Throwing these VCM codes and just wanted to see what the consensus was here.. I'm not very savvy when it comes to wiring diag so if I could get pointed in the right direction that'd be great. Attached below are all codes. Is the ECM FUBAR or is it wiring? 1999 Chevy Blazer.. vehicle is still running

 

The class 2 communication network is a serial data bus with multiple computers and modules on it. It operates like the old party line telephone system from the 50's (I am old AF). Yes the computer can be FUBARed but there are many other explainations for a corrupted class 2 data stream. More often than not one of the modules on this shared bus has malfunctioned and is spewing garbage or pulling the line low or high so any and all modules are struggling to communicate properly. There is a comb connector under the dash were you can take everything offline and add the modules back one at a time to see if one of then is causing the problem, If the problem is intermittent then its harder to diagnose. Lastly, as is always the case powers and grounds or wiring can also cause these problems. Let me know if you want to proceed with diagnosis. This is a difficult problem for the shade tree mechanic because most of us do not have the high end gear to monitor an diagnose these computer systems. Could a new ECM do the trick? Yes its possible but not garaunteed to be the issue.

George