Home >> Volvo >> 2009 >> V50 Base, 2.4 39 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 8 Of 9 >> ECM-830C: Alternator Control Module (ACM). Faulty Signal (B5254T7; 2008-2011) >> Signal Too High/Faulty Signal