[Fiilthyy]

So basically I have an auto 2014 Camaro SS and I took my engine and trans out cause I didn’t know whether my trans took a shit or if it was my torque converter which later I found out it was the torque converter and I also had ordered my cam kit with dod delete & vvt delete so to not struggle with the engine inside the car removing my heads etc etc it was easier for me to pull everything out and do everything on an engine stand, I replaced my converter and put the cam in then when I slapped everything back into the car I connected all the sensors, grounds, etc etc and I got my ecm flashed by a local tuner to be able to turn it on to check for any leaks but when I put my key in it wouldn’t crank only the check engine light willl showed I swapped out my battery thinking it was a dead battery since the car didn’t move for like 1 month then still the same issue, I then checked my starter and it was perfect, I plug in the scanner and the code U0100 pops up saying “lost communications with ecm/pcm” , I then check my fuses and they’re all good, the trunk the driver side panel and under the hood.. I then take my entire harness off to replug everything back in to make sure I didn’t skip any grounds or any plugs but everything seems to be in order and only 1 plug that isn’t plugged in which was the DOD valley cover plug, what could be my issue? I’ve been struggling for 4 days trying to find the issue. It also doesn’t go into any gear it’s stuck in park and says “engine power reduced” or something like that can’t recall . Any help is appreciated! Sorry for the very long paragraph btw lol