Had a bad jump start that fried a few things a few months ago. Replaced battery and alternator, so those are both new, and replaced the 100 amp mega fuse and A/C relays. The truck started and ran for several weeks, but then one day turned the key and it did absolutely nothing...also, absolutely NO lights on the dash display except for the check engine light. Had a friend test with scanner and it can't link with computer. Got a new programmed PCM, installed it, and same problem. I think it's a relay, but no idea which one.
Also, we've noticed that now the brand new battery goes dead quickly, like, in about 3 weeks. I just think that's awfully quick for a new battery to go totally dead. It's as if something is stuck ON and draining it. Any help would be greatly appreciated!

I bought a Chevy Colorado 2017 which had a problem of the ECU and after replacing and diagnosing the diagnostic machine can't scan the machine module

Can't get a code reader to read issues and and problems with the engine no power to the pcm

Can't get a code reader to read issues and and problems with the engine

Im haveing issues with my throttle body control system it an obs scan said its tbi a control lotor circuit range performance ive checked all wires running from pcm to throttle body voltage seems good i even put a diffrent used throttle body in and a used gas pedle and cant get out of limp mode ive reset pcm many times checked for blown fuses all seems good i did recently put a new fuse box but i cant see how that would effect this i dont know wat to do next any ideas???