Home › Volvo › 2004 › XC90 Base, AWD › Repair and Diagnosis › Transmission › Automatic Trans › Transmission Control Module (TCM) Diagnostic Trouble Codes - 3 Of 9 › TCM-0048: Control Module. Faulty Software (Aw50/51 AWD; Aw55-50/51SN; 2003-2007) › Faulty Software