2023 GMC Yukon power train problems

“Initially the vehicle was slowing at a moderate pace from 75-40mph while on the freeway during [XXX] rush hour. Two days later after getting off the interstate, the rear wheels locked up while doing 40mph on a side street for approx. 1.5seconds. If this had happened on the freeway it would have caused an accident or loss of control. The dealer inspected the vehicle, recreated the issue, and stated the valve body valves were sticking and needed replacement. We never got any warning lights, nor did the dealer before and after they recreated the issue.”

“Vehicle was impacted by the engine recall. After the recall repair attempt, the problem resurfaced and persists. The deal ship has the vehicle and has been down for nearly 7 weeks. I feel unsafe driving the vehicle and asked GM to write me a letter stating the vehicle is safe to drive with this recall. They refused. If this isn’t a problem, why not provide that information. They know they have a problem and won’t help.”

“Engine began to reduce RPMs while driving up an incline and was unable to maintain speed. Warnings came on for battery, oil, transmission failure, engine failure. Power ultimately failed and electric finally shutoff after short period of time. Was able to connect to Onstar and they got a tow truck there in 2 hours. I had to hitchhike 30 miles to our residence to get another vehicle to pickup my wife and our 2 large dogs because tow truck unable to transport them. There is no Uber or Lyft in the rural mountain areas of [XXX], and no cell service. Car was towed into service center about 50 miles away, and I was told that the engine had to be replace. But they don't have the parts available after a week.”

“My 2023 GMC Yukon AT4 is "hard shifting/jerking" during acceleration. This occurs approximately 5 times per week and I am starting to get safety concerns. I have had the transmission flushed (09/14/2026) and then had the diagnostic measured 09/23/2026, with the Repair Order stating "no problem found at this time." During travel on 09/28/26, the violent shift scared my wife and children, so I returned my vehicle to the dealership on 09/29/26. A mechanic traveled with my and the vehicle shifted, but the mechanic told the service representative that the vehicle shifted when we hit a bump in the road. I have been to the dealership three different times to address the concern, but the repair orders state the dealership could not find any problems. I was advised to return the vehicle to the dealership when the "shifting" occurs more frequently. At this time, my vehicle milage is 57340 and I am afraid that my 60000-powertrain warranty is going to expire and I will be forced to pay for a defective vehicle transmission.”

“On May 8th of 2026 my 2023 GMC Yukon with approximately 42,900 miles experienced an complete failure of the 6.2L engine requiring replacement. The engine failure occurred despite the engine having recently undergone inspection and special oil being used related to NHTSA 25V274 / GM N252494000 recall. When the engine failed, the vehicle could not be towed or pushed out of the flow of traffic because the computer will not allow the vehicle to be shifted into neutral, only showing "Conditions not correct for shift" in the instrument cluster. This sudden and unexpected loss of engine power combined with the inability to remove the vehicle from the lane of traffic creates a dangerous situation.”

“L87 recall was completed on 10/22/2025. On August 8th 2026 the engine developed a loud knock. It was taken to the dealership on 8/31/2026 after inspection it was determined that the engine had failed and needed to be replaced. There was no warning lamps that indicated there was an issue with the engine. The vehicle was still driveable when it was taken to the dealership. If the engine had completely failed while on the highway it could have caused a major incident.”