TSB: SERVICE ACTION: TCU UPGRADE ? DRIVING PERFORMANCE IMPROVEMENT (SA257) - This bulletin provides information related to the TCU (Transmission Control Unit) software upgrade of some 2017MY Sportage (QL) 2.0T-GDI/2.4GDI vehicles produced from December 10, 2015 through October 27, 2016 to improve the gear shift and acceleration performance logic.
