The contact owned a 2015 BMW X3. The contact stated while her husband was driving at 65 MPH with her in the front passenger seat, the vehicle stalled. A message indicating a power train malfunction was displayed. The contact's husband was able to veer to the side of the road. The contact noticed dark smoke coming through the AC vents. The contact stated upon opening the hood, her husband saw fire. The contact immediately exited the vehicle. The contact was able to extinguish the fire with the assistance of the fire department. However, the engine compartment and the front passenger's side end of the vehicle had melted. A fire department was filed. There was no police report filed. There were no injuries sustained. The vehicle was towed to a tow lot where it was totaled. The contact associated the failure with NHTSA Campaign Number: 21V907000 (Fuel System, Diesel). The dealer was notified of the failure and referred the contact to the manufacturer. The manufacturer was notified of the failure but provided no assistance. The failure mileage was approximately 76,000.