2018 GMC Yukon

Dealership did a tune-up in June 2025 and had my truck for 2 weeks, no issues with transmission discovered or discussed. Now in September 2025, 2018 GMC Yukon has developed a torque converter shutter when driving between 40 and 50 mph. I took the vehicle to an independent shop who told me they had some computer tool to manually control the transmission, and there is an internal failure. There was a transmission flush completed hoping to gain results, however it was very short lived.

I was driving on I75 North, just North of Chattanooga. I was in the Center Lane. I lost all power to the vehicle. The engine stopped. I had no power steering, no power brakes, and was in heavy traffic. I managed to shift lanes and get it to the shoulder of the road. The vehicle was towed in. Diaganostics were completed by a certified mechanic. The engine had seized. GM has several recalls on this issue. 2018 is not included. However, this is the exact same issue that is happening with 2019 and up. That were recalled. I urge you to order an extended recall to include 2018 vehicles as well before someone gets killed.

My 2018 GMC Yukon blew an engine with only 81,000 miles. Had four shops including (2 GM dealerships) look at the vehicle, pictures, and findings and concluded the engine had blown. The vehicle had began running very rough while driving down the road at 45mph. The CEL showed a misfire in cylinder one. The spark plug was pulled and soaked in oil. A borescope was put down the hole and found oil pooled on top of the piston. The engine has blow by the piston rings and the cylinder wall was scorn. Four shops. Four results. New engine needed. A quick google search of the engine (L83) showed multiple open class action lawsuits for this exact situation. The cause of the problem is the active fuel management system that GM created. When I contacted GM for assistance at the recommendation of the dealerships (which they have seen an increase in these engine blowing with low miles) I was informed by GM/GMC that they would look into it and could not guarantee assistance. Fast forward a couple of days I was contacted and made perfectly aware that I was 991 days outside and 21,000 miles out of warranty but they would offer “assistance” in the amount of 10% of the total cost. Four shops, four quotes for an engine replacement ranging from $14,750-$17,000 and GM was only offering $1,475-$1,700. Absolutely terrible. With multiple open class action lawsuits, stop sales, and well documented issues. I expressed disappointment and requested assistance to prevent having to seek litigation. I was told “if that’s what you want to do, you will need to talk to our legal department” and told there’s nothing they can do. Will not buy nor recommend anyone buy a GM product. They don’t respect or care for their customers.

driving the vehicle on a regular city street when the flashing engine light came on out of nowhere. immediately pulled off and had the vehicle towed to my dealership. result of the inspection, i have to replace my engine. as soon as i started researching the issue it is clear that this truck should be part of the GM recall. it is a known issue that GM slow played for years, but as of now this vehicle is not part of the recall. it is the same engine and failure mode as the 600,000 unit recall, but mine isn't covered by the recall leaving me responsible for their known and documented manufacturing issues

Vehicle (engine) shut off while driving on highway. Would not restart. Had vehicle towed from highway to repair shop. No check engine light ever came on. The engine was replaced and old one had to be returned in order to avoid paying a $5,000 core charge. I found out after replacing the engine that GM issued a recall but I read it starts with 2019 models and only reimbursement for original owners. I purchased this vehicle from a GM dealership in CT (Scranton of Vernon) in 2022 with approx 52,000 miles.

My 2018 GMC Yukon SLE has a Transmission Failure and a engine oil coolant failure. The issues occurred while driving when the vehicle had to go into limp status to prevent the transmission from complete failure. I have taken the vehicle to the dealership 2x and they changed the fluid once and replaced the thermostat the second time. Neither case fixed the vehicle, it is currently in the shop for transmission and radiator w/ engine oil cooler replacement - $8200 The vehicle has been inspected by Aamco of Dover, DE and is awaiting inspection by warranty company 3rd party inspector. There are no warnings before the system is overheated and goes into limp status and at that point an alarm sounds in the car.

The contact owns a 2018 GMC Yukon. The contact stated that the message "Transmission Hot - Idle Engine" was intermittently displayed. The vehicle was taken to the dealer, where the TCM was reprogrammed, and the thermostat and the water pump were replaced; however, the failure persisted. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 101,000.