TSB: SERVICE ACTION: 3.3 GDI ULEV ECU MIL WITH DTC P0456 LOGIC IMPROVEMENT (SA397) - This bulletin provides the procedure to improve the logic of the Engine Control Module (ECM) on some 2019-2020MY Sedona (YP) 3.3 GDI 8AT ULEV vehicles, produced from February 13, 2018 through August 27, 2019, which may exhibit an ECM MIL ON with DTC P0456.
