Home >> Volvo >> 2007 >> XC70 >> Repair and Diagnosis >> Electrical >> Body Electrical >> Accessory Electronic Module (AEM) & Central Electronic Module (CEM) Diagnostic Trouble Codes (XC) >> CEM-1A21: Increased Power Supply Relay. Signal Too High. Intermittent Fault (2001-2004) >> Signal too high. Intermittent fault. >> Replacement of component