One problem related to ignition has been reported for the 2009 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Hyundai Sonata based on all problems reported for the 2009 Sonata.
The contact was repairing a 2009 Hyundai Sonata. While driving various speeds, the ignition would inadvertently restart while the vehicle was in motion. The starter motor could be heard re-engaging. The driver was able to drift to the side of the road, shifted the gear into neutral, and restarted the vehicle correctly. After several minutes of normal operation, the failure recurred. The vehicle was taken to an independent mechanic and then to a dealer where it was diagnosed that a new key cylinder and ignition switch needed to be installed. The vehicle was not repaired. The manufacturer was notified. The failure mileage was 48,000.