Home >> Volvo >> 2013 >> C30 T-5 R-Design, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 7 Of 8 >> ECM-830C: Alternator Control Module (ACM). Faulty Signal (B5254T7; 2008-2013) >> Signal Too High/Faulty Signal