The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while stopped at a stop light, the vehicle began to shake violently. There was no warning light illuminated. The contact then stated that there was an abnormal knocking sound coming from the engine while depressing the accelerator pedal. The contact pulled over and restarted the vehicle; however, the knocking sound persisted. The contact slowly drove the vehicle to the residence and later had the vehicle towed to the dealer. Upon investigation, the contact discovered NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The vehicle was not diagnosed or repaired and remained with the dealer. The manufacturer was not notified of the failure. The failure mileage was approximately 34,000.

- Hobbs, NM, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The vehicle was taken to the dealer, where the contact was informed that the recall parts were not yet available, and that the dealer had been made aware of the recall. The manufacturer was not made aware of the issue. The contact had not experienced a failure.

- Canton, GA, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving 55 MPH and depressing the accelerator pedal, the vehicle failed to respond as needed, and the vehicle lost motive power and came to a stop in the middle of a four-lane highway. There was no warning light illuminated. The contact was unable to pull over to the side of the road, and the vehicle failed to restart. The vehicle was towed to an independent mechanic, where it could not be serviced. The vehicle was then towed to the dealer, where metal shavings were found in the oil pan, and the contact was informed that the engine needed to be replaced. The contact stated that the vehicle remained at the dealer for a month, and the dealer was in the process of ordering the part. The vehicle was not yet repaired. The contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The manufacturer was notified of the failure and informed the contact that assistance would not be provided because the vehicle was purchased used and was not covered under warranty. The failure mileage was approximately 135,000.

- Magalia, CA, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving 30-40 MPH, the check engine warning light and other unknown warning lights were illuminated, and the engine was running rough. The vehicle was taken to an independent mechanic, where the contact was informed that the vehicle could not be diagnosed due to a lack of equipment. The vehicle was then taken to Gary Sapp Automotive, where it was diagnosed with engine failure. The mechanic determined that the engine needed to be taken apart for the repair or replacement. The vehicle was not repaired due to the cost. The contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The manufacturer was notified of the failure and informed the contact that the vehicle was not covered under an extended warranty. The failure mileage was approximately 89,000.

- Pensacola, FL, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, there was a ticking sound coming from the engine compartment, and the vehicle lost motive power. There was no warning light illuminated. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The vehicle was towed to the dealer, where it was diagnosed with crankshaft failure. The dealer discovered metal shavings in the engine oil and oil filter, and the contact was informed that the engine needed to be replaced. The replacement engine was ordered, and the vehicle was repaired. After the engine replacement, the contact stated that while driving at an undisclosed speed, the vehicle felt difficult to operate. Additionally, while the vehicle was parked and turned off, the vehicle failed to restart and lost motive power without any warning lights illuminated. The vehicle was inspected by an independent mechanic, who found that the metal bar located near the battery was very loose. The mechanic also informed the contact that due to the prior crankshaft failure, the transfer fuse box, starter motor, and battery had failed and required replacement. The vehicle was repaired. The contact stated that upon inspecting the replacement engine, the manufacturer-??s sticker indicated that the engine was a remanufactured engine, and there was dirt and debris on the engine. The manufacturer was made aware of the failure. The approximate failure mileage was 48,650.

- Rochester, WA, USA

See attached document for complaint.

- Lansing, IA, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted and confirmed that parts were not available for the recall repair. The manufacturer was made aware of the issue and confirmed that there was no expected date for parts availability. The contact had not experienced a failure.

- Austin, PA, USA

The contact's son owns a 2021 Chevrolet Silverado 1500. The contact stated that while her son was driving at a moderate speed, the vehicle lost motive power without warning. Due to the failure, the vehicle was towed to a dealer where the contact was informed that the vehicle was included in NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The contact was also notified that the parts for the recall repair were unavailable. The vehicle remained with the dealer. The vehicle was not repaired. The contact's husband notified the manufacturer of the failure and was provided a case number. The failure mileage was 47,000

- Lewisville, TX, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that the oil change message was displayed. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The contact called the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was unknown.

- Warren, MI, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at various speeds, the engine was misfiring. The vehicle was taken to an independent mechanic, where the contact was informed that the cylinders were misfiring, and the mechanic recommended that the spark plugs be replaced. The contact replaced the spark plugs with the assistance of a retired mechanic; however, the failure persisted. The vehicle was taken back to an independent mechanic and was diagnosed with a cylinder misfire. The mechanic recommended removing the dynamic fuel system management by replacing the camshaft, lifters, and other unknown parts. The dealer was notified of the failure and advised the contact to schedule an appointment for a diagnostic test. The vehicle was not repaired. The contact related the failure to GM Campaign Number: N212353840. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 65,000.

