Home >> Volvo >> 2013 >> XC90 Base, AWD >> Repair and Diagnosis >> Electrical >> Body Electrical >> Accessory Electronic Module (AEM) And Central Electronic Module (CEM) - Diagnostic Trouble Codes - 2 Of 2 >> CEM-8F21: Wipers. Signal Too High/Signal Missing. Permanent Fault (2003-2004) >> Diagnostic Trouble Code Information