What would cause all these codes at once?

 

What happened just before all of these codes popped up?

This is awful hard to diagnose remotely given the huge number of issues. It generally seems electrical based though, so I'd probably start by breaking out the multimeter and wiring diagrams and seeing what voltage these circuits are actually seeing. You could also look for where these circuits tie in together (seems bcm may be a common component) to see if thats got a good ground and input voltage.