The contact owns a 2018 Ford F-350 SD. The contact stated that after parking the vehicle in the driveway of their residence, the DPF regeneration process activated and completed, and the vehicle was turned off. The contact exited the vehicle. Approximately 15 minutes later, the contact discovered flames coming from under the hood. The fire department responded and extinguished the fire. The cause of the fire was not determined. The dealer and the manufacturer were not notified of the failure. The failure mileage was 150,000.