No crank, no start, code U0100

I have recently over two months ago had reputable shop replace alternator, starter, radiator, and belts, car drove rough slightly which was normal for me, after about a month my car began to make this weird whistling sound every time it ran. I didn't think much of it as it wasn't overheating or anything out of the ordinary. All fluid levels were awesome and hoses inspected were fine.

Eventually I noticed slight decrease in speed, acceleration, and misfiring occurring upon acceleration then.

This evening I go to turn on car it has a sluggish time kicking up and cranking. If I it let the key go to quickly it would die out!

However if I held the key in crank position long enough and applied gas it would start up fine it did the same thing eventually it only cranked up with the car being in neutral after a while

After driving for few weeks it started to do more odd things such as die at red lights and I would have to restart it seem it kept loosing it spark or something and couldn't start.

Then this morning it's super cold like any other morning I go to turn the key to crank it does nothing it's completely dead no sound nothing !

I attached code reader got one code U0100 lost communication with ECM/PCM A

I went immediately checked my ECM wire under hood near fuse box and it fine no burn nothing just crusty gel substance.

I then tested fuse have no clue it going this right but had key in on position and got read from the fuses except the:
*Injector fuse
*Engine bar fuse

ECM fuse under car on driver side nothing works in the fuse box on driver side just to note but again in not sure if i'm using multi-meter correctly.

I have no idea why my car randomly stop working when it was just working please can someone point me in right direction?