Showing 64,800 complaints for GMC
Incident date: Aug 14, 2026
I bought this truck from a dealer at the end of july 2026 and it only had 27k miles on it. I got the carfax and saw all the times of service and checked that this truck was inspected and went to the new oil type, filter and cap. It also was showing it had the special warranty due to recall. So i assumed everything was good to go and the truck was relaicle. Not even 18 days later and less than 800
... miles I broke down mid drive. I was traveling at 45 mph and lost all power and almost caused an accident trying to get over and parked safely. There was no warning light or indication of it breaking down or having a mechanical issue. It went to the dealer and they diagnosed it as complete engine failure due the issue GM is having currently. They did order a new motor and it took two weeks to get in but they are in the process of the engine swap as we speak. I am sure i will get more details this week....but I am concerned now amd honestly wish I wouldnt have bought this truck considering I am seeing reports of new motor swaps having catastrophic engine failure two or three times. So at this point im in limbo waiting for the new install and hopefully it doesnt fail againRead more
Incident date: Apr 8, 2025
Truck died while driving on a major highway due to a faulty fuel pump module. The vehicle was blocking an intersection. The vehicle could not be put into neutral without the engine running because of the electronic transmission. Could not move the vehicle out of the intersection and out of traffic. I found out later that to put the truck in neutral requires a special tool, and going under the tr
... uck to engage the bypass, which is very difficult and unsafe on a major roadway.Read more
Incident date: Jun 29, 2026
We were told when we purchased our 2026 GMC Sierra 1500 that all the engine problems have been remedied. Purchased our new truck January 3, 2026 put 2001 miles on the truck went on June 29. The engine suddenly just stopped while driving on the highway. We were able to pull over unable to ever get it to start forced to have it towed to a nearby GMC dealer where it has been ever since were told it h
... ad to have a complete new engine put in we have corresponded with General motors on three different occasions we still sit with no offer as we did apply for a lemon law buyback but General Motors continues to sell these vehicles which is very deceptive and misleading as this situation was not remedied in any 25 or 26 models.Read more
Incident date: Aug 22, 2026
The Engine made a noise and it seems to me that this engine will loose power and leave me in a situation that could cause an accident or breakdown in the middle of a bad situation. I don't trust this truck and its engine and i refuse to drive it now.
Incident date: Aug 14, 2026
Aug 14th, 9:49 pm - Vehicle was placed in park and driver got out. A few seconds later the vehicle started moving forward under its own power towards the driver who was now infront of vehicle walking foward away from vehicle. Passenger hopped over the driver seat to press on brake pedal to stop vehicle. At same time, driver turned around and noticed vehicle moving towards him. Passenger was able t
... o stop vehicle but not before it ran off the driveway and into and over a recreational firepit area. Driver was on opposite side of this. Driver got in to vehicle, verified transmission was now fully engaged in Park, and reversed the vehicle off firepit area. Damage to both vehicle, and firepit ring and landscaping area. Security footage later confirmed vehicle was placed in park, brake lights went out, and vehicle remained stationary for approximately 3 to 5 seconds before driver exited vehicle. It was when driver shut door that vehicle then moved, as if the Parking pin did not engage or failed to stay engaged. Owner traded vehicle in with another dealer soon after, due to other ongoing issues involving the steering and brake system that had not been resolved. Approximately 11,580 miles on vehicle at the time of incident. No personal injuries reported.Read more
Crash
Incident date: Jun 18, 2026
Warning lights; ESC, traction control; collision warning etc, all come on. Taken to GMC dealership and tell me its "left rear wheel sensor". Cost $900. After supposed repairs, warning lights still do not go off. Now the dealership is saying its the ABS and the whole thing needs to be replaced. $2100
Incident date: Jun 18, 2026
Warning lights; ESC, traction control; collision warning etc, all come on. Taken to GMC dealership and tell me its "left rear wheel sensor". Cost $900. After supposed repairs, warning lights still do not go off. Now the dealership is saying its the ABS and the whole thing needs to be replaced. $2100
