So my local repair shop said that they basically took the car apart to check all faults. They ended up pinpointing all the faults to the rear PDC harness in the back bumper. They said there 90% sure that's the cause. Should know today because they had to go to the dealer for the part. I want to know if it had to do with any water.

The car wash I went through also had high pressure undercarriage wash while entering.