Home >> Volvo >> 2004 >> XC70 >> Repair and Diagnosis (Single Page) >> Electrical >> Motors, Switches, Relays >> Accessory Electronic Module (AEM) & Central Electronic Module (CEM) Diagnostic Trouble Codes (XC) >> AEM-5F11: Relay, Engine Block Heater. Signal Too High Or Signal Missing. Permanent Fault (2001-2007) >> Signal too high / Signal missing