general problems of the 2023 GMC Yukon - part 2

The vehicle drove fine had no warning/ check engine lights. My girlfriend came up to a busy intersection and when she proceeded to cross the intersection the vehicles motor locked up stopping the vehicle in the middle of the intersection with traffic coming from both north and south direction. We had poor visibility due to blowing snow so she had to bail from the vehicle and stand on the side of the road so she would not be harmed if the vehicle was t boned. Vehicle stopped so hard and fast it threw her into the steering wheel. Was unable to get the vehicle restarted and could not get it to shift into neutral so vehicle blocked 1 lane of traffic completely and half of another lane until tow truck arrived to remove from road.

While driving the vehicles went into limp mode with a transmission issue. Vehicle was towed to the dealership where I was informed the transmission body valve has failed. Vehicle has been out of service for 3 week so far, still not fixed.

On may 23, 2025, I purchased a 2023 GMC Yukon xl VIN: [xxx] from the GMC dealership. ? at the time of sale, I specifically asked about the active gm engine recall. They assured me the vehicle had been inspected and was unaffected. On October 30, 2025, the engine catastrophically failed on a highway while my family — including my two small children — were in the vehicle. This created a dangerous emergency situation as I had to avoid high-speed traffic. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

My 2023 GMC Yukon at4 with the 6. 2l v8 has experienced multiple serious engine-related failures. The original engine previously was making a whining / knocking noise, then seized and required complete engine replacement under a gm recall/campaign involving 6. 2l engine failures. The replacement engine later developed a lifter/valvetrain failure and required lifter replacement. The vehicle is now again exhibiting a pronounced rhythmic mechanical knocking/tapping noise, primarily during cold starts after sitting for an extended period. The noise occurs on most cold starts and has been documented in multiple videos. The vehicle is currently at a GMC dealership for inspection. I provided the dealer with several videos clearly demonstrating the noise. The dealer has stated that it has not yet been able to reproduce the condition and is attempting additional cold-start testing. The exact cause is currently unknown. No consistent warning lights or dashboard messages have appeared with the current knocking condition. My concern is that this vehicle has already experienced a catastrophic engine seizure, followed by internal valvetrain/lifter failure in the replacement engine, and is now again exhibiting abnormal mechanical engine noise. I am concerned this may indicate another developing internal engine failure that could potentially result in engine seizure or sudden loss of power while driving, including at highway speeds or in traffic. The vehicle and engine remain available for inspection, and multiple video recordings of the recurring cold-start knocking are available.

Vehicle has 56000 miles currently and at 47000 transmission had to be replaced due to defective valve body. At 56000 miles, motor was replaced due to broken lifter. The vehicle currently will not start.

Owner was driving at highway speeds and the vehicle experienced multiple sudden stops. After consulting with the GMC certified repair facility, the control valve body of the transmission was determined to be faulty and replaced. As a result of the sudden stop at highway speeds, the owner experienced a torn rotator cuff and could have been involved in a serious motor vehicle crash.

I am writing to formally file a complaint regarding a serious and ongoing issue with my vehicle that has placed my safety at risk and resulted in significant inconvenience and financial burden due to general motors’ failure to honor my warranty in a timely manner. While driving on the highway, my vehicle suddenly began losing power and displayed flashing warning messages indicating that it would not shift into gear or out of gear and that power could be lost. This created an extremely dangerous driving situation and posed a serious safety risk to me and other motorists. I brought the vehicle in for warranty service, but general motors was unable to honor the warranty repair in a timely manner. As a result, I was without my vehicle for several months while it sat undrivable on the dealership lot. Once the vehicle was finally repaired and returned to me, the exact same transmission-related incident occurred again. Once again, I was left without the vehicle for an additional period of days. This repeat failure has severely shaken my confidence in the reliability and safety of the vehicle. When I picked up the vehicle after the subsequent repair, I was informed by a general motors technician that the brakes and rotors were most likely pitted and damaged and would need repair or replacement because the vehicle had been sitting undrivable for such an extended period of time. I was explicitly told this damage was expected due to the prolonged inactivity caused by the unresolved warranty issue. It is critical to stress that the vehicle only sat undrivable for such a long period of time as a direct result of general motors’ inability to honor the warranty in a timely manner. Despite this, I am now being told that the brake and rotor damage is considered a “maintenance issue,” even though a general motors technician directly advised me that this damage would occur as a consequence of the vehicle sitting for months due to warranty delay.

Vehicle was brought to dealership fountain Buick GMC 8701 s orange blossom trail, orlando, FL 32809 (866) 465-4364 for recall on engine. Dealership told our company that they were unable to repair or diagnose the recall this month June 2025. Vehicle has had an intermittent check engine light from time to time. I was instructed that it was safe to still drive the vehicle.

