I completed the N252494003 recall inspection on my 2021 Chevy Silverado 1500 6.2L at Carl Black Buick/Chevy/GMC in Roswell, GA. They said my crankshaft was not one of the vehicles affected and sent me on my way with my free oil change as a remedy to the issue. I subsequently used that information, thinking the -??bottom assembly-?? of my motor was good and not impaired, and proceeded to have the DOD/DFM deleted from the motor because it was a known fail point and this work cost me $7,000. Maybe 6 months after my inspection for the recall, I begin to hear a noise and I take it to the same dealership for service and they tell me the crankshaft is faulty. Nothing about the DOD/DFM delete and subsequent ECM tune had any impact on the crankshaft and yet, the dealership is denying fault when it was there service department hid the truth of the engine during the inspection. The warranty for the crankshaft is no longer applicable because of the modifications I did, but had they been honest about the faulty crankshaft, I would-??ve never done that work to it in the first place. The engine should-??ve been flagged during inspection and replaced.

- Marietta, GA, USA

For the second time in my 2021 Chevrolet Silverado with a 5.3-liter engine, I've had GM lifter failure. It's directly related to the Active Fuel Management System (AFM), and was confirmed by my Chevrolet dealer's mechanic and service writer, Burdick Chevrolet in Cicero, New York, on both occasions. They've had to perform a multi-thousand-dollar lifter replacement service job. They've told me that GM is aware of the safety issues, but won't do anything about them. It also happened to me with my 2014 Chevrolet Silverado, but I was lucky that time. It was fixed with new spark plugs and wires. It's cost me thousands of dollars for repairs each time. But that's not why I'm reporting this to NHTSA. The issue is safety. When the lifters fail, you get no warning. The truck rattles and rumbles. It becomes unstable on the road, and sometimes wobbles as if it's about to go out of control. The problem causes the loss of electronic stability control (ESC) and renders the electronic parking brake useless. Lifter failure can also cause the engine to stall while driving, especially at a stoplight. This happened to me. I had to press the gas pedal gently to keep the engine running at a stop light just to get off the road. On the highway, when the lifters fail, the truck slows to a point where it cannot keep up with traffic. That presents a dangerous situation. It's not safe. GM knows about it, but as far as I understand, the company has done nothing to fix the safety problem. Internet forums are full of comments about the problem, the safety issues, and the enormous cost of repairs. Surely your agency can compel GM to fix the lifter failure problem before someone suffers a major accident due to an uncontrollable vehicle. I'll never buy another vehicle with AFM. Many people are unaware of the dangers involved with this system. GM should get rid of it. [XXX] Skaneateles, [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Skaneateles, NY, USA

Truck is equipped with a 6.2 engine. It is a 2021 with less than 100k miles on it. Dealership is stating engine failed for no reason. Dealership confirmed engine failure this past week of April 2026. This is a known issue and my vehicle is not under the recall. Truck stalled out of no where. There was no warning before it did it.

- Midland, TX, USA

right bank collapsed lifter. this is the 3rd time in 5 years this has happened same side same lifter. loss of power engine shakes the whole truck. Also electronic emergency brake won't release automatically and engages when driving. This has happened when I first bought the truck in Mar 2021, again in nov 2024 and currently at antelope valley Chevrolet on Mar 20 2026 for the same thing.

- Rosamond, CA, USA

When taking off it will sometime have hard shifts, shuddering, and acceleration hesitation. While driving, it will do static jolts. Dealer couldn-??t pin point problem and advised for a new transmission or we could drive it until it dies. Dealer didn-??t recommend to change transmission oil in fear of creating more damage.

- Blue Springs, MO, USA

I am writing because I have a truck with the 6.2L L87 engine and it has been burning oil at every start up and acceleration from stop signs or stop lights, it blows out a blue cloud of smoke. I have asked Jeff Belzers in Lakeville, Mn to look and they did not as my vin did not show up in the recall. I took it to Maur Chevrolet in Inver grove heights, Mn and they told me that my miles were too high and they did not do an oil consumption test. I am burning 2 1/2-3 quarts of oil every 3,000 miles. I called the GM customer service line and they said there is nothing they can do except note it, so if I do get it repaired and pay for it, I could possibly get reimbursed in the future. If there is a known issue with this engine and there being 3 different engine builders, than why is it that my engine doesn't fall under that recall. It has all the symptoms of the engine failure that is specified in the recall? And it started about 6 months ago. Thank you Sincerely, [XXX] P.S. I have 136,000 miles and the special coverage warranty runs out at 10 years or 150,000 miles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Lakeville, MN, USA

The coolant control valve failed and the repair resulted in an engine oil leak which persisted for 8 weeks and still has not been repaired. The service manager at the dealership and General Motors Company are trying to figure out how to fix it but are not able to yet. They may have to replace the engine is one thing the service manager said to us this week.

