Why is the vehicle in limp mode because of getting wet?
Smashed the windshield out set out in
the rain now and reduced power mode.
Sounds like it’s really messed up. Electronics getting wet as well as wiring usually winds up totaling a vehicle. Your only hope is getting it inside and getting it hot enough to dry everything out and see what happens after that. This can take up to a week of sustained high temps of at least 80 degrees.
Electronics are not happy when they are wet. Maybe drying the car out will return things to normal but if they do not you will have expensive repairs.
Could it be the low oil or a wire harness?
When a vehicle like this starts having electrical problems it's a neverending rabbit hole! Especially when everything inside the dash has gotten wet! In my opinion it's not worth fixing! Junk it and move on! Hope that helps! Jim