The contact owns a 2021 GMC Yukon XL. The contact stated while his wife was driving 25 MPH and depressing the accelerator pedal, the vehicle failed to respond. The contact pulled over to the side of a parking lot waiting for towing assistance. A dealer was contacted. The vehicle was towed to a dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired. The contact related the failure to the federal safety agency Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, the VIN was not included in the recall. The manufacturer was notified of the failure but offered no assistance. The contact was referred to the federal safety agency Hotline for assistance. The failure mileage was 60,000.
2021 GMC Yukon XL engine complaints
Page 5 of 7: complaints 101 to 130 of 166, newest first, as owners wrote them.
Check engine light on, Abnormal engine noise and very significant loss of power. Info registered in the repair invoice: tech verify customer concern, check for code found code p0300 and looking to the live data found miss fire on cylinder number 6, tech swap the coil and spark plug with wire, miss fire still on the same cylinder, tech inspect the injector no problem found, remove the valve cover for inspection found, that the rocker arms is loose, customer approve tear down, tech remove the head on the right side to inspect the lifter and the camshaft, tech found damage on the camshaft, camshaft replacement and lifter is necessary, customer decline repair, tech assemble the engine back and returned to the customer. Customer decide to replace the engine, tech replace the engine test to verify repair vehicle working as design
I am writing to formally file a complaint regarding a serious issue with my 2021 GMC Yukon XL, equipped with the 6.2L V8 gasoline engine and covered under Recall N252494000. The vehicle is experiencing significant power loss while driving, and the engine is making a loud clattering noise, which raises serious concerns about the vehicle’s safety, performance, and long-term durability. These symptoms are ongoing and have severely affected the drivability of the vehicle. Despite these clear issues, the vehicle recently passed a dealership inspection. In an effort to improve performance, a higher viscosity oil change was performed and a new oil cap installed. Unfortunately, these measures have not resolved the problem. The vehicle continues to run poorly and does not perform as expected from a vehicle of this age and mileage. I respectfully request the following: A thorough re-evaluation of the vehicle in relation to Recall N252494000. Immediate corrective action, including repair or replacement of any defective engine components. A detailed explanation of how the vehicle could have passed inspection with such evident performance and mechanical issues. Reimbursement for any out-of-pocket expenses incurred due to this ongoing problem.
I am writing to formally file a complaint regarding a serious issue with my 2021 GMC Yukon XL, which is equipped with the 6.2L V8 gasoline engine and falls under Recall N252494000. The vehicle is losing power during operation and the engine is producing a loud clattering noise, raising major concerns about its safety, drivability, and long-term reliability. Despite these issues being clearly present, the vehicle recently passed an inspection, which raises questions about the adequacy of the diagnostic and repair procedures related to this recall. This situation is both frustrating and alarming. I am concerned that either the inspection was insufficient or the recall-related defect has not been properly identified or addressed. I respectfully request the following: A thorough re-inspection and diagnosis of the engine under the scope of Recall N252494000. Immediate repairs or replacement of defective parts at no cost. A clear explanation of why the vehicle passed inspection despite these evident issues. Reimbursement for any costs incurred if the recall defect caused further engine damage.
While my [XXX] son was driving my 2021 GMC Yukon Denali XL, the engine failed suddenly without warning. The vehicle lost power completely and became inoperable, leaving them stranded far from home. This posed a significant safety risk to my family, especially given the location and time of day. There were no warning lights or messages prior to the failure. The vehicle was towed to a GMC-certified dealership, where the issue was diagnosed as a complete engine failure. The dealer confirmed that internal engine components were damaged and the entire engine required replacement. The dealership performed the repair and confirmed that the issue was consistent with known defects now acknowledged by GM in their 2025 recall affecting vehicles with the 6.2L V8 engine. The problem has been reproduced and confirmed by the dealership. The defective engine is no longer available for inspection, as it was removed and replaced during service. The repair was performed at my personal expense prior to the recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The contact owns a 2021 GMC Yukon XL. The contact stated while driving approximately 45–50 MPH, the engine was making an abnormal sound. The contact stopped and lightly depressed the accelerator pedal and continued driving. The contact stated that the transmission failed to shift gear. The RPM increased to high. The check engine warning light was illuminated. The vehicle was taken to the local dealer where it was diagnosed and determined that the transmission needed to be replaced. The vehicle was repaired under warranty, but the failure recurred. The vehicle was taken back to the same dealer who determined that the failure was related to the transmission. The vehicle was repaired but the failure persisted. The vehicle was taken to another local dealer, Hennessy GMC (145 Industrial Blvd, McDonough, GA 30253); where it was diagnosed and the contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 66,000.