Incident date: Jun 18, 2026
Warning lights; ESC, traction control; collision warning etc, all come on. Taken to GMC dealership and tell me its "left rear wheel sensor". Cost $900. After supposed repairs, warning lights still do not go off. Now the dealership is saying its the ABS and the whole thing needs to be replaced. $2100
Incident date: Oct 27, 2025
2019 GMC Sierra 1500 Denali Ultimate (6.2L L87 V8 Engine)Description of Safety Defect & Incident Chronology: XXX (49,801 miles): While idling in my driveway, the engine began ticking loudly, running roughly, and ultimately stalled. The vehicle was towed to Hight Chevrolet in [XXX]. The dealership stated they test-drove the vehicle twice while monitoring live data, could not duplicate the noise, an
... d released the truck back to me.XXX (57,920 miles): The engine began ticking loudly again. I returned the vehicle to the dealership. Upon inspection, technicians found metal debris in both the oil filter and the oil pan. The dealership diagnosed a catastrophic bottom-end engine failure.Resolution: The original engine was replaced with a GM remanufactured crate engine, covered under the GM factory warranty.Safety Concern:Although my vehicle is a 2019 model, it suffered the exact same catastrophic bottom-end bearing failure currently being investigated by NHTSA for 2021–2026 GM 6.2L L87 engines. This defect poses an imminent safety hazard, as a sudden bottom-end failure can cause the engine to seize without warning, resulting in a complete loss of motive power and propulsion at highway speeds, drastically increasing the risk of a crash. Furthermore, despite GM's claims regarding limited production windows, this case proves the defect is present in earlier 2019 model years. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)Read more
Incident date: Aug 21, 2026
I was Driving down the interstate when the RPMS on my car increased and my car started to shutter. I went to get off the roadway and it put itself into neutral and lowered my speed. when i got On the shoulder it stalled and would not turn back on. I had To be towed. To this point, my car has been in the shop for over a week with no solution.
Incident date: Aug 21, 2026
I was Driving down the interstate when the RPMS on my car increased and my car started to shutter. I went to get off the roadway and it put itself into neutral and lowered my speed. when i got On the shoulder it stalled and would not turn back on. I had To be towed. To this point, my car has been in the shop for over a week with no solution.
Incident date: Jun 5, 2026
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.Read more
Incident date: Jun 5, 2026
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.Read more
Incident date: Jun 5, 2026
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.Read more
Incident date: Aug 1, 2026
I’m currently on my third motor as a result of the L87 engine loss. When I bought the vehicle, I was not aware that the engine had already been replaced however, due to hearing a tick, I brought my vehicle to the dealership for the recall and was told that this is not the original engine, but they had the paperwork for this engine as well. Nonetheless, the engine “passed” their inspection. T
... hey changed my oil and replaced my cap. Within six months, I threw a Rod. Not only did I have a horrible experience with the dealership, my new motor is also ticking.Read more
Incident date: Apr 30, 2026
My vehicle previously experienced engine problems severe enough that the engine was replaced. Despite the engine replacement, the vehicle is continuing to experience an engine misfire, and the check-engine light has been flashing. A flashing check-engine light and active misfire are a serious safety concern because the vehicle may experience rough running, reduced power, hesitation, or potential l
... oss of power while driving. The fact that the misfire continues after an engine replacement raises concerns that the underlying problem was not resolved or that another component or system is malfunctioning. The exact cause of the current misfire is UNKNOWN at this time. The vehicle and/or affected components are available for inspection upon request.Read more
Incident date: Aug 14, 2026
Vehicle has 43k miles on it and a has a failed oil pump, already switched to the heavier oil and still have engine issue
Incident date: Jul 28, 2026
Early this year the crankshaft seized while driving. The engine was promptly replaced and I carried on my way. Then 7k miles later, the replacement engine that GM sent also blew up and was a total replacement. Hopefully the third engine lasts longer.
