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Flash: MIL Illumination, P1D73 AGS Performance Or U0140 Lost Communication With Body Control Module This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest software. The customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or both of the following Diagnostic Trouble Codes (DTC): P1D73 AGS (Active Grill Shutter) Performance. U0140 Lost Communication With Body Control Module.