The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving approximately 10 MPH, there was an engine misfire and then a knocking sound started coming from the engine. There were no warning lights illuminated. The contact had the vehicle towed to the dealer who stated that there might be a failure with the valve lifters; however, a diagnostic test had not been performed. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 40,000.

- Georgetown, KY, USA

"no start" issue. Intermittent no start increased in it's frequency until it wouldn't back in July 2021, it had approx. 9600 miles on it. Had it towed to dealership. They could not recreate problem. I raised hell, and started reading that others had similar problem. A TSB came out that advised tech to install.5 shim. That seemed to have worked until recently late May 2022, have appt. with dealership again. They didn't do a scan the next day to pull a code since one might have shown up at that point. Most likely nothing there now. truck has been driven an additional 10K miles since initial problem and now shows 21400 miles. I can't have this problem every 10K, since soon this will be coming out of my pocket. and it needs a fix as others are having the same problem. GM has had well over a year to sort this out so I'm hoping if it isn't the cam sensor it's something else fairly straight forward. Heading in for service again on 6/15/2022 for same complaint.

- Bedford, TX, USA

I was driving and noticed several loud clunking noises coming from the Engine bay. The truck began to cut out, shake, and misfire. My dash began to flash and state I had a parking brake failure. I had no choice but to be towed. I have just shy of 17,000 miles. The dealership stated I had two lifter and 1 rod failure. They replaced the rod and all lifters on one side of the engine. I took the truck home for one night and it broke down again. The dealership stated it was fixed for a second time. When I picked it up again, I made it 1 mile down the road before the truck had the exact same symptoms with shuddering and misfiring. It is at the dealership for a third time. I was surprised to fin several class action lawsuits now filed against gm concerning the lifter issue. YouTube is full of lifter issue videos. This should be fully investigated and obviously warrants a recall for lifters, rods, and the camshaft.

- Ochlocknee , GA, USA

On April 29, 2022 between 4:45 - 5:00 pm Eastern, I was dropping off my son at work when I suddenly experienced a variety of Truck Diagnostic Error messages on the front driver display window. In addition my OnStar advanced diagnostic alert system informed me with the following system issues: Engine and Transmission; StabiliTrak stability control; Antilock Brake; and Emissions. At that moment the truck experience a cut in power and slowed down with a knocking sound coming from what seemed under the truck. I slowly proceeded to drop off my son and drove back home and parked the truck. Truck was towed to local Chevy dealer on Friday of that day. A preliminary diagnosis was done Saturday, April 30 suggesting an Engine Lifter issue. On Monday, May 2, 2022, a final diagnosis determined engine lifter failure on one side of engine bank. Vehicle is still under Warranty with 17,400 miles on it.

- Homestead, FL, USA

GM USES/USED SUBSTANDARD ENGINE COMPONENTS i.e. LIFTERS. GM KNOWS THSES ARE PRONE TO FAIL, YET ONLY REPAIRS THE VEHICLES THAT ARE AT AN AUTHORIZED DEALER PRIOR TO SALE. ALL THE VEHICLES THAT WERE ALREADY SOLD WILL NOT BE REAPIRED UNLESS ITS BROUGHT IN FOR SEVICE, GM WILL NOT NOTIFY CUSTOMERS OF THIS ISSUE. ALSO GM FAILS TO STOCK THESE PARTS EVEN THOUGH BY THERE OWN SERVICE BULLETINS SUBSTANDARD PARTS WERE USED TO BUILD THESE VEHICLES. GM WILL NOT SUPPLY LOANER VEHICLES TO PATRONS WHO DO HAVE THIS SERVICE DONE NOR WILL THEY TELL CUSTOMERS THAT THE PATRON COULD RENT A VEHICLE AND GET REIMBURSED FOR SAID RENTAL.

