The contact owns a 2012 Kia Soul. The contact stated while driving 55 mph, she saw smoke exiting the rear of the vehicle. The contact stated no warning light was illuminated. The contact was able to park on the side of the road and after exiting the vehicle, she saw a fire that started under the vehicle. The fire department was able to extinguish the fire. The contact was unaware if a fire report was filed. The contact stated no one was injured or sought medical attention. The vehicle was not drivable. The vehicle was towed to her sister's residence. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 186,000.