15 check engine lights after fixing damaged wire

Hey everyone,

I bought a 2016 Prius last year with minor front end damage. It ran perfectly for 8,000 miles, but with a check engine light (U0284 - Lost Communication with Active Grill Shutter). I didnt fix it at the time because I didnt notice it until I had the whole car put back together, and I was starting school in another state the next day. I decided to fix it this weekend (summer break).

After pulling the bumper off, I found that a wire had been cut in the accident (brown; front driver corner). I spliced it back together using a larger (16ga) wire, then turned my car back on.

A plethora of problems occurred:
-My car wouldnt read my key (required pressing the key up to the start button to start)
-check engine lights (see pics)
-triangle warning light
-“Shift System Malfunction” error message
-A/C system not working

I tried to fix it by:
-removing the larger guage spliced in wire and connecting the small wires together then hard resetting the car (1+ hour with negative terminal disconnected). No success.
-disconnecting the wire completely like it was before, then hard resetting the car (1+ hour with negative terminal disconnected). No success.
-continuity tested all fuses in the engine bay (all good).
-verified that there is no other wiring damage

Im not sure what to do now but I cant afford to take it to a mechanic (Im a student). If anyone has any thoughts or recommendations on diagnosing the problem, I would really, really appreciate the advice.

Thank you so much,
Adam

 

I should also note one thing:
Before I spliced in the new wire, the open wire leading back into the engine bay touched the subframe and I noticed a little “zap” when it happened. I’m going to try and find a wiring diagram to see what that could have affected.