Other Fuel System Problems of GMC Yukon - part 1

My 2021 GMC Yukon has approximately 36,900 miles. On September 12, 2026, the vehicle was at an authorized GMC dealership and passed a state safety inspection. On September 19, 2026, the check-engine warning light illuminated and I returned to the dealership. The dealer performed diagnostic testing and told me the fuel pump pressure was approximately 400 psi when it should be approximately 700 psi. I was told the fuel pump needs to be replaced. The vehicle is currently at the dealership awaiting the replacement part: fuel pump I was not aware of a fuel-pump failure before the warning light appeared. I am particularly concerned because this failure occurred at only approximately 36,900 miles. Gm previously recalled 3,386 2021 GMC Yukons under NHTSA campaign 21v-739/gm recall n212332040 for a fuel-pump power-control-module defect that can cause the fuel pump to fail or operate intermittently, interrupt fuel flow and potentially cause the engine to stall. My 2021 Yukon is not included in that recall and currently shows no unrepaired recalls associated with my VIN. I believe this represents a potential safety concern because inadequate fuel delivery or a fuel-system failure while driving could cause reduced engine power or an unexpected stall, increasing the risk of a crash. Given the low mileage, the dealer-confirmed fuel-pressure problem, and the existing fuel-pump-related safety recall affecting other 2021 Yukons, I am concerned that my vehicle may have the same or a related defect despite not being included in the recalled population. I believe NHTSA should evaluate whether additional 2021 Yukons should be included in a safety investigation or recall. I am paying out of pocket to have the fuel pump replaced and am filing this complaint to document the failure. A fuel-pump failure at only 36,900 miles is extremely concerning. I ask NHTSA to determine whether my vehicle has the same or a related defect and whether the existing recall population should be expanded.

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Part number 13554821 fuel pump control module has failed 2 times. April 2023 on interstate 95 near savannah GA in very busy traffic. Vehicle buckled and seized, just barely made it to the shoulder of the road. Same part failed again 9/18/26 while turning onto sunrise hwy in NY another very dangerous situation as we were stranded in the middle of a very busy intersection.

On September 17, 2026, at approximately 22,861 miles, the 6. 2l l87 v8 engine in my 2024 GMC Yukon xl suffered a sudden loss of propulsion and was subsequently confirmed by an authorized GMC dealer to be seized and require complete replacement. I was entering northbound I-75 from the mt. Paran road entrance in atlanta, GA with two of my children in the vehicle. This entrance has an extended acceleration ramp where vehicles accelerate to interstate merging speed. While accelerating, the engine briefly stuttered and then the vehicle stopped producing power when I pressed the accelerator. I was unable to continue accelerating and moved onto the limited shoulder. Other vehicles continued accelerating toward I-75 and passed immediately adjacent to us at significant speed. My children and I remained stranded there for approximately two hours waiting for a tow. The vehicle was towed to an authorized GMC dealer, which confirmed the engine is seized and requires complete replacement. The vehicle and failed engine are currently at the dealer and available for inspection. This vehicle was previously subject to NHTSA recall 25v-274 / gm n252494000 for l87 engine failure and loss of propulsion. An authorized GMC dealer completed the recall procedure on November 3, 2025. The engine was not replaced; it passed the prescribed inspection and received the higher-viscosity-oil remedy. Despite completion of the recall procedure, the engine subsequently experienced the loss-of-propulsion condition identified by the recall. I understand NHTSA has investigated l87 engine failures occurring after completion of this recall remedy, including rq26001 and ea26005. I am reporting this post-remedy failure because it may be relevant to that investigation.

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6. 2l engine has the oil change update, and engine failed recently. Took vehicle for repair to golling GMC dealer. Waiting on feedback.

According to the gm dealership the rod bearing failed disabling the engine. Dealer recommends replacing the entire engine. This consistent with recall n 252494000-n252494003 but my VIN is not included in the recall. Estimated repair $11,200. Our family was traveling roughly 55 mph on the interstate at the time of incident.

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.

