Home › Volvo › 2011 › C30 R-Design, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Transmission Control Module Diagnostic Trouble Codes - 2 Of 2 › TCM-0A31: Control Module Communication. Signal Missing From Engine Control Module (ECM) (Aw55-50/51SN; 2007-2013) › Fault-Tracing Information