Home › Volvo › 2011 › V50 T-5 R-Design › Repair and Diagnosis › Transmission › Automatic Trans › Transmission Control Module (TCM) Diagnostic Trouble Codes - 2 Of 2 › TCM-0A30: Control Module Communication. Signal Missing From Engine Control Module (ECM) (Aw55-50/51SN; 2005-2011) › Fault-Tracing Information