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My vehicle was with ancira GMC boerne for approximately three weeks where they replaced the transmission control system/module, the centralized onstar module, and diagnosed both rear screens for replacement. Approximately one month after getting it back, at only 49,800 miles, I experienced a complete loss of propulsion. The vehicle shut down while I was driving. Given the recent transmission repair and the fact that this failure occurred while the vehicle was in motion, I no longer have confidence in the safety or reliability of this vehicle. I have young children riding in this vehicle daily and I’m not comfortable accepting another repair and simply being told it’s safe to drive.

I think it is a transmission type of failure. I'm not sure of the exact mechanical specifics. While putting the vehicle in reverse, driving and or accelerating it feels like the transmission is locking up and then releasing, and then locking up again. It felt very dangerous for that to happen while driving down the road. I took the vehicle to a local mechanic that was near by for assistance and he said I should take it to a dealership because there was a recall due to that issue on my type of vehicle that he knew about. So I call a dealership to make an appointment, tell them I think the issue is due to a safety recall due to the transmission locking up. They check my VIN# and say there are no recalls for my vehicle, even though it falls in the same year, make, and model of affected gm vehicles , therefore they could not make a recall appointment for me. Even though I was experiencing the same type of issues on the same type of vehicle thats included in the recall. I did not have any warning lights before, or while driving. The day it happened, I drove the vehicle to work, parked, was at my office all day. Came out to go home and put the SUV in reverse and it like lunged forward, almost hitting the car parked in front of me. I thought I must have had it in the wrong gear or something. So I put it in park and then tried again. Then it felt like it locked up, rocked forward, and then allowed me to back up. I put it in drive and again it was like it was locking up and releasing very forcefully but then smoothed out and drove normal for a few miles and then locked up again. There were never any warning lights or messages during this time. I called gm to inquire why my vehicle isnt in the safety recall and all they could tell me was that they did not know. I was very afraid I was going to be involved in an accident due to this issue.

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On August 22, 2026, I was driving my 2023 GMC Yukon denali with the 6. 2l v8 at highway speed when the vehicle began struggling to maintain power while climbing a hill. The engine then developed a noticeable knocking sound. Shortly afterward, the engine shut off completely while the vehicle was moving, causing a sudden loss of propulsion. I was able to bring the vehicle to a stop, but the engine would not restart. The electronic transmission also would not shift into neutral and displayed a message indicating that the conditions required to shift were not met. Because the vehicle could not be shifted out of park, the towing company had difficulty loading and unloading the vehicle. The failure occurred during normal highway driving and created a significant safety concern because the engine shut down without warning while the vehicle was in motion. I am aware of NHTSA recall 25v-274 / gm recall n252494000 involving certain gm vehicles equipped with the 6. 2l l87 engine, as well as NHTSA engineering analysis ea25-007 concerning engine failures and loss of propulsion. At the time of this complaint, the dealership has not yet confirmed the specific mechanical cause of my vehicle’s failure. The vehicle is being taken to an authorized GMC dealership for diagnosis. I am submitting this complaint because of the sudden engine failure and loss of propulsion while traveling on a highway.

Was driving the vehicle at 70 mph on the highway without any issues for several hours and suddenly the vehicle lost power and had no propulsion. It went into neutral automatically and the engine shut off while driving. Thankfully I was on a downward slope and could steer the vehicle off the very busy highway. Once safe, I tried to restart the car but the engine would not start or turn over. Roadside assistance came to help as well as a flatbed tow truck. It was taken to a nearby GMC dealer but it remains completely dead despite the battery being fully charged and all of the electronics working. No known error codes are showing up. It’s an l87 engine and was part of the gm recall. The recall work was completed in Nov 2025.

1. What component or system failed or malfunctioned. The fuel pump module failed unexpectedly while the vehicle was being driven. Failure caused the engine to stall, resulting in a complete loss of power and mobility. Unsure if part is available for inspection. 2021 GMC Yukon have a recall n252516900, but our VIN is not included in this. Can our VIN be added to this recall please? 2. How was your safety or the safety of others put at risk? the vehicle abruptly stalled while being driven through a parking lot, causing a complete loss of power and leaving the vehicle disabled in an active traffic area. Because the vehicle could not be shifted out of park, it became an obstruction, creating a hazard for other drivers navigating the parking lot and increasing the risk of a collision. 3. Has the problem been reproduced or confirmed by a dealer or independent service center? yes. After the vehicle was towed to a local mechanic on a flatbed truck, the dealer diagnosed and confirmed that the fuel pump module had failed, which caused the vehicle to stall and lose power. 4. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? the vehicle was inspected by a local repair shot, which diagnosed the failed fuel pump module. The vehicle was also evaluated during the towing process. To my knowledge, the manufacturer, police, or insurance representatives have not separately inspected the vehicle or component. 5. Were there any warning lamps, messages, or other symptoms of the problem prior to the failure, and when did they first appear? prior to the failure, there were no significant symptoms indicating an imminent fuel system failure. When the incident occurred, the vehicle abruptly stalled, lost all power, and displayed a message indicating that the vehicle was "not in a condition to shift," preventing it from being shifted out of park. This message first appeared immediately following event.

