Power Train Problems of GMC Yukon - part 2

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.

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A valve in the transmission is sticking causing a loss of power, engine light warnings to flash, and hard gear shifts from park to drive or reverse. First occurred on 5/25/25, went to the dealer service department on 5/26/25. Part still not available and it’s been sitting at the dealership since.

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In may 2025, my vehicle suddenly started jerking, shaking, and almost stalled out while driving. I was on a busy 3 lane roadway with 6 passengers total. As I would try to accelerate, the power was significantly decreased. I felt it jerk between shifting several times. My check engine light came on. I was so scared that someone would hit my vehicle and injure us. I brought it to a GMC dealership. They said that my transmission failed, metal in the transmission fluid. How is this possible? upon researching this problem, this is a common issue with the 2017 GMC Yukon denali. There are class action law suits and lemon law lawsuits against GMC regarding this problem which causes major safety concerns. My vehicle has been well maintained with lots of service records to prove it. I have babied her and I’ve never towed anything. This transmission issue needs to be addressed and recalled. I need a new transmission which will cost between $5,000-$7,000. This is just horrible and disappointing regarding the quality and reported issues that are not being recalled by GMC.

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The contact owns a 2021 GMC Yukon. The contact stated that while accelerating, the vehicle jumped and hesitated while accelerating until the vehicle exceeded 20 - 25 mph. The contact stated that at 1,500-2500 rpm, the failure recurred. There were no warning lights illuminated. The contact stated that while looking online, the contact discovered information about NHTSA campaign number: 25v274000 (engine and engine cooling) with a similar failure. The dealer was contacted, and it was confirmed that the VIN was not included in NHTSA campaign number: 25v274000 (engine and engine cooling). An appointment was scheduled for the vehicle to be diagnosed. The vehicle was not repaired. The manufacturer was informed of the failure, and it was confirmed that the VIN was not included in NHTSA campaign number: 25v274000 (engine and engine cooling); because the manufacturing date was 3 months after the date for the vehicles listed under the recall. The manufacturer referred the contact to the NHTSA hotline to report the failure. The failure mileage was 75,000.

We are back on shop for lifter replacement for the 3rd timeand possibly more once they open the project. Valve springs replaced and lifters.

Driving down the expressway at 65mph, and the vehicle completely stops, almost causing a collision. After researching the problem at the GMC dealer, it appears that the entire engine has internally failed. Apparently it was a complete engine failure.

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The contact owns a 2016 GMC Yukon. The contact stated while driving 70 mph, and attempting to accelerate, the vehicle jerked, then briefly lost motive power before the engine seized. The contact was able to coast to the side of the road. The transmission warning light was illuminated. The vehicle failed to restart. The vehicle was towed to a friend's residence. The vehicle was not diagnosed or repaired for the most recent failure. Days before the failure, the vehicle jerked while driving at various speeds. The vehicle was taken to auto zone; however, no cause for the failure was found. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 143,000.

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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).

Driving at 55mph and suddenly the car starts to shack and warning/notification lights copme up on the dash. Check engine traction control service light suspension service was able to drive it to GMC dealership nearby 2. 6mile.

Transmission issue - 2021 Yukon xl broke down 5/6/25 while driving with 2 of our children in the vehicle. The rpms skyrocketed but the vehicle wouldn't go. Was hard shifting and speed would not exceed 35ish mph. Message popped up on vehicle that said acceleration throttled and engine light came on. Took it to dealership and it is a known problem. Transmission needs a valve body replacement. This part is on national backorder for months. Spoke with the dealership on 6/5/25 and they still do not have an eta. They ordered one on 3/19/25 that still has not arrived. I received a case number from gm but they are extremely unhelpful.

