The engine needs replaced and GM doesn't have any engines or know when we will get any engines. Evidently this affects numerous 6.2 liter engines that GM made from 2021-2024.
2021 GMC Yukon engine complaints
Page 7 of 9: complaints 161 to 190 of 221, newest first, as owners wrote them.
Engine, just froze while driving.
Crank shaft has failed.
I was driving my Yukon with my family back from a trip and my Yukon engine shut off while on the highway. The vehicle went into neutral but I was driving down a hill when is all happened. Luckily there wasn’t much traffic and I was able to pull of to the side of the road. There was no check engine light or indication of any issues prior to this incident happening. After this incident, the vehicle turned back on and was able to drive home. Now it is seating at a dealership waiting for a new engine with no eta on a new engine.
Vehicle has an engine knocking. The oil pressure will drop and will go into low power
I've taken my 2021 Yukon Denali to GMC dealers complaining of "clacking" noise coming from the passenger side of the engine on 3 occasions. Each time, they tell me that they do not hear anything. Now, I see that the L87 engine has defective bearings which could lead to abrupt engine failure which could lead to a dangerous situation. I envision power sliding on the highway going 70 mph and ultimately rolling over and getting killed. I am now frightened to travel on the highway and see no resolution forthcoming from GM. They are just looking at $. My wife and I are [XXX] and travel to Florida from Wisconsin every year for winter. The Yukon to me was the most expensive, ni est vehicle that I have ever owned, but now feel like I could die anytime while driving it. Who would want to buy it now with this cloud over it, all hinging on how GM handles this mess. I've only owned GM products my whole life, but would never buy another now. Lost faith, and hopefully won't die waiting for GM to do something. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
I was driving down the interstate traveling 75 mph and with any warning the vehicle shifted into neutral. I made my way to the side of the interstate with any ability to accelerate on a busy stretch of highway. I had my children in the car with me. After making my way off the road, I shifted car to park and it wouldn’t go back into drive. I turned the car off, in an effort to put the car back into drive. The car wouldn’t not restart. We were stranded in the side of the interstate 6 hours from home. I had the vehicle towed to Ed Morse GMC in Rolla, MO. The let me know after a few days that my vehicle needed a new engine and that this has been an issue with other 2021 GMC Tahoe vehicles. We decided to have the vehicle towed to Bob Howard GMC in our town, Edmond, OK, and they confirmed a new engine was needed. In all we had to replace the engine, radiator, cooler lines and fuse array. There were zero messages or warnings leading up to this event. This was very u expected, scary and u safe for not just my family in my vehicle, but all the vehicles around my that day on the interstate.
The vehicle was handed off to the dealer for a routine oil change and transmission flush. The dealer stated over the phone that during the engine's oil draining process, the tech noticed metal particulates in the oil. The oil was allowed to completely drain until no drips fell from the drain plug. The tech then filled the engine with new oil to the correct level. After the trans flush was complete, the tech took the vehicle for a test drive, during which they noticed strange engine noises. The tech then parked the vehicle in the garage bay, where the engine subsequently failed. What component or system failed or malfunctioned, and is it available for inspection upon request?: The dealer has not confirmed the exact cause of the failure, however it is expected to be because of a failed connecting rod bearing. the federal safety agency may contact the dealership for information regarding an inspection. The dealer is Koons Chevrolet Buick GMC in Clarksville, MD 21029. How was your safety or the safety of others put at risk?: UNKNOWN, vehicle was parked at the time of failure Has the problem been reproduced or confirmed by a dealer or independent service center? : UNKNOWN, There are many forums online in which people have stated similar issues. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others?: UNKNOWN Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear?: UNKNOWN
Engin failure
I was passing a semi truck at 80 mph on the highway, after passing I tried to reduce my speed on the cruise control but got no response from my vehicle. I pulled off the highway and the engine was dead. I feel lucky to be alive the truckers were whizzing by at 80mph while we waited for a tow truck. The dealer has confirmed the engine is seized. There were no warning lights or other symptoms.