The contact owns a 2021 GMC Yukon XL. The contact stated that while driving at various speeds, there was grey smoke coming from the exhaust pipes. The check engine warning light was illuminated. The vehicle was taken to a local dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired. The vehicle was taken to a local independent mechanic for a second opinion, and it was diagnosed and determined that the engine and brake pads needed to be replaced. The vehicle was not repaired. Upon further investigation, the contact related the failure to an unstated recall; however, the VIN was not included. The manufacturer was made aware of the failure. The failure mileage was approximately 125,000.
Vehicle has almost 75000 miles. No warnings whatsoever, the GMC app actually reported the vehicle has no issues and all systems are working. The engine began to knock, the transmission was not shifting well, traction control stopped working. Took the vehicle to the local dealership who called me and said it was complete engine failure that is going to require a brand new engine. All of the maintenance is up to date.
Subject: Formal Complaint – Engine Failure in 2021 GMC Yukon Denali XL VIN: [XXX] Defect Number (GM): [XXX] GM Case Numbers: [XXX] / [XXX] / [XXX] Office of Defects Investigation, I am writing to formally report a critical mechanical failure in my 2021 GMC Yukon Denali XL, which resulted in a complete engine failure, rendering the vehicle inoperable and exposing my family to significant safety and financial risks. Despite following the recommended maintenance schedule and driving under normal conditions, the engine failed prematurely. The vehicle has been out of service for over four months, and I have yet to receive a definitive resolution or timeline from General Motors. I have incurred over $13,000 in out-of-pocket costs, including towing, repair estimates, rental vehicles, and continued loan payments on a non-functional vehicle. Key Details: Vehicle: 2021 GMC Yukon Denali XL VIN: [XXX] Failure Type: Total engine failure requiring full rebuild or replacement Time Out of Service: 4+ months and ongoing Financial Impact: $13,335.58 in documented costs GM Defect Number: [XXX] (noted internally by GM) Dealer(s) Involved: Midas Auto Service, Beaman GMC (Nashville, TN) I have made repeated efforts to escalate this through GM’s Case Advisors and Executive Team, but have received no meaningful resolution or written acknowledgment of my request for either reimbursement or a good faith vehicle buyback. Given the safety implications of such a catastrophic failure in a relatively new vehicle, I believe this may represent a broader manufacturing defect or quality control issue and warrants the federal safety agency investigation. I respectfully request that the federal safety agency: Log this complaint into your safety database Investigate whether similar failures have occurred in other 2021 Yukon Denali XL vehicles Contact GM for further information regarding this defect and associated safety risk Thank you for your attention to this matter. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The contact owns a 2021 GMC Yukon XL. The contact stated that when the vehicle was started, there was a loud sound coming from the engine compartment. The contact stated that when the vehicle was driven around the block, the sound was still present coming from the engine compartment. The vehicle was taken to an independent mechanic where an oil change was performed but the failure persisted. The vehicle was then taken to the residence. The vehicle was next taken to a dealer where it was diagnosed, and metal shavings were found in the oil, possibly coming from the crank bearing or connecting rod bearing. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 100,371.
Loss of propulsion, engine over consuming oil per dealership inspection.
In March 2025, a situation happened to me during a six hour round trip drive. I experienced a loss of acceleration. Vehicle engine felt it was stumbling when accelerating or seemed like I had ran something over. I don't remember seeing any lights coming on. Pulled over immediately, turned off the vehicle. Turned it back on and drove back home three hours worried it may happen again. I didnt see any warning lights on the trip.
