Home >> Volvo >> 2009 >> S60 Base, AWD >> Repair and Diagnosis >> Electrical >> Body Electrical >> Central Electronic Module (CEM), Rear Electronic Module (Rem), Upper Electronics Module (UEM) - Diagnostic Trouble Codes - 1 Of 13 >> CEM-1A21: Increased Power Supply Relay. Signal Too High. Intermittent Fault (2001-2004) >> Signal too high. Intermittent fault. >> Replacement of component