The contact owns a 2006 Hyundai Santa Fe. The contact stated while driving approximately 70 mph when the vehicle began to accelerate without the accelerator pedal being depressed. The contact was able to pull over and noticed smoke coming from the engine compartment. The contact stated no warning lights were illuminated. The vehicle was towed to a local mechanic where it was not diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 143,000.