Home >> Volvo >> 2013 >> XC90 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 6 Of 13 >> ECM-630D: A/C Relay. Signal Too Low. Intermittent Fault (B5254T2; 2005-2007) >> Signal Too Low. Intermittent Fault