- Franklin, NC, USA

Engine Temperature fluctuates. Check engine light comes on, prompt on dash will say engine is overheating. Engine fan stays on high. Code on scanner states Coolant Control Valve. GM has issued special coverage on this exact issue. However, they tell me my truck is not covered. I am very upset with GM as they are failing to address a known concern with my vehicle.

- Ava , IL, USA

On January 2, 2026, I brought my vehicle in for service to replace the upper and lower ball joints, as well as the control arms. I retrieved the vehicle from the repair shop on [XXX] and departed the same day for travel to Mississippi. Later that evening, while traveling southbound on [XXX] near Columbia, Tennessee, I stopped at [XXX]. Upon re-entering the highway and accelerating to merge into traffic, the vehicle began shifting through gears abnormally. While in approximately 6th gear at around 2,900 RPM, a loud banging noise occurred, followed immediately by a significant loss of engine power. At the same time, the check engine light illuminated. Due to the sudden and unexpected loss of power while actively merging into highway traffic, I was nearly rear-ended by another vehicle. I was forced to take immediate evasive action and pull onto the shoulder to avoid a collision. This incident created a highly dangerous situation not only for myself but for surrounding motorists. This lifter failure occurred without warning and directly impacted my ability to safely operate the vehicle in a high-speed traffic environment. I believe this presents a significant safety concern that warrants investigation. There have been over 600,000 recalls for this and Chevrolet's solution was an entire engine replacement. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- White House, TN, USA

I am filing this safety complaint regarding a documented engine wire harness chafing defect in my 2021 Chevrolet Silverado 1500 with the 2.7L L3B Turbo engine. While driving, my truck experienced erratic acceleration, engine throttling to 3,000 RPM without returning to idle after releasing the accelerator, engine misfires, sudden loss of engine power, stalling, and multiple simultaneous warning lights. These conditions created immediate safety and collision risks on public roads. GM issued TSB 21-NA-149 in June 2021 and a second bulletin September 17, 2021, both before my November 2021 purchase, identifying wire harness chafing in the L3B engine caused by a manufacturing error. A wire harness clip was removed during production creating an uncontrolled harness branch that contacts sharp edges on the ECM/TCM bracket, upper control arm, and shock tower during normal engine vibration. This defect was built into the vehicle at the factory and was never disclosed to me at point of sale. The defect manifested after warranty expiration causing cascading failures; wire harness, catalytic converter, and transmission, all within five weeks. Vehicle has been inoperable since January 8, 2026. Defect confirmed by independent mechanic and by Ancira-Winton Chevrolet (authorized GM dealer) in their own repair documentation referencing GM Bulletin 21-NA-149. Dealer documented catalytic converter failure as consequential damage from wire harness repair. GM created Customer Satisfaction Program N192219370 for this exact defect. My VIN was excluded despite experiencing identical symptoms. No safety recall has been issued. Loss of throttle control and stalling at highway speeds represents an imminent collision risk. I request NHTSA investigate a formal safety recall for 2019-2023 Silverado 1500 and Sierra 1500 vehicles equipped with the L3B engine.

- Elmendorf, TX, USA

The contact's father owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving approximately 70 MPH, the check engine warning light illuminated. The vehicle started losing automotive power. The contact pulled over and turned off and restarted the vehicle, but the check engine warning light remained illuminated, and while the vehicle was shifted to drive(D), the vehicle failed to accelerate above 40 MPH. The contact stated that the vehicle was taken to a dealer who diagnosed the vehicle and determined that the lifters and cam shaft had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 63,000.

- Ruidoso, NM, USA

COMPLETE ENGINE POWER LOSS. I WAS DRIVING MY TRUCK TO WORK. I PULLED OUT TO THE DOUBLE LANE HWY TO MAKE MY WAY TO WORK. AS I WAS EXCELERATING UP THE HILL THE ENGINE JUST STOPPED, FULL POWER LOSS. PRIOR TO THE POWER LOSS THERE WERE NO WARNING LIGHTS OR ALARMS. ENGINE LIGHT WAS NOT ON. LUCKILY IT WAS EARLY IN THE MORNING AND THE ROAD WAS NOT BUSY. I WAS ABLE TO COAST MY TRUCK TO THE SIDE OF THE ROAD AND LATER HAD IT PULLED TO THE SHOP. I WAS TOLD THE ENGINE FAILED. THERE WAS AN ENGINE ERROR CODE P0016. I WAS TOLD THE ENGINE WAS SHOT AND WOULD BE BETTER OFF REPLACING. i WS ALSO TOLD THIS WAS NOT COVERED UNDER THE CURRENT RECALL. THE ESTIMATE TO REPLACE IS $9500. MY TRUCK HAS 93, XXX MILES ON IT. iT IS CURRENTLY AT VOGELS CHEVROLET IN KIEL, WI 53042