Incident date: Feb 28, 2026
1 - The Engine or something electrical, possibly the ECM, failed or malfunctioned, and yes, it is available for inspection. 2 - The vehicle lost power, reduced speed, was hard to steer, and I couldn't put the hazard lights on; this occurred twice while driving on the highway, once I was driving at approx 75 mph. The results could have been catastrophic not only to myself but to others on the roa
... d. These two events are not the only times the truck did this. 3 - No. 4 - No. I filed a claim with GM, but it has been approximately a month, and I've received no updates. 5 - No. Further: This event has occurred 6 times. I've taken it to the dealership three. They cannot duplicate the issue, so no repairs have been done. Apparently, approximately 100 codes come up, but they cannot diagnose the problem.Read more
Incident date: Feb 28, 2026
1 - The Engine or something electrical, possibly the ECM, failed or malfunctioned, and yes, it is available for inspection. 2 - The vehicle lost power, reduced speed, was hard to steer, and I couldn't put the hazard lights on; this occurred twice while driving on the highway, once I was driving at approx 75 mph. The results could have been catastrophic not only to myself but to others on the roa
... d. These two events are not the only times the truck did this. 3 - No. 4 - No. I filed a claim with GM, but it has been approximately a month, and I've received no updates. 5 - No. Further: This event has occurred 6 times. I've taken it to the dealership three. They cannot duplicate the issue, so no repairs have been done. Apparently, approximately 100 codes come up, but they cannot diagnose the problem.Read more
Incident date: Feb 28, 2026
1 - The Engine or something electrical, possibly the ECM, failed or malfunctioned, and yes, it is available for inspection. 2 - The vehicle lost power, reduced speed, was hard to steer, and I couldn't put the hazard lights on; this occurred twice while driving on the highway, once I was driving at approx 75 mph. The results could have been catastrophic not only to myself but to others on the roa
... d. These two events are not the only times the truck did this. 3 - No. 4 - No. I filed a claim with GM, but it has been approximately a month, and I've received no updates. 5 - No. Further: This event has occurred 6 times. I've taken it to the dealership three. They cannot duplicate the issue, so no repairs have been done. Apparently, approximately 100 codes come up, but they cannot diagnose the problem.Read more
Incident date: Jul 12, 2026
Engine making noise during a trip took to dealership and they reported engine is bad and needs to be replaced because it would freeze on the road. Vehicle has 7000 miles.
Incident date: Aug 15, 2026
On XXX around noon in medium traffic I was traveling on the [XXX] southbound at about 65 miles per hour when the engine suddenly stopped with no warning. To make matters worse the dash instructed me to apply the brake to start?? Not at 65 mph! I was able to coast onto the offramp safely and call for a tow to the GMC dealer in [XXX]. They diagnosed the failure to the engine seizing. I was fortunat
... e to pull off the freeway as being an experienced driver for more than 50 years although it would be anyone's opinion that a less experienced driver could have been injured or worse. My fear is that the replacement engine that GM will install again have the same problem at any time in the future with no warning and I or my family will not be as fortunate the next time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)Read more
Incident date: Aug 29, 2026
Oil leaks from the timing cover on the top and bottom.
Incident date: Aug 28, 2026
Driving approximately 75mph on a local highway, my engine shut down with no warning, the screen said to shift into neutral to restart but nothing happened so I was stranded along the side of the highway and had to wait 2hrs for a tow truck in the middle of the night and the engine is currently locked up.
Incident date: Jun 6, 2026
My vehicle "passed" the engine recall only to have the engine blow at 33,000 miles. My vehicle was at the dealership for 52 days most of the time was spent waiting for the new engine. Dealership was amazing, GMC however is the worst. My new engine has about 1,000 miles on it and it stutters occasionally when the auto start turns on.
Incident date: Jul 30, 2026
The engine failed at 5383 miles while driving on remote highway in Nebraska.
