Home >> Volvo >> 2005 >> XC70 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes (XC) - 5 Of 9 >> ECM-6100: Engine Cooling Fan Control Module. Faulty Signal. Intermittent Fault (B5254T2; 2003) >> Faulty signal. Intermittent fault