- Bronxville, NY, USA

While driving East on I-24 with my granddaughter. I felt a thump much like hitting a big dog or something in the road. I looked at my 10 year old granddaughter, she was looking at me, she said what was that? I said I don't know, but it happened again in about 1/4 mile down the road. We traveled about another 1/4 mile when the truck started sounding like a machine gun being fired!! My granddaughter started crying as she was scared, I pulled over into the emergency pull off to check my truck. It was running good now and NO ENGINE LIGHT was on. So I continued driving toward Clarksville, TN. although I considered turning back and heading home. I thought maybe it was water in the gas or something. After arriving in Clarksville to pick up my two grandsons we started home. As soon as I got on I-24 west the truck started the same thing again. Felt like we hit a big dog and then started sounding like a machine gun being fired. This time the ENGINE LIGHT DID come on. I was afraid the truck was going to quit running and there I was with 3 grandkids on a very busy I-24!! I contacted Patroit Chevrolet where I purchased the truck at. They told me it would be 6 weeks before they could look at my truck!!!! I hung up but called back as I was afraid that I couldn't make it home, the truck was running bad!! They found that it had dropped a lifter, it had only about 6,300 miles on it!!! They had it for about 3 weeks. Now, I find out that GM has had a lot of problems with these motors, "A LOT of PROBLEMS"!! I, m sure the problem WILL happen again, I am hoping no one gets killed when it does. THIS IS A DANGEROUS PROBLEM!!! GM needs to replace these motors or buy them back or something!!!

- Slaughters, KY, USA

I have a 2021 Silverado 6.2 being repaired for failed lifters. I see this is a common trend and can cause hazards when pulling over for a faulty motor. 10 speed Transmission downshifts from 2 to 1 harsh with rpms jumping up causing for me to apply more brake pressure to stop. I have had a few incidents when I get close to the vehicle in front coming to a stop. I have taken vehicle to dealer for issue and they couldn-??t replicate issues. Check engine light has popped up once or twice but never stayed on long enough to throw a code.

- San Antonio, TX, USA

Engine valve lifter failure at 20,000 miles; engine hesitation and power loss. Error to parking brake and to electronic stability control. Chevrolet to replace damaged lifter but refused to replace both banks of defective lifters. As a result of dysfunction I was stranded 1200 miles from home and have been waiting 2 weeks for repair. Still 1200 miles from home with 2 kayaks, 2 bikes etc.

- Corvallis, OR, USA

Engine lifter failure, excessive engine noise, loss of power and responsiveness, strange sounds from engine and runs very rough especially during acceleration. Multiple warning lights associated with the valve failure. Cruise control no longer works.

- Oviedo , FL, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving 55 MPH, she heard abnormal knocking sounds coming from the engine. The contact veered to the side of the road inspected the vehicle but found no issues. The contact continued driving for a while before the failure recurred and the sound was much louder. The check engine warning light illuminated. The vehicle was towed to a local dealer to be diagnosed. The contact was informed that two rods had gone through the engine block and the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 6,000.

- Kitty Hawk, NC, USA

At 7000miles truck had sudden engine failure, pulled to side of road and had towed. Dealership said it has a conmonly occuring failure of valve lifters causing bent pushrods.

- Eugene, OR, USA

Lifters in the engine failed causing the truck to sputter and shake going down the highway. Barely could hold it in the road. Truck wanted to stall out while driving. Truck was fixed and made it 30 miles before the same thing happened again. Chevrolet has dropped the ball and needs to be held accountable for this problem before someone gets hurt or killed.

- Verdunville, WV, USA

Driving down the road and out of know where engine starting knocking and lagging, idled rough. Drove to dealer lifter failure was what was diagnosed. 10000 miles on the truck driven easy, no towing or anything. Dealer also informed me 3 other silverados were there for the same problem! Ridiculous!!

- Fernandina Beach, FL, USA

Electric steering control and driver assist malfunctioning along with engine misfire Been to the dealership 3x they have reproduced the issue unable to repair Chevy also notified apparently many other vehicle of my same type have this issue Happens daily till vehicle has run for a bit Unsafe till then Started at about 13 k miles still ongoing

