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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): ? P1DB7 - Torque Converter Clutch Performance. Customers may also experience one or more of the following condition: ? Customer might perceive a slight difference in vehicle performance due to the Transmission Torque converter going in a default state. ? Acceleration may be poor at higher speeds. ? Engine speed will typically be higher for a given driving condition. ? Vehicle may suffer poor fuel economy. This bulletin involves reprogramming the TCM with the latest available software.