The contact owns a 2017 Hyundai Sonata Hybrid. The contact stated while driving 35 MPH, a message indicating a vehicle failure was displayed and the coolant temperature warning light illuminated. The contact stated that as she was veering to the side of the road, she saw white smoke rising up in the rear of the vehicle through the rearview mirror. Another driver also notified the contact of the white smoke. The contact stated that she parked the vehicle and opened the hood but could not determine the cause of the failure. The contact remained on the side of the road where she was waiting for the vehicle to be towed. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 116,495.