Dropped my 2022 Yukon denali off may 7, 2025 to mike reed chevy due to failed transmission. Order was placed may 15, 2025 for a valve body part. Multiple phone calls were made without success on status of repair. I was forced to drive to the dealership for answers on June 10. I was told that due to my car being under warranty I am at the mercy of gm. The part needed is apparently on indefinite backorder. Contacted gm to expedite part and was told it could be 3+ months before I can expect my car back. Claim number with gm is 55328239. After doing research, there is over 2000 people who are experiencing the same issue. Mike reed chevy nor gm offered assistance with a rental to offset the inconvenience. It was only until I demanded to speak with the service manager that I was given a rental car. As someone who manages a hospital, the delay in obtaining this part has caused significant hardship, and to date, there has been no clear timeframe provided for when the part will become available or when repairs can be completed. As a consumer, I am left without reliable transportation as the dealership has requested me to return my rental. The lack of transparency or timeline for resolution is deeply concerning. This has not only impacted my ability to fulfill daily responsibilities, but has also raised broader concerns about the availability of necessary vehicle parts and the protections in place for consumers in similar situations. I am seeing guidance or intervention from your office to help expedite this matter, whether through direct communication with the manufacturer, identifying legal remedies available under consumer protection laws, or advocating on behalf of consumers facing unreasonable delays in vehicle repairs due to supply chain issues. Any assistance or direction your office can provide would be greatly appreciated.

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Valve body failure 72000 miles and warranty ended at 60000.

My 2017 GMC Yukon slt,, has been having shifting problems, including hard or delayed shifts, clunking, jerking, and even sudden jolts when downshifting. Rough or jerky shifts, particularly during acceleration and deceleration, a delay in engaging gears, especially when shifting from park to drive or reverse. Transmission shifts are very rough in slow traffic with as much as one to two-second delays in shifting into gear with a loud thump. It is so rough that it feels like someone may have ran into your back bumper. It is also bad enough that it startles the driver, and it could be a safety issue.

Purchased a GMC denali Yukon ultimate xl June last year . 103 thousand. Bought it in for first oil change at 5500 miles the car has been leaking oil ,too, now its been back three times and still leaki9ng oil. Last week brought it back told service advisor itys leaking at the oil pan by the plu it drips everynight on the floor of my garage and I am put oil in it every two weeks. Anyway they said they didd the dye twicw and didnt find the leak, I said let me show thhe mechanic the spot it leaks . I went in shop under vehicle showed the mechanioc he looks and says ok now I see it its need a rear main seal and oil pan gasket. So now I am bringing it in on the 134th of this month for a repair. The vehicle was made June 20-04 and tullety GMC says my 6. 2 is not involved in recall the lady checked her computer. . I would have never bought this vehicle knowing GMC knew they had an iossue with the ngine. My resale value will be hurt big time by all; the negative publicity. I hear they want to put zero 40 thicker oil to patcvh a sick engine ,,thats a band aid on a engine wiith lo0ose clearances. And why is the 2025 6. 2 going top keep using zero twenty and not zero 40 oil. I [xxx]I think , this engine in this GMC is noisy in the motrning also when cold . I think I am gettingb a [xxx] story . I only have 13200 miles and the car is still leaking after 3 visits . Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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Loud noises started under the car and eventually shut off in middle of the interstate, thank fully another person help us move the car to the shoulder and nothing happened.

I am writing to formally report a serious issue with my 2021 GMC Yukon xl. The vehicle has developed multiple severe problems, including: •significant loss of engine power •noticeable engine knocking noises •transmission slipping while driving •transmission movement even when the vehicle is at a full stop these issues not only impair the performance of the vehicle but also raise serious safety concerns. The loss of power and the slipping transmission could lead to a dangerous situation while driving, placing both myself and other motorists at risk.

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.

