The contact owns a 2017 Ford Mustang. The contact stated that while driving at an undisclosed speed, the contact noticed smoke on the interior of the vehicle. The contact stated that the smoke became heavy on the interior of the vehicle. The contact stopped the vehicle and became aware that the heavy smoke was coming from the trunk of the vehicle. The Fire Department arrived on the scene and extinguished the fire. No injuries were sustained. The vehicle was towed to a local tow yard. The vehicle was not inspected. A Police report was filed. The manufacturer was not made aware of the failure. The failure mileage was approximately 120,000.