Home >> Volvo >> 2004 >> V40 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes - 3 Of 3 >> ECM-91: Torque Reduction. Initialization Fault. Permanent Fault (B4204T2 CVVT; 2000) >> Initiation fault. Permanent fault >> Faulty signal >> Replacing engine control module (ECM) >> Installing control module