One problem related to battery dead has been reported for the 2011 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Hyundai Sonata based on all problems reported for the 2011 Sonata.
The battery dies every night. I cut off all the lights, the radio, and etc. Yet I continuously wake up to a dead battery! something is draining my battery.