Incident date: Aug 14, 2026
ENGINE STARTED KNOCKING AT 18K MILES AND TOOK TO DEALER AND THEY FOUND METAL IN THE FILTER AND INSTALLED A NEW ENGINE AND ALSO REPLACED THE MIDPLATE GASKET ON THE VALVEBODY DUE TO A HARSH DOWNSHIFT WITHOUT CODES IN THE SYSTEM THIS ENGINE IS GOING ON 2K MILES AND IT SEEMS TO BE FINE NOW BUT THE PROBLEM WITH 6.2 WAS ONLY SUPPOSED TO BE ON THE 21-24 MODELS AND MINE IS A 25 MODEL AND ALREADY HAD A REP
... LACED AND NOTHING FROM GM WAS SAID TO EXTEND THE WARRANTY ON THIS MODEL AND POWERTRAINRead more
Incident date: Aug 14, 2026
ENGINE STARTED KNOCKING AT 18K MILES AND TOOK TO DEALER AND THEY FOUND METAL IN THE FILTER AND INSTALLED A NEW ENGINE AND ALSO REPLACED THE MIDPLATE GASKET ON THE VALVEBODY DUE TO A HARSH DOWNSHIFT WITHOUT CODES IN THE SYSTEM THIS ENGINE IS GOING ON 2K MILES AND IT SEEMS TO BE FINE NOW BUT THE PROBLEM WITH 6.2 WAS ONLY SUPPOSED TO BE ON THE 21-24 MODELS AND MINE IS A 25 MODEL AND ALREADY HAD A REP
... LACED AND NOTHING FROM GM WAS SAID TO EXTEND THE WARRANTY ON THIS MODEL AND POWERTRAINRead more
Incident date: Aug 14, 2026
ENGINE STARTED KNOCKING AT 18K MILES AND TOOK TO DEALER AND THEY FOUND METAL IN THE FILTER AND INSTALLED A NEW ENGINE AND ALSO REPLACED THE MIDPLATE GASKET ON THE VALVEBODY DUE TO A HARSH DOWNSHIFT WITHOUT CODES IN THE SYSTEM THIS ENGINE IS GOING ON 2K MILES AND IT SEEMS TO BE FINE NOW BUT THE PROBLEM WITH 6.2 WAS ONLY SUPPOSED TO BE ON THE 21-24 MODELS AND MINE IS A 25 MODEL AND ALREADY HAD A REP
... LACED AND NOTHING FROM GM WAS SAID TO EXTEND THE WARRANTY ON THIS MODEL AND POWERTRAINRead more
Incident date: Nov 21, 2025
Two problems with this vehicle: 1) Transmission occasionally slips on the 2-3 shift which the dealer says he cannot duplicate. Vehicle was brought in four times for this problem. According to the dealer GM corporate has stated the transmission is working within normal parameters, since no codes were found. 2) Vehicle auto braking randomly slams on the brakes with nothing in its path. Dealer states
... turn off system to just Alert only not Alert and Brake. No codes were set. Fortunately no one was behind me as this could have caused me to be rear ended by another vehicle. In both cases it appears that if no codes are set the problem does not exist. Nov. 21, 2025, Feb. 12, 2026, July 09, 2026, Aug. 28, 2026.Read more
Incident date: Nov 21, 2025
Two problems with this vehicle: 1) Transmission occasionally slips on the 2-3 shift which the dealer says he cannot duplicate. Vehicle was brought in four times for this problem. According to the dealer GM corporate has stated the transmission is working within normal parameters, since no codes were found. 2) Vehicle auto braking randomly slams on the brakes with nothing in its path. Dealer states
... turn off system to just Alert only not Alert and Brake. No codes were set. Fortunately no one was behind me as this could have caused me to be rear ended by another vehicle. In both cases it appears that if no codes are set the problem does not exist. Nov. 21, 2025, Feb. 12, 2026, July 09, 2026, Aug. 28, 2026.Read more
Incident date: Nov 21, 2025
Two problems with this vehicle: 1) Transmission occasionally slips on the 2-3 shift which the dealer says he cannot duplicate. Vehicle was brought in four times for this problem. According to the dealer GM corporate has stated the transmission is working within normal parameters, since no codes were found. 2) Vehicle auto braking randomly slams on the brakes with nothing in its path. Dealer states
... turn off system to just Alert only not Alert and Brake. No codes were set. Fortunately no one was behind me as this could have caused me to be rear ended by another vehicle. In both cases it appears that if no codes are set the problem does not exist. Nov. 21, 2025, Feb. 12, 2026, July 09, 2026, Aug. 28, 2026.Read more
Incident date: Aug 26, 2026
The vehicle was delivered from the factory with a severe size mismatch between its primary rolling stock and its emergency spare tire. The truck features factory-installed 20-inch wheels and tires but was manufactured and shipped with an undersized 18-inch spare tire assembly secured underneath the bed. On a heavy-duty 3500-series truck built for heavy towing and hauling, utilizing a drastically d