The check-engine light first appeared at approximately 42,000 miles. I dropped the vehicle off at the dealership on August 22 and picked it up on September 1. Within two miles of leaving the dealership, the check-engine light came right back on. The dealership initially diagnosed the problem as a lifter and wiring-harness failure. They later determined that the #7 oil-lifter solenoid had an internal short, and the wiring harness was replaced because of damage related to that short. What I still don’t have is an answer to the most important question: what actually caused the failure? based on everything I’ve read about the problems surrounding gm’s 6. 2l engines, I’m concerned this is only the beginning. These are extremely expensive vehicles—with monthly payments that can rival a mortgage—and owners shouldn’t have to wonder whether the engine is going to become an ongoing problem at 42,000 miles. Extending the warranty is helpful, but it doesn’t address the underlying issue or restore confidence in the vehicle. If these 6. 2l engines have a known systemic defect, gm should be required to provide a permanent solution—whether that means replacing the affected engines or offering owners a fair buyback. Consumers paid a premium price. They should be able to expect a premium vehicle that is dependable.

Vehicle loss of power on the interstate at a high rate of speed. Vehicle would not start and could not be put in neutral to safely remove from road.

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On August 20, 2026, while driving my 2024 GMC Yukon xl denali equipped with the 6. 2l v8 engine at approximately 70 mph on the interstate, the vehicle experienced a sudden and complete loss of motive power without adequate warning. The vehicle unexpectedly shifted into neutral and would no longer accelerate or maintain highway speed. This occurred in active interstate traffic and almost resulted in a serious accident as I attempted to maneuver the vehicle out of the flow of traffic. The engine would not restart, and the vehicle had to be towed to a GMC dealership. The GMC dealership subsequently diagnosed that the engine had locked up and determined that the engine requires complete replacement. This failure created an immediate and significant safety hazard for me, my family, and surrounding motorists. My vehicle is affected by the 6. 2l engine recall, and I am extremely concerned about the safety and reliability of the proposed replacement engine. I have become aware of reports from other owners alleging failures involving replacement engines as well, including similar sudden losses of propulsion. I am concerned that replacing the engine may not adequately address the underlying safety risk if replacement engines are experiencing similar failures. I am requesting that NHTSA investigate not only the original engine failure, but also whether replacement engines used as a remedy are adequately correcting the defect. A sudden engine lockup and complete loss of propulsion at interstate speeds presents a serious risk of collision, injury, or death.

I am filing a safety complaint regarding my 2021 GMC Yukon. While driving on the highway during a long-distance trip from [xxx] to [xxx], my vehicle suddenly experienced a serious loss of power, drivability issues, and loss of propulsion. The vehicle began shaking violently, slowing down unexpectedly, and struggling to maintain speed while in active highway traffic at highway speeds. At the time of the incident, the vehicle displayed a warning message indicating “conditions not correct for shift” at approximately 127,506 miles. Shortly after, the vehicle set diagnostic trouble code p0011, which relates to the engine and transmission system not performing as expected and indicates an issue with the variable valve timing (vvt) system affecting engine timing and performance. The vehicle also entered a reduced performance state, and I was advised through the vehicle’s warning system to reduce speed, avoid hard acceleration, and avoid heavy load conditions. Despite following these precautions, the vehicle continued to run poorly and became increasingly unsafe to operate in highway traffic. This created a serious and potentially life-threatening situation, as I was traveling in fast-moving traffic and the vehicle lost normal propulsion and stability. I had to carefully maneuver out of active traffic lanes to avoid a potential collision. The vehicle eventually required roadside assistance/towing due to its inability to operate normally. Diagnostic trouble codes and warning messages were present at the time of failure. After the incident, I checked my VIN through the NHTSA recall system and discovered that my vehicle has three unrepaired safety recalls. Of particular concern NHTSA recall number: 25v274 gm manufacturer recall number: n252494000 this recall involves certain gm vehicles equipped with the 6. 2l v8 l87 engine and describes a manufacturing defect in the connecting rod and/or crankshaft components that may result in engine damag information redacted pursuant to the freedom of information act (foia),.

