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

[Yukon2703]

As always whenever we get wet weather our 2015 Yukon won’t start. The dash goes funky, all the warning lights, multiple service issues on screen like
-service airbag
-service trailer brake
-service steering column lock
-service front camera (doesn’t even have one)

Sometimes dash will go black like dead battery, won’t roll over at all then dash will go funky. Weirdest of all it will start off factory remote start on fob. I managed to get the scan tool on it and this is everything it gave me

Service steering column lock
Service airbag
Service front camera


C0110-61 pump motor circuit - stuck
Erased and all went away

U0140-00 lost comm with bcm
U0155-00 lost comm with IPC
U0170-00 lost comm with pass presence module

Erased and all went away


B2575-04 headlamps control circuit open

B2645-07 ambient light sensor high voltage

B2699-04 right headlamp circuit open

B305A-00 no response from steering column lock received

B3111-00 keyless entry transmitter 3 battery

B3935-00 transponder authentication

B3979-00 no environment identified received from hvac module

C0755-29 right front pressure sensor to few pulses

C0750-29 left front tire pressure sensor to few pulses

C0760-29 left rear

C0765-29 right rear

U0078-00 control module communication low speed CAN bus off

U0164-00 lost comm with HVAC module

U0208-00 lost comm with seat memory

U0236-00 lost comm with steering control module

Erased and all gone but

B305A-00 & B3111-00



U0029-00 MOST bus performance

Erased and went away



U0078-00

U0151-00 lost comm with inflatable restraint sensing and diagnostic module

U0155-00

U0184-00 lost comm with radio

U0198-00 lost comm with telematic control module

U0230-00 lost comm with liftgate control module



Erased all went away except

U0184-00 & U0230-00 stayed

This has been a major pain in the hole, I’ve seen many other write ups with similar problems but I’m yet to come across a fix, has anyone managed to find a fix to this extremely frustrating problem. Any help would be appreciated, doing everything I can to avoid a trip to hells gate (local dealership).

Thanks

 

[PG01]

So, next time its dry for a few days and the truck is dry and acting ‘normal’ park it in the sane spot your issue happens when it rains then bust out your garden hose and try to wet down the truck 1 section at a time. Do the passenger side roof, windshield, hood and fender…. See if it starts, driver side …. Etc etc. but wait a day or two so that the trucks acts ‘normal’ and then do the other side.
my guess is you are getting water in the cabin under the dash or somewhere or under the hood to the fuseblock.

 

[the 18th letter]

It starting normally with the Key FOB throws a wrench in all my suggestions.

 

[Yukon2703]

So, next time its dry for a few days and the truck is dry and acting ‘normal’ park it in the sane spot your issue happens when it rains then bust out your garden hose and try to wet down the truck 1 section at a time. Do the passenger side roof, windshield, hood and fender…. See if it starts, driver side …. Etc etc. but wait a day or two so that the trucks acts ‘normal’ and then do the other side.
my guess is you are getting water in the cabin under the dash or somewhere or under the hood to the fuseblock.

I’ll absolutely try that, I’ve already went down that road a bit, had shark fin off and made sure it was sealed up good, I had one guy talk about wiring issues under dash pad next to windshield so I removed it and no water or issues in there. But I’ll gladly try it out, gotta figure something out. Thanks for the ideas, I appreciate it.

 

[Yukon2703]

It starting normally with the Key FOB throws a wrench in all my suggestions.

I’ll gladly take all suggestions, I went this morning and tried it and no go again. Key fob wouldn’t work either this time so it’s just dead in the driveway.

 

[Z15]

May not be related to your situation but I'll relate this experience a coworker had.

His 1990's Mercury Marquise would not start when damp outside. Someone suggested we spray down every electrical connection and ignition related wires with WD40. We did that and it started right up. Back then it was easy, just replace all the ignition parts and solved problem. Nowadays, any wire can be the culprit.

WD40 = Water Displacement formula #40

 

[Geotrash]

As always whenever we get wet weather our 2015 Yukon won’t start. The dash goes funky, all the warning lights, multiple service issues on screen like
-service airbag
-service trailer brake
-service steering column lock
-service front camera (doesn’t even have one)

Sometimes dash will go black like dead battery, won’t roll over at all then dash will go funky. Weirdest of all it will start off factory remote start on fob. I managed to get the scan tool on it and this is everything it gave me

Service steering column lock
Service airbag
Service front camera


C0110-61 pump motor circuit - stuck
Erased and all went away

U0140-00 lost comm with bcm
U0155-00 lost comm with IPC
U0170-00 lost comm with pass presence module

Erased and all went away


B2575-04 headlamps control circuit open

B2645-07 ambient light sensor high voltage

B2699-04 right headlamp circuit open

B305A-00 no response from steering column lock received

B3111-00 keyless entry transmitter 3 battery

B3935-00 transponder authentication

B3979-00 no environment identified received from hvac module

C0755-29 right front pressure sensor to few pulses

C0750-29 left front tire pressure sensor to few pulses

C0760-29 left rear

C0765-29 right rear

U0078-00 control module communication low speed CAN bus off

U0164-00 lost comm with HVAC module

U0208-00 lost comm with seat memory

U0236-00 lost comm with steering control module

Erased and all gone but

B305A-00 & B3111-00



U0029-00 MOST bus performance

Erased and went away



U0078-00

U0151-00 lost comm with inflatable restraint sensing and diagnostic module

U0155-00

U0184-00 lost comm with radio

U0198-00 lost comm with telematic control module

U0230-00 lost comm with liftgate control module



Erased all went away except

U0184-00 & U0230-00 stayed

This has been a major pain in the hole, I’ve seen many other write ups with similar problems but I’m yet to come across a fix, has anyone managed to find a fix to this extremely frustrating problem. Any help would be appreciated, doing everything I can to avoid a trip to hells gate (local dealership).

Thanks

I'd start with a good cleaning of all of your ground points in and near the engine bay and BCM. After that, I would suspect the BCM or at least its connections. The WD40 on the BCM main connector is a good idea to try. Given that the behavior is different when using the key fob, I would trace the wiring from the start button to the fuse block and BCM as well.

 

[Doubeleive]

I agree with Dave, pop the hood take the battery cables off, start wiring brushing the contacts and wire brush any power or ground spots you can find in the engine bay, engine, frame grounds, under the body, etc.
look closely for any visible signs of corrosion or rust.
then you will probably want to start looking for any visible signs of rubbed or exposed wiring front to back
get a flashlight and start looking everywhere under the truck

 

[Geotrash]

One more thing I'll add: If the temperature of the vehicle is cooler than the air temperature, as often happens first thing in the morning, then the humidity in the air condenses onto the cooler surfaces of the vehicle, even under the hood. This condensation can cause all kinds of problems, including partial shorting of circuits, and otherwise interfere with any electrical circuits and wiring exposed to condensate. Wes's advice is also sound, in my opinion.