Home >> Volvo >> 2007 >> S40 Base, 2.4 38, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Am/Fm Tuner Module (AFM) , Audio Module (AUD) And Integrated Audio Module (IAM) Diagnostic Trouble Codes (544 Body) >> AUD-0021: Control Module. Internal Fault (2006-2011) >> Internal Fault