Our lifters in cylinder 3 were replaced after failing at 40,000 miles. The exact same lifters broke again at 77,000 miles. Both events caused engine failure.

While traveling at highway speeds, my 2017 GMC Yukon sle suffered a sudden, catastrophic active fuel management (afm) valvetrain lifter and camshaft collapse. This caused an immediate and highly dangerous loss of vehicle propulsion in live moving traffic on I-95, creating an extreme physical safety hazard for my family. General motors has extensive, documented internal corporate knowledge of this severe design defect under technical service bulletin TSB #18-na-073.

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The engine tries to die when in park. While stopped at a red light, it died and stated conditions not met to shift. Had to hit park button then restart it. This has happened 4 times. With & without auto start feature on.

This vehicle has been towed into GMC service 3 times to date. #1. 2/2024 (mil 22,662) would not start, low voltage msg, replaced battery. #2. 4/2026 (mil 57,854) vehicle went into n on its own while I was driving down the road, msg on dash "function not available", I stopped and the engine died & would not restart, no engagement from starter motor, found p0615 present, found blown fuse on battery distribution fuse block, replaced. #3. 7/2026 (mil 63,041) vehicle went into n on its own while I was driving down interstate, msg on dash "function not available", I stopped, the engine died and would not restart, found main battery fuse blown, engine seized, found spun rod bearing full of metal debris, replaced engine, radiator, cooler lines, seals, gaskets, bolts, & fluids. My safety was at risk as I was driving down a highway and the interstate 2 of the times the vehicle put itself in n. The problem has been confirmed by the dealer. The vehicle has been inspected by the dealer's service dept. Prior to these incidents I did not notice any symptoms that would have alerted me of what was to come. **this report is referring to my latest incident which was engine seizure. Recalls have been performed, #1. 5/2025 "reprogrammed serial data module" & #2. 11/2025 "engine loss of propulsion recall", replaced oil with 0w-40 & "ecm software update recall", replaced ecm with sps.

On July 14, 2026, I experienced a serious fuel system failure with my 2023 GMC denali. That morning, I filled the vehicle with a little over 20 gallons of fuel at a gas station approximately two miles from my home. Later in the day, I made a short trip to my neighborhood swimming pool, roughly 1. 5 miles round trip, with no unusual noises or warnings from the vehicle. Approximately two hours after returning home, I entered the vehicle to run an errand. When I shifted into reverse and began backing out of my carport, I immediately heard a scraping noise on the concrete. I stopped the vehicle and inspected underneath. At that point, I discovered that the entire fuel tank had fallen out of the vehicle and was resting on the ground. I contacted roadside assistance, and the vehicle was towed to the dealership. The dealership informed me that the fuel tank support straps were missing, which allowed the tank to detach and fall. I personally searched along all the routes I had driven earlier that day and did not locate any straps or debris. The tank itself showed no impact damage, suggesting it dropped cleanly rather than being torn loose by road contact. Although the vehicle is relatively new, my bumper to bumper warranty expired in September 2025, and I was charged for the repair. I have included photos taken before and during the tow, as well as the dealership’s invoice. I am extremely concerned about the safety implications of this failure. If the tank had fallen while I was driving at interstate speeds (approximately 70 mph), it could have caused a catastrophic fire hazard, loss of vehicle control, or danger to other motorists. I do not know how long the vehicle had been operating without fuel tank straps, nor why there were no warnings or indications of a structural issue. I also question why the dealership did not treat this as a manufacturing or assembly defect, given that fuel tank straps should not detach under normal use. . . . Ran out of characters. . .

