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Flash: Transmission Control Module (TCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set: ? P0729-00 - Automatic Transmission 6th Gear Incorrect Ratio. The customer may also experience one or more of the following: ? Vehicle is in limp mode. ? Rough shift. This bulletin involves reprogramming the TCM with the latest available software.