The valve body failed on 6/4/25. This caused the car to have a sudden jerk and then suddenly decelerate while driving with my children in the vehicle. It could have caused an accident if another vehicle had been following behind. The vehicle has been at the local GMC dealership for repair for almost 8 weeks now, and is available for inspection by 3rd party upon request. The same part failure has been found in the 2019-2022 models. There was no warning to this happening to my vehicle, just a sudden jerk and deceleration. After it occurred the check engine light came on.

SUV appears to get stuck in gear or struggle shifting causing jerky behavior and erratic drivability. Stopped driving and had it towed to dealer. Dealer stated engine code p0747 shown. Dealer stated faulty transmission valve body but no eta on parts. Told to keep driving unless condition gets worse. Vehicle is less than 2 years old and 20,000 miles. Check engine light goes on and off relating to the same condition and sometimes having shift issues.

My wife and I were traveling to denver CO to pick up my son and grandson from the airport. The engine started to make a very exaggerated rattle. We found a dealership near our motel where we took the vehicle to and were told not to drive home that the engine needed to be replaced. We had to arrange our own transportation for both us and the vehicle 8 hrs back to our home in rapid city, sd where our local dealership replaced the engine. The vehicle had approximately 65,000 miles when this occurred. Fortunately we were in a populated area when this occurred as there is a lot of very sparsely populated area between our home and denver. This malfunction not only cost me a lot of money but also put my family at risk in unfamiliar areas.

Driving 58 mph then felt like I slammed on my brakes out of no where then sped up on its own to 42 mph then wouldn’t accelerate but rpm was at 5000. Shortly after my reduced power warning came on. Well the next 12 hours I went to reverse and had nothing! now dealership is saying unknown timeframe for it to be fixed.

My name is [xxx] , and I am writing to formally lodge a complaint regarding a serious safety defect in my 2023 GMC Yukon with a 3. 0 duramax diesel engine. The issue involves the transmission valve body, which has caused rear wheel lockup at highway speeds. I experienced this issue at 34,000 miles on my vehicle, and it has been in the shop for over 5 weeks with no estimated time on parts availability. Despite opening a case with gm support, as detailed in the attached email transcript, I have not received a resolution. Gm has refused to replace the complete transmission on the vehicle and only offered to replace the valve body. This is unacceptable as the defective valve body has already caused damage to the transmission. I also opened a bbb auto line case, which was closed immediately after I denied the offer from the gm support representative. This raises concerns about a potential conflict of interest, as the bbb auto line seemed aware of my interactions with gm support. I am seeking a complete transmission replacement with a valve body upgrade kit from nextgen transmission, which I believe would resolve the issue. However, gm has not accepted this offer. I request that the NHTSA investigate this matter promptly to ensure the safety of my vehicle and others that may be affected by this defect. If this issue is not resolved, I will have no choice but to pursue legal action. Thank you for your prompt attention to this matter. Sincerely, [xxx] [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Transmission jerking upon acceleration at all speeds. Reproduced and confirmed by the dealer to be a faulty transmission valve body. Part is on back order and vehicle has been returned to me as it is “driveable” as per dealership rep. No warning lamps.

On April 30, 2025, my 2023 GMC Yukon with 68,000 miles on it (8,000 miles outside of the warranty and that I had purchased on 4/27/2024) randomly downshifted as I was turning into a parking lot and gave me a computer notification stating "service transmission now, unable to shift soon. " I immediately put my car in park and called onstar for her to read me the computer code. She said it came up with two codes so we brought it to wyatt johnson GMC in clarksville tennessee. They plugged in their computer reader and that's when the service provider informed me that my car was un-drivable because it was unsafe. We left it there for them to do a diagnostic test on it to see exactly what is wrong with it. A few days later they contacted us and informed us that it was a malfunction in the transmission valve body. The dealership informed us that it would cost $2754. 25 to fix but the issue is the part is on back order and they don't know when it will be available. We have been in contact with the dealership and with general motors customer service almost weekly trying to find out, when the part will be available and where I am on "the list" and no one has an answer. With the personal research that I have done, I have seen that people have been waiting for over a year. I also know that there are current class-action lawsuits for gm's Yukons for years a little older than mine and currently multiple complaints for the newer Yukons for the same transmission valve body issues. The dealership does not give out loaners anymore after covid. I have asked, general motors. Customer service has informed me that it's up to the dealership if they will give me one general motors said they would look into a possible reimbursement program if I have to purchase a rental, but they will only cover a car that cost $44 a day and that is not including taxes and extra fees, but I can't afford to rent anything and I'm missing work.