The engine in my 2022 GMC Yukon xl equipped with the 6. 2l l87 v8 experienced a sudden loss of power while traveling at interstate speed. The vehicle had previously received the gm l87 engine recall remedy. Despite the recall being completed, the engine failed, leaving me and my family in a dangerous situation. The vehicle is currently at a GMC dealership and is available for inspection upon request. The sudden loss of engine power on a busy interstate created an immediate safety hazard. Traffic was traveling at highway speeds, and the vehicle rapidly lost the ability to maintain speed, increasing the risk of being struck from behind or being involved in a serious collision. My family was in the vehicle at the time, making the incident especially concerning. The GMC dealership has confirmed that the engine failure is related to the l87 engine issue and advised that the repairs will be covered under the applicable warranty/recall-related coverage. Additionally, after the original recall service was performed, an expanded recall was added to my VIN, further indicating that the original remedy may not have fully addressed the underlying defect. The vehicle is currently being inspected by the authorized GMC dealership. Prior to the engine failure, there were no warning signs indicating an imminent catastrophic failure. The recall service had already been completed, leading me to believe the vehicle was safe to operate. The engine nevertheless failed after the recall remedy, raising concerns that the corrective action may not be sufficient to prevent future failures.

I am reporting a serious safety defect and unreasonable delay in addressing it under safety recall n252494000 (l87 engine – loss of propulsion). My GMC Yukon has an illuminated check engine light and is now also overheating. According to gm’s own customer service r, this can lead to knocking, unusual engine noises, hesitation, high rpms, abnormal shifting, reduced propulsion, and sudden loss of propulsion while driving, increasing the risk of a crash. I have contacted multiple dealerships for urgent repair: cappllino GMC keller Chevrolet joe basil all three have advised me that they do not have enough technicians to get my vehicle in for repair. Each has urged me to continue driving the vehicle despite the active check engine light and recall, and all have refused to provide a loaner vehicle. I have also contacted GMC corporate directly for intervention. Instead of providing a loaner or expediting repairs, they have only offered post-repair rental reimbursement (up to $44/day after a repair order is opened). This leaves me with no safe transportation option. I have been told I can “drop off” the vehicle, but I have no alternative way to get home or to work. GMC and its dealerships are putting my safety (and the safety of other road users) at serious risk by directing me to continue operating a recalled, overheating vehicle with an active check engine light while refusing to provide any loaner or timely repair. My vehicle has 34,700 miles and is nearing the end of its warranty coverage, which raises additional concerns about potential delay tactics. Please review: the l87 engine defect and related check engine/overheating issues in GMC Yukons. GMC’s handling of this recall, including widespread failure to provide loaners and instructions to customers to keep driving defective vehicles. I authorize the release of my contact information to GMC to assist with the investigation. Attachments I can provide: screenshots of communications with GMC.

Driving on highway at 80 mph and accelerator stopped working and car turned off. We had to coast off toll rd and hope for the best. No warning and happened with our whole family in the car. I had a recall notice from manufacturer but last time I tried contacting manufacturer/dealer they said no resolution was available to repair recall yet and that I couldn’t drop off my vehicle.

My 2021 GMC Yukon xl recently suffered a failure of its fuel pump control module. This occurred at just 44,000 miles, mere weeks after my manufacturer warranty expired in June of 2026. This issue goes far beyond a financial inconvenience or a matter of consumer reimbursement; it is a severe, life-threatening safety hazard that gm has failed to permanently resolve. My experience: sudden power loss while towing the gravity of this part failure became clear during a recent drive. I configuration-matched this vehicle—a heavy-duty Yukon xl with a 6. 2l engine and a 4x4 towing package—specifically for its capacity to safely haul heavy loads. While traveling with a trailer attached, the vehicle experienced a sudden, catastrophic loss of engine power. Without warning, the engine sputtered and died. Had this occurred on a steep incline, a blind curve, or in heavy highway traffic, a catastrophic multi-vehicle collision would have been entirely unavoidable. Critical safety hazards and concerns •inability to maintain speed, loss of vital assist systems, & compounded towing risks systemic failure and inadequate remediation what makes this situation entirely unacceptable is that this specific vehicle was already subject to previous gm safety campaigns regarding this exact component (including safety recall #n212332040 and subsequent emission recall #n252516900). Gm is fully aware that their supplier produced defective modules that are prone to premature internal short-circuits. Yet, their remediation strategy has been entirely inadequate. By managing this through piecemeal, phased rollouts and limited VIN inclusion lists, they are leaving dangerous vehicles on the road until the point of failure. Drivers are effectively acting as crash test dummies, waiting for their engines to die in dangerous environments before gm acknowledges that their specific VIN was fitted with the defective supplier part.

