Kendric Thompson

I have a 2020 gmc 2500 Denali after a hard rain my lights started flickering everytime I had my windshield wipers on then my horn went off by itself and wouldn’t come out of park. I took it to a dealer they replaced BCM and it comes out of park and lights stop flickering but now the brights stay on and won’t dinn /horn won’t blow /fog lights won’t work and my sprayer for the wiper won’t spray but wiper comes on. I did notice water damage on headliner in the back by 3rd brake light so I think it’s leaking but it comes on and works I also checked the fuses all good