The contact owns a 2021 GMC Yukon XL. The contact stated while her husband was driving at an undisclosed speed, the engine made an abnormal loud sound, and the vehicle became undrivable. The vehicle was taken to Midas, where an unknown repair was performed. Additionally, the contact stated while driving 50-55 MPH on the expressway, the vehicle shuddered significantly, and the engine made an abnormal loud knocking sound. Unknown warning lights were illuminated. The contact was able to exit the expressway and drove back to Midas, where the contact was informed that the engine needed to be replaced, and the mechanic provided an estimated fee for the repair. The vehicle was towed to the dealer, where it was diagnosed that the engine needed to be replaced; however, the part was not available. The vehicle remained at the dealer for approximately three months. The vehicle was not repaired. The contact related the failure to the federal safety agency Action Number: PE25001(Engine, Engine and Engine and Cooling). The manufacturer was notified of the failure and informed that the part was not available. The failure mileage was approximately 73,000.
Noticeable ticking from the motor, loss of power while driving and smoking. Took to dealership to for repairs. Lifters replaced on one side, within 30 miles after leaving dealership vehicle lost power and would not crank. Per dealership same issue with spun bearing and crankshaft. New lifters and crankshaft placed. While driving 3 weeks later vehicle shifted into neutral and lost power and hand to coast to side of the road. Replace battery and still would not crank, had to be jumped off and able to drive home. 3 codes were retrieved from reader.
The engine failed while driving. Dealership reviewed the issue and a new engine had to be installed to replace the defective motor. It failed due to a camshaft/lifter failure. After talking with the dealership, this appears to be a common failure in the 6.2L motors. It resulted in a bill in excess of $12,000 to repair. Similar to recall N252494000, the 6.2L motor has defective components causing premature failure that should be recalled.
The contact owns a 2021 GMC Yukon. The contact stated that upon starting the vehicle, the engine oil light was illuminated. The vehicle was taken to a local dealer where the vehicle was diagnosed and the contact was advised that the engine was consuming an excessive amount of oil; however, the contact was informed that there was no repair available because the oil consumption had not met the requirements for a repair. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 58,000.
My vehicle is equipped with a 6.2L L87 engine. I have taken this to the gmc dealership in complaint of non consistent power of the engine and a vibration of the engine. The dealership believes it was the brakes and they were replaced along with the rotors. The problem still persists I feel after reading the stories of how other engines have failed that are L87, this is a similar problem but not covered under the recent recall.
I am the owner of a 2021 GMC Yukon Denali with the 6.2L V8 engine (VIN: [XXX] ). This vehicle has exhibited multiple serious issues affecting safety, drivability, and reliability. 1. Engine Noise & Oil Consumption: Since purchase, the vehicle has had a persistent loud knocking/tapping sound, especially under acceleration. The engine also consumes an excessive amount of oil between scheduled oil changes, with no visible leaks. I reported this to the dealership multiple times, but since there is no active recall or TSB, they refused to diagnose or repair the issue under warranty. I have since learned that many other 2021 Yukon Denali owners with the same 6.2L engine are experiencing similar issues and some have had repairs or engine replacements covered by GM. I have received no such support. 2. Braking Problems: The vehicle has ongoing brake performance issues. Despite replacing the brake components multiple times, the brakes feel inconsistent and unsafe, especially during highway driving or sudden stops. There is vibration and uneven response, and the braking system does not inspire confidence. These problems have persisted despite attempts to correct them. 3. Suspension/Handling Concerns: The suspension feels unstable and loose, especially at highway speeds or when turning. The ride quality is poor, and there is noticeable sway and body roll, which creates discomfort and concern for vehicle control. 4. Fuel/Propulsion System: The engine does not always respond smoothly to throttle input. I’ve noticed occasional hesitation or surging, which may be related to the previously mentioned oil consumption or fuel delivery. Again, the dealership has been unable or unwilling to resolve these issues without charging diagnostic fees. I’ve reported these issues to my local GMC dealer on multiple occasions, but no lasting solution has been provided, and I have not been able to afford expensive diagnostic costs out of pocket—especially for a vehicle of this price INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATIO
This vehicle is not included in the L87 engine recall, yet I have lifter noise and excessive oil consumption. They might have the dates and lots wrong.
