The contact owns a 2018 Ford F-150. The contact stated that upon starting the vehicle, there was an abnormal rattling sound coming from the engine. No warning lights were illuminated. The contact called the local dealer, but the vehicle was not diagnosed or repaired. The failure persisted over time. The manufacturer was made aware of the failure and referred the contact to the NHSTA Hotline for assistance. The contact related to the failure of Technical Service Bulletin Number: 20-2315. The failure mileage was approximately 144,000.