The contact owns a 2018 Ford F-150. The contact stated that while starting the vehicle, there was an abnormally loud knocking sound coming from the vehicle. There were no warning lights illuminated. The sound had become progressively louder over time. The contact stated that the failure was related to Customer Satisfaction Program: 21N03. The local dealer was contacted and confirmed that here was no coverage for the vehicle under the Customer Satisfaction Program. The vehicle was not diagnosed or repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline. The failure mileage was approximately 35,000.