I have had major transmission failure in my 2021 GMC Yukon denali (6. 2l v8, 10-speed automatic). The vehicle has approximately 72,000 miles. Recently, a critical internal clip/retainer in the transmission broke loose, sending metal debris throughout the transmission. This catastrophic failure has rendered the vehicle undrivable and requires a complete transmission replacement. Unfortunately, the vehicle is just outside the powertrain warranty, yet I firmly believe this failure is due to a manufacturing/design defect – not normal wear and tear. I purchased this Yukon denali as a premium, flagship SUV and have maintained it carefully. I expected the transmission to last well beyond 72k miles under normal use. It is disappointing and that a core component failed so early. Not only has this imposed a significant financial burden, but it also undermines my confidence in the vehicle’s safety and reliability for my family. A modern transmission should not self-destruct at this mileage, especially given gm’s reputation and the denali’s top-of-the-line status. Importantly, I have discovered multiple known issues and gm bulletins related to the 10-speed automatic transmission used in my Yukon. For example, gm issued a major recall in late 2024 (NHTSA campaign 24v797000, gm recall #n242454440) affecting 2021 Yukon models (among others) due to a defective transmission control valve that could fail and cause the rear wheels to lock up, this demonstrates that gm has acknowledged serious problems in the 10l80/mqc 10-speed transmission design. Additionally, a recent gm service bulletin (pip6008c, Jan 24 2025) indicates that internal transmission retaining rings can dislodge, causing the internal gears to separate – which leads to loss of reverse and internal damage. This scenario is similar to what happened in my transmission. My family was left stranded away from home with no warning. The vehicle just stopped working. The warning lamp did not come on until diagnostics was run.

On [xxx] my spouse was 20 miles west of jamestown, nd on [xxx]. Our 2022 GMC suddenly lost power at interstate speed, shifted into neutral. My spouse was able to coast the vehicle to avoid traffic and drift to the shoulder of the road leaving her stranded on the shoulder of the interstate. Vehicle has been towed to nearest gm dealer and diagnosed the problem related to recent recall. Gm has been less than helpful in this scenario. This has created an extremely frustrating issue as I am informed gm knew about this issue prior to issuing a recall which in turn resulted in unnecessary risk to myself and family. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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.

The contact owns a 2016 GMC Yukon. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly downshifted with the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 250,000.

Total valve body failure in the transmission at 30k miles. I was traveling with my daughter on the freeway at 65 mph and the vehicle went into limp mode. No indication of problems prior to this incident. Vehicle has been at dealer going on a month now. They have no valve bodies available, on a national backorder. They replace it with the valve body that is known to fail again. Gm knows about this problem and the solution they offered was only a software upgrade so the back tires don't lock up when this happens. My daughter and I could have been seriously hurt or killed.

My lifters collapsed and camshaft got damaged and my cylinder in the bottom of my engine failed also. I know there is a recall for engine failure on the exact year make and model as my vehicle, the only difference is the liter engine. Mine and my 3 children’s safety were all put at risk when we were left stranded on the side of the road 6 hours from home the problem was inspected by GMC themselves and the tech admitted to this being a big problem with motors like mine yet they are offering zero help to make it right with me because my liter engine isn’t on the recall list even though many are acknowledging its happening with the 5. 3 liter engines as well. My engine has failed as part of Gmcs negligence. There were absolutely zero warning signs prior to this happening.

I brought a 2017 Yukon GMC from a dealership. When I first drove it on a highway it began to pull and shake, to the point it slow down on the highway. Also the dashboard started to shake , vibrate on the highway. When I step on the gas on a local road ,the transmission is pulling to pick up speed. Took it to a mechanic and explained to him what was going on he test drove it and told me it's the transmission. He also said this year truck " GMC" truck like this has bad transmission. I did my research and find out that it is true. I have a disabled mother that I take to her doctors appointment and I'm scared bto out her in this truck. This is a 1 vehicle and anytime the truck will just slow down or vibrate or shake. No check engine light comes on when it happens. Ifni driving on a highway sometimes the check engine light will blink 3 to four times then go back out.

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.

The contact owns a 2021 GMC Yukon xl. The contact stated while driving approximately 3-5 mph, the vehicle unintendedly shifted to neutral, and the vehicle stalled immediately. The contact stated that the vehicle failed to restart. The vehicle was towed to the dealer and was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired because the engine was on backorder. The manufacturer was informed of the failure and confirmed that the VIN was not under recall. The manufacturer opened a case for the failure. The failure mileage was approximately 80,000. The VIN was unavailable.