I was driving my vehicle at a speed of around 50 MPH when the vehicle had an sudden loss of power. The vehicle displayed press the start button while the vehicle was still moving with the motor off. I pressed the start button and the vehicle shifted to park and went to complete loss of power functions. The hazard lights would not work, the vehicle would not start or move out of park. The vehicle was stuck in the fast lane in park with no way of moving it or warning others with hazard lights. My daughter and I almost got hit by a semi due to the vehicle issues. I had to call 911 to get police there for safety concerns and a tow truck to take the vehicle back to the dealership. The tow truck couldn't get the vehicle out of park as well, so he had to drag my vehicle onto the tow truck. I have a 2021 Yukon Denali with the 6.2 engine. The dealership told me I need a new engine because of a known failure with the engine. They can't promise me replacing the engine will fix the issue. The vehicle has less then 60,000 miles on it. This engine issue put my life and my daughters life in danger. I had to carry my daughter across the highway because it was unsafe to stay in the vehicle. I can only imagine what could of happened if we were traveling at higher speeds with no way to exit the vehicle. The dealership told me it is going to be 3 to 4 months before I get my vehicle back and they can't promise the new engine won't do the same thing. This is a huge safety concern that GMC needs to address. I am stuck paying for a vehicle that puts my family in danger. Something needs to be done immediately. The dealership told me they have several Yukons in the shop with the same issue waiting for an engine replacement.
I started the 2021 Yukon Denali this morning and there was a slight squeaking noise coming from the front of the car. I began driving and the noise went away. I parked the car and completed an errand. I then started the car to return home and on the way it started making the noise but much louder. I pulled over and the car died and refused to start. GMC Roadside Assistance sent two different tow truck that were not able to tow the car. Tow Truck #1 - Flatbed truck. Car did not go in to neutral because it couldn't start so the driver said that he was unable to pull it up onto the flatbed. Tow Truck #2 - Tow truck w/ Dolly wheels. Driver said it was too heavy for his Dolly to tow the Denali. GMC Roadside Assistance then said that they're two trucks were unable to pickup the Denali and that I was on my own to call and get a tow truck and they would reimburse me. I am on the side of the road all morning not knowing what tow truck company nor what type of tow truck to ask for...... Denali still does not start and am now awaiting a local tow company to make the pickup. GMC Roadside Assistance was a total failure.
One bank of lifters went out while under warranty and were repaired then the other ones went out shortly there after.
Was driving normal down interstate. Interstate has two barrie walls making it a two lane road with no shoulders. Car was almost rear ended 3 times while it was stopped in middle of interstate. Me, my husband, my [XXX] , [XXX] and [XXX] were all in the car. I had to jump out the car while it was still rolling to make sure my children made it to safety before someone didn’t see us and hit us at 70mph. We had to cross the road and jump over a barrier in the construction zone. It took our high way patrol 35 mins just to show up and shut the road down to get the vehicle moved. According to the GM mechanic, a rod went through the block causing a hole. There was no warning of this happening, the car made noise and the vehicle automatically said low oil pressure, shut vehicle off, then an instant pop and smoked everywhere. The motor is on back order and won’t be able to be replaced for over 6 months if that. We had just purchased the vehicle and the motor was blown not even 3 hours after owning it. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The valves, the pistons had to be replaced. The motor went out. The motor should be replaced but they did not give me that option. The vehicle only has 50K on it. Was kept in the garage. Had regular maintenance. The GM service garage has had this vehicle since 2-11-25.
Had unexpected loss of engine power, rough idle and warning lights. Has been out of service in the GMC dealer for almost 6 weeks to date. No diagnosis. No repair date. No response from GM other than "waiting on diagnosis" No loaner or rental provided. Still under warranty. 6.2 v8. Engine failure suspected. I am reporting this to help switch the investigation to an actual recall of the wide-spread issue with this engine. No documentation written information provided by GM.
Engine locked up, local gmc dealer diagnosis " engine is locked up - metal debris in oil - failed internal components". Engine made a few noises the week before, no other warning signs. Vehicle died in the turning lane of a two lane road. One hour not moving in busy traffic until tow truck arrived
The contact owns a 2021 GMC Yukon. The contact stated that while his wife was driving at an undisclosed speed, the vehicle lost automotive power. The Electronic Stability Control warning light was intermittently illuminated. The vehicle was towed to a local independent mechanic where it was diagnosed with a spun rod bearing failure; however, further investigation was needed. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 102,000.
