The contact owns a 2015 Hyundai Sonata. The contact stated while driving at 45 MPH and approaching a stop sign, the vehicle started shuddering and stalled. The contact noticed smoke coming out of the hood of the vehicle. There were several unknown warning lights illuminated. The contact was unable to restart the vehicle after several attempts. The contact was able to push the vehicle to the side of the road with the assistance of a bystander. The vehicle was towed to an independent mechanic who informed the contact to take the vehicle to the dealer for repair. The vehicle was then towed to the dealer where it was diagnosed that the engine had failed and needed to be replaced. The dealer sent a claim with diagnostic report to the manufacturer ; however, the manufacturer declined to cover the repair. The contact followed up with the manufacturer and was informed that they could not assist as she failed to complete an unknown software update, under Service Campaign Number: 553, designed to report vehicle imbalances prior to the engine failure. The vehicle was not repaired. The failure mileage was approximately 142,000.