... ifferent tire diameter during an emergency road event forces the rear differential and transfer case to spin at mismatched speeds. This creates an immediate risk of sudden mechanical drivetrain failure, loss of vehicle control, or compromised braking stability while operating under load on public highways. Consumers relying on factory equipment during emergency roadside scenarios should not be exposed to hidden mechanical hazards due to factory assembly omissions. Upon discovering the factory defect, the local dealership attempted remediation by supplying a shop take-off wheel and an aged, three-year-old tire (DOT 2223). This highlights that while individual dealerships scramble to fix these factory omissions with makeshift inventory, consumers purchasing new heavy-duty vehicles are still absorbing compromised, aged safety equipment due to lack of manufacturing quality control. I have also filed a complaint with GM and have requested immediate remediation with a correct new tire and wheel and am waiting for a response.Read more
Incident date: Aug 26, 2026
The vehicle was delivered from the factory with a severe size mismatch between its primary rolling stock and its emergency spare tire. The truck features factory-installed 20-inch wheels and tires but was manufactured and shipped with an undersized 18-inch spare tire assembly secured underneath the bed. On a heavy-duty 3500-series truck built for heavy towing and hauling, utilizing a drastically
... different tire diameter during an emergency road event forces the rear differential and transfer case to spin at mismatched speeds. This creates an immediate risk of sudden mechanical drivetrain failure, loss of vehicle control, or compromised braking stability while operating under load on public highways. Consumers relying on factory equipment during emergency roadside scenarios should not be exposed to hidden mechanical hazards due to factory assembly omissions. Upon discovering the factory defect, the local dealership attempted remediation by supplying a shop take-off wheel and an aged, three-year-old tire (DOT 2223). This highlights that while individual dealerships scramble to fix these factory omissions with makeshift inventory, consumers purchasing new heavy-duty vehicles are still absorbing compromised, aged safety equipment due to lack of manufacturing quality control. I have also filed a complaint with GM and have requested immediate remediation with a correct new tire and wheel and am waiting for a response.Read more
Incident date: Aug 26, 2026
Had a check engine light come on a couple months ago and vehicle went into Reduced Accelaration safety mode. Come to find out, it was a faulty Valve Body. I came out of pocket for $2,800 to get it replaced because GMC said the Valve Body/Special Coverage was not assigned to this VIN. Even though it was a 2022 with 60,000 miles on it fitting every criteria of the exact recall (mind-blowing). Now fa
... st forward to now, the same check engine light and reduced acceleration fault is active associated with a Transmission Control Module Fault. This truck is entirely too new and taken care of to be dealing with these types of major issues. It’s been a severe inconvenience for my wife as it’s her daily driver. To make matters worse, the lack of support and assistance from GMC has made us go from very loyal customers and supporters, to now seeing how quickly we can get away from this disaster of a vehicle and Customer Service.Read more
Incident date: Aug 26, 2026
Had a check engine light come on a couple months ago and vehicle went into Reduced Accelaration safety mode. Come to find out, it was a faulty Valve Body. I came out of pocket for $2,800 to get it replaced because GMC said the Valve Body/Special Coverage was not assigned to this VIN. Even though it was a 2022 with 60,000 miles on it fitting every criteria of the exact recall (mind-blowing). Now fa
... st forward to now, the same check engine light and reduced acceleration fault is active associated with a Transmission Control Module Fault. This truck is entirely too new and taken care of to be dealing with these types of major issues. It’s been a severe inconvenience for my wife as it’s her daily driver. To make matters worse, the lack of support and assistance from GMC has made us go from very loyal customers and supporters, to now seeing how quickly we can get away from this disaster of a vehicle and Customer Service.Read more
Incident date: Aug 17, 2026
FROM DEALER ASSESSMENT Concern - CUSTOMER STATES WHEN VEHICLE IS ACCELERATING THERE IS A RATTLE Correction - test drove and was able to duplicate rattle/knocking from the engine. checked oil level and condition verified both are good. checked for bulletins and followed 23-NA-170. compared vehicle noise to noise is video and noise is nearly identical. removed oil filter and inspected for debris
