy it back. So, I'm stuck with a $90,000 SUV that is unsafe to drive. Please continue to investigate this safety issue! You are saving lives by doing so. Thank you for everything you have done and are continuing to do. Please let me know if you need additional information or I can be of assistance.

- Blairsville, GA, USA

L87 Engine suddenly, withoiut warning started having a severe engine rod knock. Safety put at risk because the engine could blowup and lock vehicle up. Dealer confirmed rod knock and will replace engine under warranty. ZERO prior indication (No SES or other warning lights).

- Laveen (Maricopa), AZ, USA

Brand new 2023 Yukon with 800 miles, 1 week into ownership, engine died while driving on 4 lane highway with no shoulder. Died, lost power steering and power brakes shortly after trying to maneuver to side of road. Vehicle was towed to dealer and they found a spun rod bearing resulting in catastrophic engine failure and had to have engine replaced.

- Buda, TX, USA