Home › Mini › 2007 › Cooper Base, 2D Hatchback, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Diagnostic Trouble Codes - GSAW56 Control Unit › Diagnostic Trouble Codes (GSAW56 Transmission Control) › DTC P1791, BMW Hex Code 0x4FB1, BMW Code 20401: Internal Transmission Control Module Memory Check Sum/EEPROM Error › Calculated value Y/N