... , found heavy amounts of metal debris present in the filter. performed crankshaft end play mesasurement and found that the crankshaft end play is way over spec at 1/4 of an inch. recommend replacing the engine assembly per bulletin Parts) 1x ENGINE 2x (S)GASKET $0.00 $0.00 6x (S)BOLT 1x BOLT 1x exhaust pipe connector gaskets both sides $0.00 8x (S)GASKET 1x fuel feed pipes all $0.00 1x (S)SEAL KIT 1x (S)GASKET $0.00 1x (S)SEAL 1x W-(S)RADIATOR $0.00 1x (S)HOSE 1x coolant $0.00 1x oil filter 1x oil $0.00 Approved 2026-08-18 Labor: $0.00 Parts: $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 Subtotal Line B: $0.00 *Subtotal is before Shop Charge and TaxesRead more
Incident date: Jul 4, 2026
My 2024 GMC Yukon Denali equipped with the 6.2L L87 V8 experienced an engine failure on July 4, 2026. Prior to the failure, there was no visible damage, warning, or other evidence that the engine was about to fail. I drove the vehicle to purchase fireworks and shut the vehicle off normally when I arrived. When I returned to the vehicle after shopping, the engine problem became apparent. There had
... been no noticeable indication of an engine failure before I turned the vehicle off. The vehicle was subsequently taken to a GM dealership, where the engine failure was confirmed and ultimately required replacement of the 6.2L L87 engine. The vehicle remained out of service from July 4, 2026, until it was returned to me on August 21, 2026. The original failed engine was in the possession of the servicing GM dealership I purchased the car from. Not even 8 months later of purchase the vehicle needed a 3rd engine (original, recalled engine, warranty engine). The lack of warning before the failure is a significant safety concern to me. The vehicle had been operating immediately before I parked it, and there were no apparent symptoms that would have alerted me that a major engine failure was imminent. Had the failure occurred while the vehicle was traveling at highway speed or in traffic, the sudden loss of engine operation could have created a dangerous situation. The failure was confirmed by the GM dealership and resulted in replacement of the L87 6.2L V8 engine. I am submitting this complaint to document the failure and because of continuing concerns regarding the L87 6.2L V8 and the effectiveness and long-term reliability of the recall remedy. I am still currently waiting for the repair work documentation for the new (assuming it was new) motor. I have attached attempts to talk to GM, app incidents, repair work being completed.Read more
Incident date: Mar 16, 2026
I am a Canadian owner of a 2023 GMC Sierra 1500 AT4 equipped with the 6.2L L87 engine. VIN: [XXX]. I purchased the vehicle new. I am reporting this because my experience appears directly relevant to NHTSA Engineering Analysis EA26005 concerning L87 engine failures after Recall 25V-274 remedies. The GM recall remedy/oil change was performed at 103,503 km (64,315 mi). At 130,695 km (81,210 mi), t
... he original engine suffered a catastrophic failure and completely seized. The engine could not even be rotated manually at the crankshaft. GM replaced the complete engine. At 142,541 km (88,571 mi), only 11,846 km (7,361 mi) later, I returned for the first oil change on the replacement engine. I told the dealer that the vehicle was behaving abnormally, especially the transmission, which was shifting strangely. After inspection, the dealer determined that the replacement engine was beginning to seize. The increased resistance from the engine was causing the abnormal transmission behavior. The complete engine was replaced AGAIN. The vehicle now has 148,560 km (92,310 mi), meaning this second replacement/third engine has only about 6,019 km (3,740 mi). I am again noticing symptoms similar to those that occurred before the previous engine failure. I cannot confirm that this engine will fail, but after two previous engine failures, I am very concerned. This vehicle has therefore had two L87 engines: the original engine and one replacement. One replacement engine itself began seizing after less than 12,000 km. I believe these repeated failures after both the recall remedy and a complete engine replacement are directly relevant to EA26005 and the safety risk of sudden loss of propulsion. I have GM/dealer repair orders documenting the recall service and both engine replacements and can provide them upon request. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)Read more
Incident date: Aug 28, 2026
Driving on the highway lost proportion/acceleration, loud knocking coming from the engine
Incident date: Jan 1, 2026
The lifters stuck and it ruined the cam shaft. This was repaired and then when driving home, the engine seized and started smoking. The engine was then diagnosed with complete failure and it had to be replaced. The engine had been upgraded a year or two earlier to the 0W-40.
