Engine started to backfire/pop through the intake while driving. I had it towed to the dealership as it wasn't drive-able. They told me it was major engine failure, broken valve spring or bad lifter but won't be sure until the engine is torn down. I was driving on the interstate and the engine immediately started popping which slowed me down drastically. This was on an interstate road where there is a lot of traffic and it is higher speeds than regular roads. I was afraid of being hit from behind before I could pull of the road. The dealership confirmed it has major failure but have not inspected it yet. There was no symptoms/warnings or warning lights.

- Wimauma, FL, USA

While driving down the interstate about 450 miles into my trip, my engine started missing and knocking. I pulled off on the next exit, about 2 miles, to call for a tow. The repair from the dealership states: "CS: CUSTOMER STATES STARTED KNOCKING AND WOULD NOT ACCELERATE. Caused by verified customer complaint- heard loud ticking/knocking noise coming from the left bank- removed [left bank] valve cover and cranked engine and found the cylinder #3 intake rocker arm wasn't moving. Upon disassembly found the #3 exhaust push rod bend." The invoice shows the replaced the following: Installed 12680871 :SL-N-Lifter (00459-BPCKT) Qty: 8 Installed 12622325 :SL-N-GASKET (00289-CT) Qty: 1 Installed 12657093 :SL-N-GASKET (03270-CKT) Qty: 1 Installed 11611976 :SL-N-BOLT (00293-CKT) Qty: 1 Installed 11546959 :SL-N-BOLT (00293-CKT) Qty: 9 Installed 12664915 :SL-N-GUIDE (00439-CT) Qty: 2 Installed 12619787 :SL-N-GASKET (00423-CKT) Qty: 1 Installed 12619828 :SL-N-ROD (00426-CKT) Qty: 1 Installed 12346290 :N-COOLANT (08800-BOPCKT) Qty: 1 Installed 19419227 :SL-N-FILTER (01836-BOPCKT) Qty: 1 Installed 19352900 :N-OIL (08800-BOPCKT) Qty: 8 Installed 12679462 :SL-N-PIPE (03163-CT) Qty: 1 Installed 12677002 :SL-N-PIPE (03163-CT) Qty: 1 removed air intake- fuel lines- valve cover- exhaust manifold- cylinder head- lifter guides and lifters- replaced bank one lifters and carriers, and #3 exhaust push rod, reassembled in reverse order and test drove 30 miles. vehicle is operating as designed" Mileage in: 8008 Mileage out: 8035 The dealership had someone drive my truck back to me from Brewton, AL to Clinton, TN on 05/20/2021). I drove my truck to see how it felt. I immediately smelled antifreeze, but the temperature gauge read 210 which is normal. Upon accelerating up hill, I thought I felt a miss in the engine. When I arrived at the Clinton, TN dealership, the technician plugged in the code reader and it showed a misfire in the engine. I left the truck with them and they gave me a loaner.

- Clinton, TN, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving off from being stationary, the vehicle stalled without warning. There was no warning light illuminated. The vehicle was taken to smart Chevrolet Cadillac Buick GMC (3 smart dr, white hall, ar 71602, (870) 543-2200) but was not yet diagnosed. The vehicle was not repaired. The manufacturer was informed of the failure however, the contact was still awaiting a response. The failure mileage was approximately 300. The consumer stated the vehicle was repaired. A coil pack was replaced.

- Whitehall, AR, USA

----warning light flashing at 103 miles on vehicle, , dealer reset ----450 miles on vehicle stalling, ,warning lights ECM - engine systemp2635 the engine and transmission system is not performing as expected. An issue has been detected in the fuel management system used to maintain, control and monitor fuel consumption. If the check engine light is flashing, a misfire condition has been detected. A misfire increases vehicle emissions and could damage the emission control system on the vehicle. Please reduce vehicle speed, avoid hard accelerations, avoid steep uphill grades, and reduce any cargo loads such as a trailer. If the vehicle is continually driven with the check engine light on, the emission controls might not work as well, the vehicle fuel economy might not be as good, and the engine might not run as smoothly. This could lead to future repairs. Vehicle was towed to maltbie Chevy and has been there since Feb 24th

- Chateaugay, NY, USA

On Thursday Feb 18th is was snowing when I left work, drove around the beltway approximately 30 miles going on average 30-40 mph.no issues just bad roads. Right after I left the highway and turned on to a main road, I was approximately 1 mile on that road in the middle lane driving straight at about 25-30 mph when my new 2021 Silverado (5000 miles) loss power. The battery and check engine light came on with no engine power. As the vehicle was coasting attempted to get off the main road, but didn't make it due to the snow covered roads and slush. Ended up in a merge lane still in traffic and was almost hit numerous times. Tried to restart and get to a safe location, but when pushing the start button the Silverado would crank extremely long period of time and then final cutout. Was on the phone with on star where they put me in contact with the local police department who never showed and then left me a message they were coming out due to the inclement weather. Thanks. After talking with police dispatch on star setup a tow truck, but gave them the wrong address which was more than an hour away from my location. Once back on the phone on star stated they had to call the same tow truck driver/company which of course he was over an hour away. Once the tow truck driver arrived 3 hours after my truck broke down he said he was originally only 10 minutes from my location prior to on star sending him to the wrong location. What a mess. Have a loaner car because I have been told a fuel pump is on national backorder. Also that they will be replacing the valve springs which is another issue I think? hoping to know more this week.

- Davidsonville, MD, USA

Full enjine failure at 371 miles causing loss of control.vehicle was driveing on city street about 30mph when failure happen. Just prior to that vehicle stalled in traffic at a stop when waiting for a red light. Spring broken in piston causeing failure. Also had problems with info. System blanking out and no radio then when it did work no volume control on the radio. Info. System first failed when backing up and no radio at all. Second time when moving forward but I had radio but no volume control. 3rd time when backing up and no radio at all. 4th time when driving forward and no radio volume control, then a few minutes latter the engine fully failed. This vehilce was bought new and only had 371 miles on it. The engine is a 5.3 votec GM engine.

- Holt, MI, USA