Home › Volvo › 2004 › S40 T-5, Standard › Repair and Diagnosis › Transmission › Automatic Trans › Transmission Control Module (TCM) Diagnostic Trouble Codes - 1 Of 2 (544 Body) › TCM-0A31: Control Module Communication. Signal Missing From Engine Control Module (ECM) (Aw50/51 AWD; 2005-10) › Fault-Tracing Information