Home >> Volvo >> 2007 >> V50 Base, 2.4 39 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 6 Of 9 >> ECM-531D: Diagnostic Trouble Code (DTC) In The Central Electronic Module (CEM). Faulty Signal (B5244S4; B5244S7; 2005-2010) >> Faulty Signal