TSB: 1.6T GDI ULEV MIL ON LOGIC IMPROVEMENT FOR P0128 - This bulletin provides the procedure to improve the logic of the ECU (Electronic Control Unit) on some 2016-2017MY Optima (JFa) 1.6T GDI ULEV DCT vehicles, produced from September 28, 2015 through September 03, 2016, which exhibit a MIL (Malfunction Indicator Lamp) illuminated with DTC P0128, even though there are no system faults.