- Chalmette, LA, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving approximately 70 MPH, there was a knocking sound coming from the engine compartment before the vehicle went into "LIMP Mode" and decelerated to approximately 35 MPH. The check engine warning light was illuminated. The vehicle was driven to the local dealer, who diagnosed that the engine "Crank Shaft" had failed and needed to be replaced. The manufacturer was notified of the failure and informed the contact that the VIN was not included in NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 165,000.

- Madison, WI, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The dealer was contacted, and the contact was informed that the parts were unavailable. The contact stated that the manufacturer had exceeded the limited time frame to have the parts available. The manufacturer was contacted; however, the contact was informed that parts were not yet available. The contact had not experienced a failure.

- Vernon, AZ, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact had received notification of NHTSA Campaign Number: 25V274000(Engine and Engine Cooling). The contact stated that upon taking the vehicle to the dealer for a routine oil change, the contact requested an engine inspection and oil change. The dealer performed the oil change; however, the dealer informed the contact that the recall remedy was not yet available for the vehicle. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was informed of the issue. The contact had not experienced a failure.

- Wyanet, IL, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The contact stated that while driving at approximately 45 MPH, the vehicle lost motive power. The contact pulled over to the side of the road however, the vehicle failed to restart. The vehicle was towed to a dealer, where it was diagnosed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 47,000.

- Montgomery, AL, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the oil pressure level fluctuated between 60 and 0. The contact stated that the low-pressure oil warning light was illuminated. The contact stated that the oil level was continually being topped off. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The dealer was made aware of the failure but provided no assistance. In addition, the contact was advised to have an oil change every 1,000 miles while waiting for the recall repair to be performed. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the failure. The failure mileage was 40,000. VIN tool confirms parts not available.

- Nashville, NC, USA

The contact owned a 2021 Chevrolet Silverado 1500. The contact stated that while coming to a stop, the contact heard a loud sound coming from the engine compartment. The check engine warning light was illuminated. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the repair was unavailable. The vehicle was taken to the dealer, where it was diagnosed and determined that the connecting rod and the crankshaft engine components had failed, and the engine needed to be replaced. The vehicle was not repaired, and the dealer confirmed that parts were not yet available. The manufacturer was not made aware of the failure. The failure mileage was approximately 70,000. Parts distribution disconnect.

- Dover, DE, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while operating the vehicle, there was a popping sound coming from the engine compartment, and the vehicle decelerated unintendedly and started driving rough. The vehicle was driven to the local mechanic who diagnosed an engine cylinder misfire. The mechanic replaced the fuel injector and engine lifter, and the vehicle was repaired. The contact stated that recently while driving, the same popping sound reoccurred, and the vehicle started to lose motive power. The vehicle was towed to the local mechanic who determined that the engine had failed. The exact cause of the engine failure was not determined. The manufacturer was notified of the failure, but no assistance was offered. The contact was informed that the VIN was not included in the NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 42,239.

- Menomonee Falls, WI, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while his wife was driving 35 MPH, the vehicle was making abnormal sounds. The driver drove the vehicle back to the residence. While driving at undisclosed speeds, there was an abnormal ticking and knocking sound coming from the vehicle. The contact stated that the sound went away and came back. While driving at an undisclosed speed, the vehicle lost motive power and stalled. The contact stated that the engine warning light was illuminated. The contact stated that the failure was related to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included. The vehicle was taken to the local dealer, but the vehicle was not diagnosed or repaired. The dealer informed the contact missed an oil change and was negligent in servicing the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was contacted. The failure mileage was approximately 67,000.

- Jacksonville, FL, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving 70 MPH, the vehicle jerked and failed to accelerate as intended while depressing the accelerator pedal. The contact stated that the engine seized. The check engine warning light was illuminated before the failure. The contact was able to coast to the side of the road. The contact stated that the vehicle was towed to Midas, where it was diagnosed and determined that the fuel pump control unit had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The contact related the failure to NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, the VIN was not included. The failure mileage was approximately 57,000.

- Freeport, NY, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that upon starting the vehicle, there was an abnormal tapping sound coming from the engine, with the check engine warning light displayed on the instrument panel. The contact stated that while driving at various speeds, the vehicle jerked and hesitated while depressing the accelerator pedal. The vehicle was taken to an independent mechanic and a dealer, where diagnostic tests were performed. The contact was informed that the engine lifters were defective; therefore, the engine needed to be replaced. Recently, the contact stated that while at a stoplight, the vehicle shut off and failed to restart. Due to the failure, the contact had the vehicle towed to the residence. The vehicle was not repaired. A mechanic later informed the contact about NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, upon investigation, the contact discovered that the VIN was not included in the recall. The manufacturer was then notified of the failure and confirmed that the vehicle was not included in the recall. The contact was then referred to the NHTSA Hotline to report the failure. The failure mileage was approximately 97,000.

- Fort Worth, TX, USA