One problem related to power steering pump 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.
While driving at various speeds the "esc off" light illuminates for no reason. This has happened while driving on the freeway, normal surface streets, and has occurred while braking. Power steering goes out randomly during turns while on city streets or highways. Took the vehicle to a mechanic who tested the power steering and found no issue with the power steering pump. The pump is in good working order and did not need to be replaced. I had seen other complaints on the steering, with a recall issued, on 2008 and 2011 Sonata models, however the 2009 model was not included. This is very dangerous and could cause a crash. On those recalls the computer circuit board in the power steering control unit had become damaged and made the vehicle more difficult to turn possibly causing a wreck. Steering issue has been ongoing over the years.