I was driving down the highway and all at once a bunch of different lights and emergency warnings started flashing on my dashboard and my car was almost like sputtering like it wasn’t getting the gas it needed or something. You could feel lots of movement right up front and I was forced to pull over and get towed. They said the engine would need to be completely replaced.

6/16 vehicle issues while driving home from work. Rough idle, multiple check engine lights coming on, multiple warnings display on dashboard. Vehicle in limp mode from work to home. 6/20 while driving in roanoke rough idle began. Vehicle check engine light appeared, limp mode only lasted for less than 30 seconds before it went back to normal. 6/23 vehicle issues began again while driving to work. Pulled into parking lot, turned vehicle off and restarted. Vehicle seemed back to normal. Made appointment through GMC app for first available on 6/29. Leaving work vehicle check engine lights came on again and went into limp mode. 26,764 miles. Drove straight over to hart GMC (2 miles away) and dropped it off. 6/30 picked up vehicle at hart GMC. Miss fire on cylinder #3. Replaced spark plug #3 and cleared all dtcs codes. 8/6 oil change with consumption test started 29,072 miles 8/28 engine oil low-add oil alarm. Instructed by dealer to not tamper with test. Must drive 2000 miles before returning vehicle to validate consumption test. 29,728 miles 8/30 pulling into drive way rough idle began. Vehicle check engine light appeared, limp mode, multiple lights. Scanned with obd2 scanner- p0303 code. Misfire cylinder 3. 8/31 vehicle towed from home to hart motors 29,860 miles. Scanned by service showing p0300 codes along with other codes. I have documented all events with this engine since owning. Concerned the engine would run out of oil before validating consumption test (2000 miles). Dealer told me to keep driving even if it says add oil. Engine historically 2 qts low when add oil warning flashes.

Vehicle had previously undergone the gm 6. 2l engine recall inspection on October 17, 2025, and was determined to have passed. On June 13, 2026, at approximately 80,390 miles, the vehicle suddenly lost propulsion while being driven with five children in the vehicle. The vehicle became inoperable and required towing. Dealer subsequently diagnosed engine failure and has ordered a replacement engine. This failure happened with out warning.

Check engine light comes on and an alert says "acceleration reduced" dealer says the coolant control valve is bad but the engine never overheats but the fans are running max speed 100% of the time.

This is a supplemental report to my original complaint (NHTSA id xxx) regarding my 2024 GMC Yukon (VIN [xxx]). I am providing additional detail: prior to gm's recall being issued, I contacted hatchett Buick GMC by phone and visited in person on multiple occasions reporting engine sputtering, stalling, hesitation, and total loss of power and electrical shutdown while driving. I was repeatedly told these were minor issues not affecting anyone and not to worry about them. As a result, the vehicle was not formally serviced for these issues until September 2025 — roughly three months after the recall was finally announced, more than a year after I purchased the vehicle. Since that recall repair and a subsequent "best guess" repair performed by gm technicians (their own description, not mine), the vehicle continues to sputter, hesitate, stall, and intermittently lose power. I have ongoing safety concerns driving this vehicle information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Engine overheated and performed an emergency shutdown while driving through atlanta on my way to vacation with my family. We lost propulsion and had to cross 5 lanes of traffic to find a shoulder to pull over to. The engine shut down and we were left stranded 500 miles from home with our 3 children in a boiling car. The vehicle was inspected and passed the recall test 6 weeks prior to this incident. After the first failure we attempted to extend our power train warranty to which we were told it had too many miles by gm. The gm dealership and service center where the vehicle was towed confirmed the engine needed to be replaced and gm confirmed it falls under their extended warranty. However, gm refuses to cover any additional expenses incurred from their engine failure.

Took car in to have it checked for recall on engine and have oil changed to new standards with wd40 was told the engine and car was fine “just use this new oil” a month later was driving and engine would not shift come to find out our transmission was going out it was replaced thanks to our extended warranty (even tho it only had 98,000 miles on it) a week after a fuel pump was out and we had to pay to replace it. There were never check engine signs and no signs of the car having failure truly it ran great until the new oil.