- Jupiter , FL, USA

My vehicle lost power to accelerate on an on ramp just before a bridge over the Wisconsin River and I was not able to merge into traffic. I was nearly put into the guardrail just before the bridge and I had to wait for the semis and other vehicles to pass and give me an opening. I drove straight to the closest GM dealership under reduced power. I was accelerating and would have been able to easily merge until suddenly my engine seemed to stall/lose power significantly. This caused me to slow down and not be able to get over as there were two semi trucks in the northbound lane of highway 39 in Kronenwetter WI. I have now found out that the power failure is due to something that is, according to my rough calculations happening very frequently to my model of truck for the years 2019, 2020 and 2021. I am curious to know how many trucks per year" One dealership told me they do about 2 trucks per week in Wausau and a dealership in Green Bay WI told me 3 per week. Rough math tells me that spanning 4500 certified GM service centers equals over 400000 vehicles per year. When does this become a safety recall if not a general recall to protect consumers? GM knows about this problem however they continue to put in the same faulty lifters in the vehicles and only fix/ put in upgraded lifters when they break. How can a car manufacturer put vehicles on the road and sell them knowing there is a potential no only to break but in instances like mine or others I can't even envision, cause an accident or worse"

- Mosinee, WI, USA

Approx every 1,500 miles engine will crank for ~25 seconds and not start. This creates two safety problems 1) Defective part in engine could cause metal shavings in engine or some other form of part failure resulting in seized engine along with fire or accident. 2) Vehicle has start stop feature. Failure of vehicle to start at an intersection could result in a traffic accident. Vehicle was serviced at Chevrolet dealer where they stated vehicle could not be repaired without demonstration of the problem. Dealer did not inform me about, inspect or make repairs for two service bulletins that I found on the internet for the issue. One service bulletin is for a defective engine part. The camshaft target wheel could be bent and contacting the timing chain. The other dealer service bulletin is for a software update to correct a similar starting issue. For review, I uploaded the dealer service report along with both dealer service bulletins. I'd really like NHTSA to look into why GM is not informing vehicle owners about the software issue or the known defective engine part.

- West Bloomfield Township, MI, USA

Too whom it May concern Our 2021 Chevrolet Silverado 1500 had check engine light come on 7/5/21 called Chevy Service department was told Bring vehicle in if Light flashes, Light went off Service department said if it happens again to bring it in. It happened again 10/12/21 took vehicle in to service was told it was something too do with lift & Technician reset something & Did our first Oil change as this was a New Truck bought in 01/13/21 from them. Well 10/25/21 My Wife & I were Driving when we heard a loud banging noise coming from Truck we Also lost Power & Truck was shaking Bad. Called Dealership asap was told bring in Now. Service department said Engine was basically shot that engine lifters went bad & Probably had a bent pushrod. So Basically a catastrophically engine failure on a Brand New 2021 Chevrolet Truck with 7000 miles. Had this Happened on the highway @ highway speeds with sudden lost of Power This could lead too an accident & possibly a loss of Life. The Sad part is this has been a ongoing issue with the 5.3 & 6.2 engines since 2018 & Chevrolet is aware of it. They have No Fix and are installing the same defective Parts back only too have same issues again & again. Spoke with Corprate & They have No answers or cares my Wife said she would never drive Truck again especially since admission from a Chevrolet service Tech said it will happen again. This has been Long enough Chevrolet must recall these Vehicles & Apparently its All GM engines 5.3 & 6.2 whats it gonna take someone being Seriously hurt or Killed!!!!

- Olmsted Falls, OH, USA

Turned on my 2021 Chevy Silverado in my driveway and esc service notification popped up and check engine light popped up as well and then a loud clicking sound came from under the hood which turns out to be a bad lifter.

- Tucson , AZ, USA

Engine began to shudder, vibrate and lose power on the highway. Multiple codes were eliminated - check engine, service park brake, service ESC, service emissions system. Loss of motive power is a safety issue. Vehicle currently at the dealer for service. I have been notified it is a lifter issue and major engine repair required. GM Authority and other online forums identify this as a known major field issue and continuing to grow.

- Metamora, MI, USA

while stopped, engine running, in gear, foot on brake the truck lurched forward approx 2-3 feet. when i tried to pull forward the engine was revving a much higher rpm's. moved down road approx. 1-2 miles, tried to turn around to return to a dealer near by and truck would not go into reverse...on-star reported to get engine/transmission service soon. reported to dealer, they checked the (code)? truck continued to run well....till it happened again....now it has happened a third time dealer has ordered parts to try to correct. dealer is trying, but no one seems to know what to do...

- Polson, MT, USA