One problem related to mid/rear seats assembly has been reported for the 2013 Hyundai Sonata Hybrid. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Hyundai Sonata Hybrid based on all problems reported for the 2013 Sonata Hybrid.
Two weeks ago the rear left seat spontaneously caught fire while driving. I believe this was caused by the seat warmers but the case is still under investigation. Hyundai corporate America has been extremely unresponsive to this issue.