The component that failed was the Camshaft and Lifters in the Engine - My safety and others was put at risk because while going 45mph, I suddenly lost forward moving power and couldn't go faster than 35 - braking power was sketchy and only responsive when pumped. - I received the following errors on my dash "Service ESC" "Service Traction Control", Reduced Acceleration Drive with Care", "Forward Collision System Unavailable", "Service Emission System" the vehicle would shudder violently- this problem has been confirmed and corrected at a huge expense (see bill) -
The contact owns a 2021 GMC Yukon. The contact stated that upon his wife attempting to start the vehicle, the vehicle failed to start as intended. The contact's wife stated that she had previously heard an abnormal rattling sound coming from the engine compartment in the days prior to the failure. No warning lights were illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the oil pump, resulting in damages to the engine. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The contact stated that there had been a partial engine rebuild performed on the vehicle several months prior to the failure. The manufacturer was not notified of the failure. The failure mileage was 140,000.
What component or system failed or malfunctioned, and is it available for inspection upon request? - Engine Failure, on November 8, not certain engine is available for inspection -2nd Engine Failure, February 27, engine being replaced now and can be inspected How was your safety or the safety of others put at risk? -first engine failure happened on highway interchange without warning and stranded the vehicle on a busy highway with 6 passengers (5 of them children) at risk -second engine failed in the middle of an unprotected intersection, and would have caused an accident if other drivers were unable to brake Has the problem been reproduced or confirmed by a dealer or independent service center? -both engines discovered metal debris in the oil pan Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? -yes, vehicle was inspected by GMC dealership both times Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? -no warning lamps appeared, a message was displayed to restart engine as the engine was shut down while in Drive.
at 60860 my first engine went out General Motors offered no help i have extended warranty it took 3 months to get my Yukon back now 40000 later 2nd engine goes out cannot get a dealer to touch excuse after excuse tried to contact General Motors nobody will talk to me
Engine or something is making a noise every time turned on and now while turning off
Motor blew up
Hello, I am writing this complaint because i bought this 2021 GMC Yukon new from King GMC in Loveland CO. The engine seized up on me while driving once turned off, i was able to get it going and now it has done it again but this time no luck getting it going, Maintenace has always been maintained and up kept, and the more i read about this i am finding out its a problem that everyone is getting with this 6.2 litter engines. The dealer wants to charge me 30k to change the engine and radiator and cooler lines on an already ridiculous overpriced vehicle. I am not sure why there hasn't been a recall issued perhaps because it involves a new engine? over700k people have the same problem. if thier is something you guys can do i dont think its correct the customers have to pay the dues on an unsafe bad design engine. Thank you for your time
All lifters had to be replaced at 5,315 miles on 7/28/21 #7 Piston had to be replaced at 42,431 miles on 5/24/24 This vehicle has the 6.2 L V8 L87 engine that is part of the federal safety agency Investigation # PE25001 I am reaching the 5yr/50,000 mile drivetrain warranty and am concerned that this engine could have recurring problems.
Engine locked up while driving and left me stranded in the cold for hours
In September 2023, mere months after purchasing this vehicle, I was driving on the Mountain Parkway in Eastern Kentucky. Traveling the 70 mile hour speed limit, everything in the vehicle shut down, including my ability to use my breaks. Luckily, I was able to safely coast to the side of the road, which left me quite vulnerable as patrons passed at 70+ miles per hour. There were no advanced warning such as lamps, messages, or other symptoms of a problem. I had the vehicle towed to Hutch Chevrolet in Paintsville, KY where they indicated to me that the crankshaft locked up due to a crank bearing failure. They had to replace the engine and I was out of pocket $12,631.79.
Had to replace an engine due to a main bearing failure, not the connecting rod failure thats being investigated. We pulled into the driveway with zero issue and zero suspect of issue, changed the oil as routine 5k miles, went to start it, and it blew the 400A starter fuse. It friction welded the crank to the bearing when I ahit the engine off. It looked like it flaked the coating off the bearing, then due to the recommended 0-20 thin oil, it didn't have the proper protection for metal on metal. Hoping that the main bearings get added to this investigation, because they are the same coating. Same manufacturer.
The contact owns a 2021 GMC Yukon. The contact stated that while driving at 60 MPH, the vehicle's engine shut off without warning. The contact was unable to start the vehicle and was left stranded on the roadway for hours. The contact finally managed to have the vehicle towed to a dealer where they diagnosed the vehicle with a defective engine main bearing(engine failure). The vehicle remained in the dealer's possession where it had yet to be repaired. The manufacturer was notified of the failure but offered no assistance. The failure mileage was 28,450.
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