2015 suburban weird issues in the rain

[Austin19]

I have a 2015 suburban and only when it rains does the instrument gauge needles fall and the anti theft light comes on and then it won’t let you turn it on once you turn it off. When everything finally dries out, it drives just fine with no issues. I have already replaced the bcm and done the g218 foam removal, I also cleaned up the ground behind the front tire. I also have a service side detection system light. Any advice would help!

 

[Geotrash]

I have a 2015 suburban and only when it rains does the instrument gauge needles fall and the anti theft light comes on and then it won’t let you turn it on once you turn it off. When everything finally dries out, it drives just fine with no issues. I have already replaced the bcm and done the g218 foam removal, I also cleaned up the ground behind the front tire. I also have a service side detection system light. Any advice would help!

Welp, you're gonna have to move to Arizona or Nevada, I reckon.

Or...can you give us just a bit more info? Specifically, what codes does it throw during or immediately after such an event?

My bet is that you have a wire or a connector that's getting wet and shorting to ground. The only way I know to diagnose this is to break out your meter when you're experiencing the problem and test every circuit in the fuse box for shorts to ground, followed by the ECM and BCM harness connectors. You can also look for physical damage in the harness where it rubs against any metallic surface.

A competent shop should be able to diagnose this for you also. My local indy shop is particularly good at electrical diagnosis, for example.

 

[Isaac2468]

Rear bumper sensor module for sure just unplug and your good to go

 

[eknockout]

Rear bumper sensor module for sure just unplug and your good to go

Did this really work its alot of threads with same issue and nobody can figure it out like he said car goes dead then after it dries starts up like nothing happened

 

[eknockout]

Did this really work its alot of threads with same issue and nobody can figure it out like he said car goes dead then after it dries starts up like nothing happened

I guess not

 

[Fless]

I guess not

No idea, since the OP posted once, then ghosted us. Hasn't been on since Nov. last year.

 

[ReaperHWK]

Most likely it’s the blind spot sensors in the rear; I had the same issue. Unplug them to verify.

Eventually they let in moisture and corrupt the CAN bus.

 

[eknockout]

Most likely it’s the blind spot sensors in the rear; I had the same issue. Unplug them to verify.

Eventually they let in moisture and corrupt the CAN bus.

did you just unplug them or replace them man help this is getting on my nerves been to dealer a few times they cant find whats wrong it dries out and runs back perfect they tell me they cant find it but it running now

 

[ReaperHWK]

did you just unplug them or replace them man help this is getting on my nerves been to dealer a few times they cant find whats wrong it dries out and runs back perfect they tell me they cant find it but it running now

unplug first. Then it went away (electrical problems). After that I replaced them and it’s all good.

 

[eknockout]

unplug first. Then it went away (electrical problems). After that I replaced them and it’s all good.

did you have to replace the boxes are just sensors and do they have to be reprogrammed and is it hard to replace sorry so many question but you giving me hope i was ready be done with the truck

 

[ReaperHWK]

did you have to replace the boxes are just sensors and do they have to be reprogrammed and is it hard to replace sorry so many question but you giving me hope i was ready be done with the truck

I replaced both and yes they need to be reprogrammed to your VIN, I had the dealer do the programming.

 

[eknockout]

Tha k

I replaced both and yes they need to be reprogrammed to your VIN, I had the dealer do the programming

I replaced both and yes they need to be reprogrammed to your VIN, I had the dealer do the programming.

Thank you