I am writing to express my concern regarding a serious issue with my 2021 GMC Yukon. Recently, while driving, I experienced a sudden surge in power. About five minutes later, when attempting to shift into reverse, the vehicle would not respond. I tried multiple times with no success. Afterward, while driving it briefly around the block, it made a clunking sound, which raised further concern. Ultimately, I had to call a tow truck, and the vehicle was taken to george gee GMC in liberty lake, washington. Unfortunately, the next day the dealership was unable to duplicate the issue. There were no warning messages on the screen at the time of the incident, and no diagnostic codes were found, so they could not move forward with any repair. I later discovered that this exact issue is addressed in technical service bulletin n242454441-02. However, I was informed that my VIN is not included in the special coverage, despite my vehicle being the same year and equipped with the same transmission mentioned in the bulletin. I am deeply concerned that this problem could happen again—possibly while I am driving in canada, transporting my children, or in a location where calling a tow truck would be very difficult. My safety and my family’s safety are at risk, and frankly, I am now anxious about driving a vehicle I used to trust. I also have an extended warranty, but when I contacted gm service, I was told that unless the problem can be duplicated, it would not be covered. This is extremely frustrating given the severity of the issue and the fact that it is already documented in an official bulletin. I am requesting that this situation be escalated. I would appreciate any additional support, coverage, or guidance gm can offer to help ensure this issue is resolved and does not put me or my family at risk again.

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.

Driving on the highway the engine suddenly revved high and suddenly went into limp mode on the highway. Reverse is no longer operational. 2022 GMC Yukon with 49,000 miles. Limped the vehicle to the dealership who has indicated it needs a new transmission valve body that is currently on national backorder given the prevalence of the issue. I have been requesting a work order denoting the failure and required repair but have not yet received from my dealership. I will pass this along as soon as I receive it. I spoke with gm customer service last night requesting their assistance in getting this for me.

Nhtsa complaint: campaign 25v274 vehicle: 2024 GMC Yukon (VIN: [xxx] , 33,294 miles) gm case #[xxx] recall: n252494000 (NHTSA 25v274), issued April 24, 2025; related bulletins n252494001 (dealer inventory), n252494002 (engine replacement) defect: manufacturing defects in the 6. 2l v8 (l87) engine’s connecting rod and/or crankshaft, risking engine failure and crashes. Issue: my vehicle has been at royal Buick GMC, inc. (355 rte 23 n, sussex, NJ 07461) since April 10, 2025 (104 days as of July 23, 2025). The recall remedy (inspection for dtc p0016, oil change to 0w-40 if passed, or engine replacement per n252494002 if failed) is unavailable, with no repairs performed per invoice ro# [xxx} (July 22, 2025). The dealership provided a lesser-value loaner, inadequate for a premium SUV. On July 23, 2025, at 5:03 pm edt, the dealership texted, “your vehicle is in the shop and should be done first thing tomorrow. I have it schedule for a wash tomorrow. I will follow up mid-afternoon on its status. Ty!” maggie stated they were waiting for the “new car shine to dry. ” when asked if the engine was replaced, maggie said it was “above her paygrade” and confirmed no solution exists, with no timeline for remedy availability. I instructed her I will not accept an unsafe vehicle and to relay this to the service manager. Nhtsa. Gov [xxx] ) confirms the recall is unrepaired, remedy not available. Communications with July 15, 2025, 3:00 pm edt: gm customer support supervisor rochelle confirmed no parts or resolution timeline. July 15, 2025, 3:30 pm edt: sms to tom mcgillis, service advisor, requesting update. No actionable gm response. July 23, 2025, 1:32 pm edt: gm representative cynthia stated gm had not heard from the dealership and escalated case [xxx] to internal corporate resolution. No parts or timeline provided. Complaint: gm’s 104-day delay in providing a recall remedy (n252494000/n252494002), inadequate loaner, information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Power steering going in and out while driving.

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