Home >> Volvo >> 2005 >> XC70 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes (XC) - 6 Of 9 >> ECM-630B: A/C Relay. Signal Missing. Intermittent Fault (B5254T2; 2005-2007) >> Signal missing. Intermittent fault