saxon_t86

hello i have a 2000 clk 430 that went into limp mode went it died due to sitting for too long when i was in alaska i went to a buddys shop to have him reset it but it was not get any communication from ecm to the transmission has any one had this problem? we were using a snap on modis with all the right connections we were able to read everything else besides transmission issue if any one could help me id be grateful thank you saxon