The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that the vehicle was making an abnormal knocking sound while driving at various speeds and while idling. There was no warning light illuminated. The vehicle was taken to the dealer, where the engine lifters were replaced; however, the failure persisted. The vehicle was taken back to the dealer, where the contact was informed that the engine abnormal knocking sound was not sufficiently loud to issue a recall. The vehicle was not repaired. The contact related the failure to NHTSA Action Number: PE25001 (Engine, Engine and Engine Cooling). The manufacturer was not notified of the failure. The failure mileage was approximately 11,000.

- Hawley, MN, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving approximately 50 MPH, the engine started rumbling with the check engine, stability-trac, and the parking brake warning lights illuminated. The vehicle was taken to an independent mechanic who diagnosed a misfire in cylinder #1. The mechanic referred the contact to the dealer for assistance. The vehicle was taken to the dealer, who diagnosed that the lift valve had collapsed, and the right side of the block lifters needed to be replaced. The vehicle was not repaired. The manufacturer was informed of the failure and referred the contact to the dealer for assistance. The failure mileage was 80,000.

- Massapequa, NY, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated upon shifting into reverse(R), the vehicle shut off. The contact stated upon shifting to park(P) to restart the vehicle, the vehicle was able to restart after pressing the Push to Start button several times, and the vehicle made abnormally loud cranking, banging, and rattling sounds. The contact stated that he was an independent mechanic and had determined that the engine was blown, despite the outstanding maintenance record on the vehicle. The vehicle was towed to the dealer, where it was diagnosed that the engine had failed due to lifters failure. The dealer determined that the engine needed to be rebuilt or replaced. The dealer informed the contact that the engine might be replaced because the parts needed for the rebuilding of the engine were on backorder. The dealer informed the contact that the engine oil would be tested. The dealer also informed the contact that a claim was filed with the manufacturer for the repair to be covered under warranty, and the dealer was awaiting a response from the manufacturer. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 27,820.

- Chester, SC, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving at an undisclosed speed, the contact observed an excessive amount of condensation on the interior of the vehicle. The check engine warning light was illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the lifters resulting in misfires in the engine. The dealer also determined that cracks in the rear windshield glass guides resulted in excessive condensation in the vehicle. The vehicle was not repaired. After investigating the failure, the contact related the failure to Technical Service Bulletin: 18-NA-383. The manufacturer was notified of the failure, a case was opened. The contact was referred to the NHTSA Hotline for assistance. The failure mileage was 9,000.

- Ukiah, CA, USA

The contact owned a 2021 Chevrolet Silverado 1500. The contact stated that approximately 35 minutes after parking and turning the vehicle off he was notified that the vehicle had caught on fire. The fire department was called to the scene and extinguished the flames. Upon inspection, it was determined that the fire originated in the engine compartment. A police and fire report was taken at the scene and the vehicle was towed away. During the incident, the vehicle was destroyed. The manufacturer and local dealer were notified of the incident. The failure mileage was 12,000.

- Iowa City, IA, USA