The contact owns a 2015 Chevrolet Silverado 1500. The contact stated that the check engine warning light illuminated while the vehicle was idling. The vehicle was taken to an independent mechanic, who stated that the pump was leaking. The mechanic stated that the engine block was running rich. The vehicle was taken to the local dealer, but the vehicle was not diagnosed or repaired. The manufacturer was contacted, opened a case, and referred the contact to the NHTSA Hotline. The contact stated that the failure was like NHTSA Campaign Number: 14V007000 (Engine and Engine Cooling). The approximate failure mileage was 992,000.

- Kingston, NJ, USA

The contact owns a 2015 Chevrolet Silverado 1500. The contact stated that while her husband was driving 75 MPH and overtaking another vehicle, the engine made an abnormal clunking sound, and the check engine warning light illuminated. Additionally, the engine started making abnormal knocking sounds. The contact's husband pulled into an AutoZone parking lot, where it was diagnosed and determined that cylinder #6 was misfiring and that the knock sensor had failed. The contact stated that her husband replaced the parts; however, the failure persisted. The vehicle was towed to the residence. The vehicle was then towed to the dealer, where it was diagnosed and determined that cylinder #6 was misfiring. The dealer determined that the lifters needed to be replaced. Additionally, the dealer informed the contact that further inspection was required to determine whether the camshaft needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 70,186.

- North Little Rock, AR, USA

The contact owns a 2015 Chevrolet Silverado1500. The contact stated that while driving at various speeds the vehicle would hesitate, stall and shut off at random times. The vehicle was taken to the local dealer who replaced a engine gasket but the failures continued to occur. The vehicle was later taken to an independent mechanic who diagnosed that the engine was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not yet notified. The failure mileage was 60,000.

- Titusville, FL, USA

The contact owns a 2015 Chevrolet Silverado 1500. The contact stated that he noticed a small leak coming from the radiator. The vehicle was taken to jeff schmitt Chevrolet South (125 S gebhart church rd, miamisburg, oh 45342) and it was stated that there were no recalls on the vehicle. The mechanic refused to look at the radiator. The contact reminded the dealer that tsb #: P1513F described the same symptoms as the issue however, the dealer stated that the VIN was not a match for the tsb. The contact stated that the issue was that the thermostat caused the radiator to thermo-cycle or quickly cool and heat up causing the radiator to leak. The manufacturer referred the contact to the NHTSA. The vehicle was not repaired. The failure mileage was 59,680.

- Franklin, OH, USA