It Rained so 2015 Yukon won’t start, Help!

[Tultruk]

2015 GMC Yukon XL. Harness part# 23316326
Removed rear bumper and replaced harness myself to save the obscene amount the dealership wanted.

 

[Tultruk]

Dealership diagnosed the issue. Upon removal of harness it was full of water. I also replaced the proximity sensors on both sides in rear bumper.

 

[Hey you]

Is the cowl panel in place, just below the wipers. Also, there should be small connector panel on the end of each side. I think this could allow
water into the electronic systems. Battery and chassis ground points should be checked also.
My cowl panel is not in the best shape, but I have it taped with gorilla tape and its nice and tight now.

 

[Yukon2703]

I don’t suppose you have the part numbers for the switches? Also do you mean the parking sensors when you say proximity switches?

 

[Yukon2703]

Is the cowl panel in place, just below the wipers. Also, there should be small connector panel on the end of each side. I think this could allow
water into the electronic systems. Battery and chassis ground points should be checked also.
My cowl panel is not in the best shape, but I have it taped with gorilla tape and its nice and tight now.

I seen that some people had issues under the cowl, I took mine out and and checked it and they seemed good.