One problem related to electrical system has been reported for the 1999 Hyundai Sonata. The most recently reported issues are listed below.
Upon starting the vehicle, all the warning lights on the dashboard stayed illuminated. The vehicle shut off and didn't restart for 2 days. The dealership performed a diagnostic test, but no failure code was found. The check engine light had come on three times since the consumer had the vehicle. On one occasion, it had taken three attempts to start. After the consumer picked the vehicle up from the shop, it had left the consumer stranded.