Home >> Volvo >> 2007 >> S40 Base, 2.4 39, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 8 Of 10 (544 Body) >> ECM-830C: Alternator Control Module (ACM). Faulty Signal (B5254T3; 2005-2007) >> Signal Too High/Faulty Signal