Hyundai Sonata owners have reported 1 problem related to automatic transmission control module software (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Hyundai Sonata based on all problems reported for the Sonata.
The contact owns a 2017 Hyundai Sonata. The contact stated that while merging onto a highway at 50 mph, the vehicle independently decelerated to 30 mph and shifted into limp mode. The contact stated that an unknown warning light was illuminated on the instrument panel. The contact had initially taken the vehicle to an independent mechanic who was unable to determine the cause of the failure. The contact then had the vehicle towed to a dealer where he was informed that the failure was linked to a software update. The manufacturer was not notified of the failure. The failure mileage was 56,000.
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