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
The contact owns a 2021 GMC Yukon XL. The contact stated while driving 80 MPH, the engine was running unusually rough, and there were several unknown warning lights illuminated. The vehicle was taken to an independent mechanic and was diagnosed with a fractured valve push down lifter. The contact was informed that the valve push down lifter needed to be replaced. The vehicle was not repaired. The contact was advised to take the vehicle to the dealer for assistance. The vehicle was towed to the dealer where it was diagnosed with a fractured valve push down lifter and a failed cam shaft. The contact was informed that the valve push down lifter and the cam shaft needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure but provided no assistance. The contact referenced an unknown recall repair, which had a similar failure description, however the VIN was not associated with the recall. The contact was advised to contact the federal safety agency Hotline to report the failure. The failure mileage was approximately 109,000.
The contact owns a 2021 GMC Yukon XL. The contact stated while driving at an undisclosed speed, the vehicle inadvertently lost motive power, prompting the contact to discontinue driving the vehicle. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed failures with the lifters and camshaft, resulting in damages to the engine. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. After investigating the failure, the contact related the failure to the federal safety agency Campaign Number: 25V274000 (Engine and Engine Cooling); but the VIN was not included. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 100,000.
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
The lifters in the engine are failing
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.
Engine failed while driving on interstate. Vehicle could not be put in neutral because engine has to be running to shift. Difficult to tow. 4 hours away from home. Took to nearest dealer. Hit by hail storm sitting on dealer lot with $8000 hail damage. Still making payments and have no vehicle to drive.
The contact owns a 2021 GMC Yukon XL. The contact stated while starting the vehicle, the engine made an abnormal sound. Additionally, the low engine oil warning light was illuminated while driving. The vehicle was taken to the dealer, who diagnosed that the lifters and camshafts needed to be replaced. The vehicle was not repaired. The contact related the failure to the federal safety agency Campaign Number: 25V274000 (Engine and Engine Cooling); and the VIN was included in the recall; however, the contact had not yet received a notification. The manufacturer was not made aware of the failure. The failure mileage was approximately 24,000. VIN tool confirms parts not available.
We were driving on the interstate and the car completely shut off. It went to the 'restart engine' screen. My husband put it in neutral and tried to coast off the interstate almost getting hit by cars going 70+ mph. Cars were swerving not to hit us as we coasted across three lanes. One car almost hit another car because they quickly tried to go around us because of our decreasing speed and made that car swerve into the other lane. We ended up only inches off the right lane. We had 2 teenagers and our 1 year old baby in the car with us in the Florida heat. Sitting in that car was truly traumatizing because every semi that passed us, the whole car was shaking because we were so close to the line. I just knew that someone was going to veer off inches and wipe us completely out. Because the engine just shut off, we barely made it off the road so cars were honking at us because they knew the danger we were in not being far enough off the shoulder. We all had to climb out the doors on the right because opening the left side doors would be in the right lane of the interstate. There we sat for 2 hours in 99 degree weather with a 1 year old (who also got bit by ants being in the high grassy area off the interstate) waiting for a tow truck to pick up the Yukon to tow it in to a location that isn't even where we live. We had to wait on someone to come pick us up that could hold 5 people and a car seat plus all of our sports equipment that we had for our tournament that weekend that we were headed home from. A nightmare, truly a nightmare. There was no warning, no lights came on, no heads up that the car was about to completely shut off going 75 mph. It just did, without warning. I was never informed about the POTENTIAL of a recall, or I would have been the first one at the door to get it checked out. My family was put in tremendous danger because of the irresponsibility of GMC. This is a nightmare, truly a nightmare.
I was driving on a highway at speeds of 65 mph and the engine stalled on the left lane. I almost got struck by a tracker trailer. The dealer supposedly fixed the issue and a few months went by and the vehicle died again engine failure in middle of the highway.
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.
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