- Kiel, WI, USA

On August 10th 2025 I was driving down the 5 freeway to the airports All of a sudden I notice my check engine light is on. It was Sunday Chevrolet is closed so I got off the exit to go to auto zone in XXX. I stop at a red light my engine shuts off. I tried to turn it back on twice and it starts to smoke where the battery is. I have it towed to Chevrolet Fairfield. Where they figure out my ground wire came loose and shorted out. I paid for that to get fixed upon returning to get my vehicle on August 31, 2025 I drive not even 10 miles down the road and I hear a boom and then really loud clanking. I blew my engine. It was diagnosed with the same problems as other 6.2 gm motors. I have it towed back to Fairfield Chevrolet. It sat in Fairfield for a couple months due to me working out of town for work and the manager from Fairfield Chevrolet started giving me problems harassing me saying that if I didn-??t get it off of his lot he was going to start charging me. So I had it towed from Chevrolet Fairfield to my house in [XXX] where it has sat since. I have been going back and forth with Chevy because I know of the recall however my vin is not in that recall yet it is the same problems as all the ones with the recall. I am really wanting to fix my vehicle as it has been almost 9 months. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

- Redding , CA, USA

Random catastrophic engine failure Randomly made a clunk noise and oil pressure dropped to 0. Engine needs replaced

- Jonesboro, AR, USA

My vehicle has been at the dealership since February 4 due to a transmission failure involving the valve body, which is currently on national back order along with the converter. These parts are required to complete the repair, and the vehicle is not drivable. This issue occurred after previous major repairs, including engine lifter replacement and a CV axle repair. It has now been 71 days without a repair. The dealer has confirmed the failures, but the manufacturer has not provided a repair timeline or a definitive solution. I have not received consistent updates since March 19, and the vehicle remains out of service with no estimated completion date..

- Jacksonville, FL, USA

On February 12th, the check engine light came on in my 2021 Chevy Silverado 1500 with the L87 6.2 L engine. The following morning, I took it to the shop and had it checked. It was diagnosed with crank shaft bearing coming apart. I contacted the dealership and they told me that my VIN was not associated with the L87 recall, but that they would see if GM would be willing to help with the costst associated with replacing the engine. They agreed to pay for about 30% of the repair. I pointed out to them that my engine was manufactured in the Tonowanda, NY plant which is the site where many of the recalled engines were manufactured. They still refuse to cover the cost of the new engine. I feel that they should cover my costs since the engine was manufactured in the plant and broke down for the exact reason for the recall. My costs are over $10,000 due to their defective engine. Please add my VIN to the recall.

- Sarasota, FL, USA

- What component or system failed or malfunctioned, and is it available for inspection upon request" High pressure fuel pump, lifter, and cam shaft failure. - How was your safety or the safety of others put at risk" Potential crash w/ kids in truck, loss of power, surging, engine damage, etc.. (fuel pump) Potential crash w/ kids in truck, engine seizure, severe engine damaged, metal fragments, loss of power, abrupt lock up, fire hazard, excessive noise, etc.. (lifter/cam shaft) - Has the problem been reproduced or confirmed by a dealer or independent service center" Yes confirmed by dealer Hiley Chevorlet, case # xxx w/ General Motors. - Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Yes by service dealer Hiley Chevorlet, case # xxx w/ General Motors. - Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear" No, no check engine light or messages. Bought the 21' silverado about 18 months ago, recently the truck began to sound and drive terrible, it was found to be a bad high pressure fuel pump, bad lifter, and damaged camshaft. Dealership acknowledged that these are common issues w/ this model & year of vehicle and the parts are defective parts that they use in the manufacturing process of this model. They deemed it was out of warranty range as it's still under year 5 however I exceeded the powertrain warranty by 10,000 miles so they will not cover the issues and damage.

- Royse City, TX, USA

GM 6.2L motor failure causing motor to have to be replaced. Not covered by GM's recall due to being VIN specific

- Howell, MI, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving at various speeds, the vehicle started shaking abnormally. The Service Electronic Stability Control (ESC) warning light, Parking Brake warning light, a wrench warning symbol, and the check engine warning light were illuminated. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was informed of the failure and confirmed that there was no recall associated with the VIN. The contact was referred to the NHTSA Hotline to report the failure. The failure mileage was approximately 125,000.

- Lakeland, FL, USA

2021 Silverado LTZ L87 6.2L V8 engine. 49753 mi. February 27th 2026 total loss of power when parking. A few weeks later hearing knocking noises coming from driver side engine area. this is my daily driver and need this issued fixed.

- Chandler, AZ, USA