02 VW Jetta GLS Sedan 1.8 turbo gas w/ tiptronic 5 spd auto

02 VW Jetta GLS Sedan 1.8 turbo gas w/ tiptronic 5 spd auto trans…. Had OBD codes of 411 and 171..  put on new MAF, SAI Pump, New fuel pump, fuel filter and codes 171 & 411 gone but CEL came back on and Auto zone says it is OBD Code 1780…something about ECM & TCM not communicating.  Do you think that flashing the ECM might correct this or what is you thoughts on fixing  the problem causing the 1780 code.

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