21-025-15

Flash: 854RE Transmission Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customer may experience one or more of the following. ? Malfunction Indicator Lamp (MIL) illumination with Diagnostic Trouble Code (DTC) P0734 - Gear 4 Shift Incorrect Ratio set in the TCM memory. ? Bump sensation felt during engine start/stop transition on light throttle acceleration (Engine Stop Start (ESS) equipped vehicles only). ? Less than desired overall downshifts during normal driving. ? Less than desired downshifts during passing maneuvers. ? Less than desired upshift quality in lower gears.