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.

 

[Yukon2703]

Holy shit we may have luck, I removed the rear bumper like suggested this evening along with the wiring harness for parking sensors and blind spot sensors, the harness shows signs of water and heavy corrosion at main connector and connectors at both blind spot sensors, I’ve included some pics. I’ll be ordering the harness and both sensors tomorrow. The passenger side blind spot sensor has taken on so much water that it froze and split open over time. This looks promising for fixing the problem, I’ll update once new parts are installed.

 

[Yukon2703]

Took the time to take apart the bad blind spot sensor. Gm should be ashamed to sell such garbage, the box has a plastic cover for protecting the board, the cover has no fastener of any type to hold it on, they use a super fine bead of cheap silicone to hold the cover on, it just popped off and when you rub the silicone between your fingers it just falls apart. I’ve included some pics of the unit disassembled. It was full of slat and corrosion. The unit is in a direct path of whatever comes off your rear tires. To make matters worse I called the local dealership today and was quoted a price is 807.13!, it’s also unavailable until July 30th. On top of that it needs to be programmed once installed. It boggles my mind that gm has the nerve to charge these crazy prices for a new Yukon knowing full well they’re building stuff to fail, and when it fails the prices to repair are sky high and made so that you can’t fix it yourself. Thanks General Motors!

 

[ScubaSteve1]

I have been having similar issues. Dash going crazy all gauges going to 0, no start issues, won’t shut off issues. I removed the bumper and unplugged the harness and currently it started and runs fine with none of the above starting or stopping issues. I’m curious if you unplugged yours and tried to run it before replacing the sensors and harness?

 

[Yukon2703]

I have been having similar issues. Dash going crazy all gauges going to 0, no start issues, won’t shut off issues. I removed the bumper and unplugged the harness and currently it started and runs fine with none of the above starting or stopping issues. I’m curious if you unplugged yours and tried to run it before replacing the sensors and harness?

I haven’t replaced anything, parts would be back ordered for months so I unhooked everything, put the bumper back together and have been driving ever since without any issues. I love these vehicles but man oh man do they ever fill them with garbage parts.

 

[PG01]

Good work