Hyundai Sonata 2009–2010 — technical service bulletin
Bulletin TSB-10-01-023 · NHTSA communication 10034491 · issued Jun 1, 2010
Technical service bulletin
communication type
Electrical System
component
2009–2010
model years
2
vehicle entries
Official summary
Hyundai: automatic transaxle ecm and tcm update. Provides a procedure to update the ecm and tcm software to the most recent versions to revise-acceleration feel from a stop or below 15mph; shift quality when decelerating to a stop at about 30mph when the atf is cold. *pe
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.