The contact owns a 2013 Hyundai Elantra. The contact stated that while attempting to start the vehicle, there were several warning lights illuminated. The contact pressed START/STOP button several times before the vehicle started. The contact stated that the instrument cluster went black, and the radio and clock were inoperable. The contact stated that on other occasions the key fob failed to unlock the vehicle. The contact had the vehicle towed to a dealer to be diagnosed. The vehicle was diagnosed; however, the dealer was unable to determine the cause of the failure. The vehicle was not repaired, and the failure reoccurred several times. The contact had the vehicle towed back to the same dealer. The dealer diagnosed the vehicle and determined that the 12-Volt battery needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The manufacturer was not informed of the failure. The failure mileage was approximately 99,000.