Vehicle has 32,000 miles and the valve body has gone out and now parts for possibly months. My vehicle has been in the shop over these first 2 years over 2 months. Now this issue with the valve body it has been in over two weeks and they claim it will be months before they can get parts. This issue puts the vehicle in limp mode and most likely is damaging the clutrch packs as they go out. People all over the forums are having issues with these 10 speed transmissions. Something needs to be done to help out those affected.

The contact owns a 2023 GMC Yukon. The contact stated that the vehicle failed to reverse as needed. The contact stated that the transmission was stuck in neutral. The contact stated that while driving 35 mph, the transmission was slipping. There were no warning lights illuminated. The vehicle was towed to the local dealer where it was diagnosed and determined that the valve body needed to be replaced. The dealer informed the contact that parts were on backorder. The vehicle was not repaired. The manufacturer was contacted, and a claim was filed. The failure mileage was approximately 72,000.

I am formally requesting a complete refund for my vehicle. It has only 6,300 miles, and the remedy provided for the recall does not adequately address the issue. The recall explicitly indicates defects in the engine components (rods/cam shafts) that may lead to a loss of propulsion. Merely inspecting the vehicle and adding thicker oil does not resolve the underlying problem; it only postpones the inevitable expiration of my warranty. Currently, there are no warning lights illuminated, as the vehicle is not driven frequently. The recall raises significant concerns, and gm should be taking more substantial measures than simply applying thicker oil as a solution. This approach feels like a temporary fix rather than a genuine resolution. I have communicated with the dealership, and have been informed there is currently no solution available for this matter. They are awaiting further instructions on how to proceed. I request a more thorough investigation into this issue for an appropriate refund, and I also wish to have this matter documented for future reference.

Multiple issues. . . I bought the vehicle in oct. 2023 1. Brand new. . . . First day I brought the vehicle home there was a whining sound coming from the transmission. The reaction carrier assembly had to be replaced along with all other components. The transmission had to be completely removed from the vehicle and repaired. 2. In may of 2024 I had to have the lifters replaced on one side of the motor. 3. Right now it's in the shop with a blown motor. Yes there's only about 43,000 miles on it and the motor is blown and has to be fully replaced.

My engine failed while I was driving & I had no warning. It was very scary & dangerous. Luckily I was in an area where I could get off the road quickly. It started skipping then lost power. I basically coasted off the road & had to call for help. It was making a bad knocking noise. This happened 2 weeks ago on April 16. It has been sitting at glynn smith. GMC dealership since. I was told by the service manager that the engine failed & I will need a new engine. The engines are on back order now. I fear they will replace it with the same problem. I see the recall this week but will changing the oil viscosity really fix it?? doubtful. Someone is going to get killed or hurt from this problem. I do not want the same issue to happen with a new engine.

While driving on the mass pike with my fiancé and 4 kids our motor suddenly died. We were using cruise control going 75mph and the vehicle shifted into neutral itself and the car died. I managed to make it to a break down lane and we had to sit there for 2. 5 hours before a tow showed up to help. The dealership said the motor seized and we were under the 60k for warranty and it was covered. They got us a rental the next day and then on the 3rd day they called and said it was lack of oil changes that caused it and they asked if I had records of service history. We bought the vehicle used and only had the vehicle long enough to perform 1 oil change. We did our oil change on time and I'm trying to locate service records from the dealership we bought it from. However there were no signs of dark and contaminated oil when I did the oil change at my shop and also no sounds or warnings coming from the vehicle prior to the motor seizing up. I think they are trying to get out of paying for the motor when its clearly a known problem with these 6. 2l engines.

I was going about 53 mph and went to pass another vehicle. While in the oncoming traffic lane, the transmission went out. The engine revved up and the gas pedal did not work. The vehicle has been inspected and was found to have a faulty control module that possibly caused the failure within the transmission. The parts are all on "indefinite backorder" and I have a $50,000 loan on a $60,000 vehicle that is now a paper weight.

The contact owns a 2023 GMC Yukon. The contact stated that while driving 40 mph, the vehicle unintendedly decelerated and failed to exceed 10 mph. The message "reduced acceleration" was displayed. The vehicle was driven to the residence. The vehicle was then towed to the dealer, where it was diagnosed that an unknown transmission part needed to be replaced; however, the part was on backorder. Additionally, the contact received notification of NHTSA campaign number: 25v274000 (engine and engine cooling), which the contact related to the failure; however, the part to do the recall repair was not yet available. The dealer was contacted. The vehicle was not repaired and remained at the dealer for 11 months. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the failure, but no assistance was provided. The failure mileage was approximately 37,000. VIN tool confirms parts not available.

