Home >> Volvo >> 2004 >> S80 Base, 2.5 59, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control Module (ECM) Diagnostic Trouble Codes - 9 Of 11 >> ECM-644A: Camshaft Reset Valve. Slow Control. Permanent Fault (B6284T; 1999-2001) >> Slow regulation