1. Xxx xx— gm recall notification (recall no. N252494000) I received official notification from general motors of recall n252494000 affecting my vehicle. I brought the vehicle to [xxx] as directed to have the recall remedy performed. 2. Xxx — first report of engine propulsion issues I reported engine propulsion concerns to jim ellis. This was my first formal complaint regarding the performance of the vehicle following the recall remedy. 3. Xxx — oil type change performed by jim ellis jim ellis performed an engine oil type change, switching to 0w-40 oil, and advised me that this change would serve as the fix for recall n252494000. I accepted this remedy in good faith. 4. Xxx — low oil warning light activated approximately nine months after the recall remedy, and well before the end of the recommended oil life cycle, the low oil warning light activated on my dashboard. This is abnormal and indicative of excessive oil consumption. I returned to jim ellis, who performed a fresh oil change and placed my vehicle on a 6,000-mile oil consumption test — an acknowledgment that an oil consumption problem exists. 5. Xxx — active engine misfires, jerking, and flashing check engine light while operating my vehicle on Sunday, may 31, 2026, I experienced severe engine jerking and misfires. The check engine light began flashing — not steady — which I understand to indicate an active and serious engine misfire event. I was genuinely concerned for my personal safety and immediately parked the vehicle. It has not been driven since. 6. Xxx — gm corporate case opened I contacted gm customer care and was assigned corporate case number information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I was driving in the left lane on [xxx] , a 4 lane interstate just outside of cleveland when I lost engine propulsion. Engine rpms dropped to under 1000rpm, and quit responding to throttle. I had to change lanes and coast until there was a shoulder available to stall out at while I awaited a tow. No warning lamps until I tried to restart vehicle. Engine cranked but wouldnt start. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I was traveling with my family on the ohio turnpike. We were traveling west in our 2023 GMC Yukon denali when we lost all propulsion and the engine seized. There was no warning lights or other symptoms prior to this incident on may 3, 2026. In fact, I had the vehicle in for the prescribed recall to test the engine for the known defect earlier in 2026. The vehicle passed that test and was given the upgraded oil change to presumably prevent the engine failure in the future. It did not work. Our safety and others on the turnpike were at risk while we were traveling at highway rates of speed with sudden loss of all propulsion. The vehicle was towed that evening to local gm dealer - yark chevy in [xxx] . Upon inspection on may 5, 2026, the dealership informed me the engine had seized and would be replaced by gm. They were unable to provide a timeline for this repair. I have the tow expense of $260. 70 and now the uncertainty of when I might have a vehicle back. The safety of my family and all others traveling the ohio turnpike that date were at significant risk. The vehicle remains at yark chevy in perrysburg, ohio available for inspection upon request. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The vehicle suddenly began vibrating noticeably when idling and at low speeds. About 30 minutes after this started happening a warning lamp lit up. We drove the vehicle about 2 miles to a local auto parts store to get an initial computer diagnosis of the issue. The test resulted in a code of "p0304" which detected a cylinder #4 misfire and recommended a fuel injector replacement. We brought the vehicle to a local mechanic to get the issue further evaluated. After this evaluation, it was determined that the cylinder #4 misfire was related to a lifter failure. The mechanic explained that this situation could possibly have caused more damage, specifically to the camshaft, but that job was bigger than he was willing to take on. He recommended we get the vehicle towed to the dealership for further evaluation. He also informed us that this situation was common with the engine in this vehicle and GMC is aware of it. He directed us to some articles online that elaborated on the potential known issues related to the automatic fuel management (afm) system and the related engine damage. The vehicle was towed to a local GMC dealership for evaluation. They found the failed cylinder #4 with associated lifter failure and damaged camshaft. We went forward with the repair at the dealership. We asked the dealership about the known engine issues with this vehicle. They acknowledged the widespread issues but informed us that our particular VIN has not been included in any recalls or safety notifications, so we were responsible for the repairs. The vehicle spent nearly 3 weeks at the dealership. One of the parts was on backorder due to a national shortage, which delayed the repair by about one week. That seems to imply that the parts involved in this repair are in high demand, which raises the question of this being a manufacturing/parts issue that may need to be investigated further.