Incident date: Mar 27, 2026
Truck went into limo mode while driving and required valve in transmission to be replaced. Went from driving normal speed to only being able to go about 15 miles and hour. Was repaired got the truck back and the next day was on the interstate in the fast lane and the truck again had speed issue reduced speed and had to coast off interstate. This time entire valve body had to be replaced. Have gott
... en truck back and still have hard shifting in the transmission at times. Engine was checked for recall and now I have to pay a much higher oil change price due to a GM issue. This was not a known cost when purchasing this truck.Read more
Incident date: Mar 27, 2026
Truck went into limo mode while driving and required valve in transmission to be replaced. Went from driving normal speed to only being able to go about 15 miles and hour. Was repaired got the truck back and the next day was on the interstate in the fast lane and the truck again had speed issue reduced speed and had to coast off interstate. This time entire valve body had to be replaced. Have gott
... en truck back and still have hard shifting in the transmission at times. Engine was checked for recall and now I have to pay a much higher oil change price due to a GM issue. This was not a known cost when purchasing this truck.Read more
Incident date: May 15, 2026
Complete engine failure, recall was performed before engine failed on highway with family inside.
Incident date: Mar 17, 2026
Hello, I own a 2024 GMC Yukon Denali with the 6.2L V8. Car currently has 35,000 miles on it. At about 30,000 miles we started to feel a very aggressive vibration in the passanger seat, as well as the 2nd row seats, and driver seat. We took the vehicle in for the recall on the engine where we were instructed to put 0W-40 oil in. Much higher vescocity. After we did this recall the vehicle has not
... stopped shaking. We went for another service visit in July where we were told " this is the engine pistons trying to conserve fuel, and are firing causing the vibration." I have worked in the auto industry for 12 years, this is not a normal vibration. This should also not be caused by an engine. We then took it in again where they then proceeded to replace fuel manifold on August 18th. The vehicle shakes a bit less but still has a aggressive shake to it. I do not believe this is normal and if it is the engine pistons firing or the crank shafts misfiring, this could cause the engine to have catistrophic failure. This shake happens at speeds anywhere from 18 MPH to 50 MPH. My concern is with my wife and kids in this vehicle as the daily driver and this engine fails.Read more
Incident date: Aug 14, 2026
Driving down the interstate and lost all power, it said start engine and didn’t start coasted to the side of the road. It sounded like locked up engine, confirmed at dealership locked up engine.
Incident date: Aug 26, 2026
Confirmed as catastrophic engine failure by dealership. New engine has been ordered.
Incident date: Jul 30, 2026
Driving about 75 mph car shuttered and motor quit running had to pull off of the highway and get towed to dealership. Motor had to be replaced due to 1,2,6,7 rod bearings spun on the crankshaft. 34367 miles
Incident date: Jun 30, 2026
At approximately 58,565 miles, my 2023 GMC Yukon Denali equipped with the 6.2L L87 V8 experienced an internal engine failure. The vehicle had previously completed the applicable L87 engine recall remedy earlier in 2026. The vehicle developed a thumping noise and was inspected by an authorized GMC dealership. The dealer confirmed metal contamination in the engine oil and diagnosed a main thrust be
... aring failure. The condition was confirmed by the dealer and required complete engine replacement rather than a minor repair. The vehicle was out of service for approximately 31 days while the engine replacement was completed. GM authorized and covered installation of a complete factory replacement engine. The failed engine is available for inspection if requested. The failure created a significant safety concern because an internal engine failure of this type can result in loss of motive power while driving, potentially creating a hazard for the occupants and other motorists. I am aware that NHTSA is currently investigating L87 engine failures occurring after recall remedies. I am submitting this complaint because my vehicle experienced a documented internal engine failure after the vehicle had already received the applicable recall remedy and subsequently required a complete engine replacement. The replacement engine has not currently failed, and I am not reporting a failure of the replacement engine. However, I am concerned about the effectiveness of the remedy and whether the replacement engine incorporates updated or revised components intended to address the underlying failure condition. I have requested documentation from the dealership regarding the exact replacement engine assembly and whether it incorporates engineering or production changes related to the original bearing failure. That information has not yet been provided. No crash or injury occurred as a result of this failure.Read more