Possible cam shaft or lifter failure. The engines power greatly reduced speed and sputtered which significantly slowed the vehicle down and could have caused and accident. It has been inspected by a certified GMC service shop. There was a check engine light on and it was supposed to be all fuel injectors, that didn't solve the problem the shop kept on digging and digging and said that they don't know if it is the cam or lifter. It is my understanding that this is a very common issue amongst these vehicles and puts alot of people upside down and out of a vehicle due to this issues. The service shop said that a new engine would cost up to $20k and it could take 4 weeks to 4 months to get the new engine in. They are back ordered because so many people are going through this issue. The service shop also said that they didn't know exactly when the engine would come in.

- Hermosa, SD, USA

After stopping and then go, like at a light or stop sign, on acceleration SUV will go slightly forward and stalls and high rev for a second and car feels like it-??s dying or losing power and starts back up. I feel unsafe and that the car might stop middle of intersection from stop-and-go. Sometimes while driving I lose power driving and stepping on gas pedal has a few second lag time to pick back up. I-??ve never had this issue before or any of my vehicles and I bought it new and we are original owners.

- Visalia, CA, USA

I own a 2018 GMC Yukon Denali that keeps burning oil. I was told that the light had to be on or the issue had to be duplicated. I did an oil change and 2000 miles later the oil light came on. I was out of town so took picture of dipstick which was bone dry. The dealership GMC of Brandywine had my SUV. I am highly upset because in other states the started a lawsuit bit nothing in MD. If GM knows this is an issue then why aren't they doing something. My SUV has been down since October 16 and no ETA for the part. No loaner or rental help from GM as well.

- Clinton, MD, USA

2018 Yukon Denali with 37,000 miles has developed a leak in the radiator and needs replaced

- Clyde, NC, USA

May 31st 2022-While driving on the highway, I lost control of my power steering. Luckily my husband was with me to drive it back home. June 1st 2022-Took it to a service center and was told it needed a part to fix the problem. We ordered the part, which would not be delivered until may 6th 2022. June 4th 2022- Went to drive, made it a couple blocks down the road when the ABS, electronic stability control, & the engine light came on. So I turned around to take it back home, only now my power steering was completely out, my car would not shift out of first gear. After arriving home, I attempted to put it in park but was unable to. My motor shut off but would not allow me to place it in park or turn the electric power off. The only option I had was to disconnect the battery. I let it sit for a few hours, reconnected the battery, now my car will not start at all. I am now unable to take my car to the dealership due to power failure Note: June 2nd & 3rd, my vehicle was not driven I did contact my local dealer to check if there were any open recalls, was told

- Hutchinson, KS, USA

2014-2018 Chevy and GMC's have a problem with cycling of the thermostat that causes stress fractures on the radiator leading to coolant leaks. Attached are GM bulletins on the 2014 and 2015 models. As one can see they have provided special coverage on the 2014 models to 5 years or 100000 miles for this problem.(Bulletin 15829) This is not true of the 2015 through 2018 like mine. Although they use similar verbiage in the bulletin P11513A and P11513F. It should be noted that Bulletin P11513A and F also applies to 2015 Cadillac Escalade Models, 2015 Chevrolet Suburban, Tahoe, 2015 GMC Sierra Denali, Yukon Models, Yukon Denali Models Equipped with 4.3L, 5.3L or 6.2L Engine (RPOs LV1, LV3, L83 or L86). ***Basically this is a safety hazard because when traveling highway speeds it puts car into reduced power mode and you can only drive very slow on highway or be stranded on side which is just as dangerous ***

- Pueblo, CO, USA

Car is not performing as it should

- Odessa, FL, USA