Looks like this is a ongoing issue with my vehicles engine. The truck has 40k miles on it and the entire engine blew.

On March 28, my 2023 Yukon denali stalled on a 4 lane road forcing me to make an emergency stop on the side of the road in a right hand turn lane. The vehicle required towing to a local GMC dealership. They could not restart the vehicle and upon evaluation found metal shavings in the oil. They have recommended an engine replacement. There was no warning, it just stalled and would not restart. My Yukon remains at the dealership and we are still waiting for an engine.

I was travelling on the interstate at 75 miles per hour and the vehicle started slowing down and completely shut down. The engine warning light then came on and I had to coast to the side of the road. I was on the side of the interstate for about 45 minutes and the vehicle had to be towed. The repair shop informed me it was a complete engine failure requiring a new motor and that gm has an extended backorder time due to this being a widespread problem for these model years with the 6. 2l gas engine. The vehicle is currently at the dealership and will be there for several months waiting on an engine.

Cam shaft the problem was corrected by a licensed mechanic.

I am writing to express serious safety concerns regarding our 2023 GMC Yukon xl denali, which has been in our possession for less than two years and has only 24,000 miles. On multiple occasions, while driving at high speeds on the freeway with our four young children, the vehicle unexpectedly lost power and shifted into neutral without warning. This occurred approximately four times on March 9, 2025, when we contacted onstar for assistance. Despite their response indicating no alerts on their end, we were advised to reach out again if the issue persisted. Unfortunately, the problem did occur again on March 16th, which prompted us to contact onstar and have the vehicle towed to the nearest dealership for further evaluation. The service department has since informed us that the motor requires replacement. Upon conducting additional research, it seems this may be a known issue with many vehicles manufactured by gm around the same time. We are deeply concerned by this safety hazard, especially given that the malfunction could have led to a life-threatening accident. While we are grateful that we were fortunate enough to avoid any serious consequences, we believe a solution beyond standard repairs is necessary to restore our confidence in the safety of this vehicle. Our family’s well-being and trust in the reliability of our vehicle are of the utmost importance.

The engine lost power then suddenly stopped running while driving on an interstate.

The contact owns a 2023 GMC Yukon. The contact stated that while driving 70 mph, the vehicle independently shifted into neutral and stalled in the middle of the highway. An unknown message was displayed. In addition, after restarting the vehicle, the accelerator pedal was depressed but the vehicle failed to accelerate as intended. The contact stated that the transmission then shifted into neutral(n) independently after driving for several miles. The contact stated that the vehicle would not crank and was towed to a local dealer. The contact stated that the vehicle failed to shift into neutral and was towed while in park(p). The vehicle was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired and remained at the local dealer for further investigation. The contact related the failure to gm investigation: pe25001. The manufacturer was made aware of the failure. The failure mileage was approximately 20,549.

Driving at a slow rate of speed turning onto my road the engine started making a loud knocking noise, I could actually feel the knocking through the steering wheel and seat. Loss of power due to the problem. No warning before the issue started. Had to have vehicle towed to my local dealer. They are currently looking into the problem.

While driving, vehicle threw an error “ reduced acceleration, drive with care”. I had my children in the car when the car abruptly reduced speed and car jerked. It was very scary while driving. It was stuck in 5th gear. I was taken to dealership. Code showed it needs a transmission valve body replacement. Part # 24065353. Dealership has stated part is “on backorder with no eta of the part”. My car has been sitting on the lot for 17 days waiting to be fixed.

The engine started making a rattling sound while on an interstate. The vehicle was able to make it to the next exit before it immediately lost power leaving it on the shoulder of a narrow road just past the exit ramp of the interstate. The vehicle was towed to a local gm dealership where technicians confirmed the engine was no good. This is the second engine that this vehicle has had replaced one at 18000 miles and one at 20000 miles. The engine failed with no clear warning signs, no check engine light, and no obvious causes like low oil.

Gm has failed to resolve repeated issues on my vehicle (VIN: [xxx] ). I was never notified of any official buyback denial. Gm customer assistance continues to avoid clarifying the status and refuses to provide documentation of the denial. This creates an unresolved safety and reliability concern. I need an investigation into the consistent mechanical defects paired with gm’s refusal to properly process my claim. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

My engine stopped while I was driving. Unable to accelerate and the car will not start and is dead. Transmission light and def service lights came on. Luckily I was able to pull over to safety, barely. It was towed to the GMC dealership and waiting for it to be looked at. There were no warning lights that came on previous to when this happened. This is a huge safety concern for gm and it needs to be a recall because many, many others have reported the same complaints.