One problem related to software has been reported for the 2005 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Hyundai Sonata based on all problems reported for the 2005 Sonata.
The check engine light keeps coming on. The dealer has tried to fix it three times. The first time the engine light came on the car only had about 12 thousand miles. The light did not come back on for over 10 months. The car now has about 22 thousand miles and the dealer has tried to get the light to go off twice in the last month. The last time was about two weeks ago and the light stayed off for two weeks and now its back on. The dealer kept the car for a week and the light only stayed off for two weeks! the transmission seems to drag when the check engine light comes on.