The contact owns a 2018 GMC Yukon XL. The contact stated while driving at an undisclosed speed, the vehicle stalled with no warning light illuminated. The vehicle was able to restart. The vehicle was taken to an independent mechanic where it was diagnosed with engine failure and the contact was informed that the engine needed to be replaced. The vehicle was not repaired. The vehicle was towed to the dealer where the same diagnostic result was provided to the contact. The contact was informed that the engine needed to be replaced. The vehicle was repaired; however, the failure recurred. The manufacturer was not made aware of the failure. The approximate failure mileage was 70,000.
2018 GMC Yukon XL engine complaints
Page 2 of 2: complaints 11 to 16 of 16, newest first, as owners wrote them.
2018 Yukon XL: Safety of family put at risk over faulty transmission. Vehicle used to transport children many times daily. Transmission began slipping with slight lagging. Vehicle assessed by independent service center and we as customers told this is a common issue with GMC vehicles of this year. Service center was able to reproduce and confirm the issue. Total to rebuild entire transmission was $7,377.33. Total transmission failure. Entire transmission had to be replaced at tremendous expense to our family. Transmission began slipping with slight lagging. Engine RPM's would increase with no additional power or speed.
I heard tapping coming from the engine while it was running. Once I took it to a shop it was determined that the lifters and the camshaft was damaged and needed to be replaced.
Engine Valve Lifter for cylinder 3 had failed and Camshaft lobes damaged. Error codes of P0300 and P0303. Vehicle had 67,049 miles when I brought it in to be repaired at Park GMC in Greenville, SC on 12/28/2022. GMC has the lifters (they replaced all 8) and the camshaft. Failure happened while on I40 in the Smokey mountains at night while driving back from Dollywood with my family. Engine produced a gassey sputtering sound and I lost some power but only noticeable under acceleration. Had another lifter failed due to the worn camshaft lobes, we could have easily been rear ended. A year prior to the failure (September 2021), I had taken the vehicle to a Wakefield Buick GMC and Parks Buick GMC to be inspected due to a shake at idle. Both dealerships said there were no codes and they didn't know what was wrong but they could feel the shake/vibration intermittently at idle. In November of 2022, I got the P0303 error code and took this vehicle to a private mechanic (since dealerships previously said nothing was wrong) who diagnosed an issue with the fuel injector for cylinder 3. I had mechanic replace all 8 injectors and he cleared the code. About 150 miles later (while on I40), the code came back. I took this vehicle back to the private mechanic and after several weeks with my vehicle, he refunded me the labor and said it was probably an issue with the lifter but he didn't have time to take apart the engine. I then took this vehicle to Parks GMC in Greenville, SC where they diagnosed a lifter and camshaft failure. Lifters and camshafts should not be failing in vehicles with under 100k miles.
The engine started making a ticking sound a few days after thanksgiving. I made an appointment with the dealership but they couldn’t take it in for 3 weeks. The day before my appointment I was driving on the highway and the lifter broke which caused the camshaft and a few other parts to break causing sudden lose of power and severe shaking. The parts for the repair were back ordered and it took about 5 weeks to get my vehicle back. About 7 weeks later I started the car in the driveway and it again had lose of power and severe shaking. The parts that were replaced in January failed and ruined the whole engine. There is a 6 month back order on this engine. It has been sitting at the dealership for almost 2 months already. Both incidents I believe had the potential to cause an accident if I were driving with cars close behind me.
The torque converter is too small for the vehicles transmission which then caused it to break and put metal into the transmission fluid. Which cause the transmission to break. My safety was at risk was because while on highway it shot high on RPMs and then made funny noise and wouldn’t go. The problem was confirmed at Aamco transmission where I have to get the transmission rebuilt. There was never a check engine light or check fluid or any codes Thrown before the problem.
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