2023 GMC Yukon XL power train problems

“My vehicle 2023 gmc yukon xl with 5.3 , I have about 145000 miles on my suv. This vehicle have known defect in valve body and transmission, its same as 2021-2022 models ( GM Special Coverage N242454441 ) gm has acknowledged and doing special coverage for those years , last night I was on highway speed and got harsh shifts and I recieved errors on my screen something saying limp mode , and check engine light , I had to immediately pull over and I scan the code ( I had obd scanner in car ) I got 2 coded p0700 and p0747 , both for transmission and upon checking this is known issue for valve body and transmission, gm dealer has refused a special coverage on my vehicle and said this isn't covered repair , all of the sudden going in limp mode on highway put me and others life in danger I could have been rear ended while moving to pull over.”

“The car suddenly started bucking while driving on I95 at about 75 miles per hour. We were able to coast off highway and when finally towed to a dealership we were told we needed a new engine. The vehicle at the time had about 57,300 miles. It was very scary to be on a dangerous highway with tractor trailers speeding past and have NO control over the vehicle.”

“As I was driving on the highway the engine stopped without warning. I was able to safely maneuver the vehicle to the shoulder, but it took me a minute to figure out what happened. There were no engine warning lights in advance of the failure. It was concerning because I was traveling home alone with my 2 dogs and it was very hot. The vehicle had a prior Safety Recall performed regarding this issue, but the engine failed anyway. GM did replace the engine under warranty, but I am hearing that replacement engines are also failing, and I am worried this engine will fail outside the current warranty.”

“Vehicle passed previous recall for engine defect related to complete engine failure, GM switched oil viscosity. Recall performed 10-16-25. Complete engine failure diagnosed at dealer 9-4-26, related to exact malfunction that sparked recall.”

“PICO scope test #FDYZ295894391 on engine for recall #N252494003 engine , passed test. Drain oil filled with 0-40 replaced oil cap. Date 09/19/2025, mileage in 20142/mileage out 20142. Vehicle runs rough. Not stable at times. Vibration noise coming from the motor at times.”

“2023 Yukon XL AT4 with 67k miles suddenly had lifters fail. GM service said cam scored & metal debris all the way through to the pan, requiring total engine replacement. Vehicle was very well maintained with premium fluids and parts.”