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-830D: Alternator Control Module (ACM). Signal Too High (B5254T7; 2008-2011) >> Signal Too High/Faulty Signal