Trailer lights flashing

[bamorris2]

I know this has been covered in many other threads,  and that the truck pulses the lights every several seconds as part of the trailer security feature. Mine does that too. But it will then start to flash much more rapidly. Like multiple times per second. See attached video. Anyone else have this happen and know what causes it?

Edited March 10, 2021 by bamorris2

[sldhead700]

It's flashing your clearance lights and taillights. I would guess a wiring issue? Have you tried a test light on the back of your truck to make sure that it's right?
If so, than it's on the trailer side of things.

Sent from my Pixel 4 XL using Tapatalk

[bamorris2]

2 minutes ago, sldhead700 said:

It's flashing your clearance lights and taillights. I would guess a wiring issue? Have you tried a test light on the back of your truck to make sure that it's right?
If so, than it's on the trailer side of things.

Sent from my Pixel 4 XL using Tapatalk
 

Yes all of the power sources are getting proper power. It only does this when the truck is parked and off. It stops just by unlocking the truck or starting it up. All of the trailer lights work perfectly otherwise. 

[sldhead700]

Yes all of the power sources are getting proper power. It only does this when the truck is parked and off. It stops just by unlocking the truck or starting it up. All of the trailer lights work perfectly otherwise. 

Ohh..... Beyond my experience.
I'll be watching to see what you find, hopefully others will have the answer!

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[SilveradoRST]

Maybe this?

 

https://gm-techlink.com/?p=14165

 

or 

 

https://gm-techlink.com/?p=13853

Edited March 10, 2021 by SilveradoRST

[sldhead700]

I know this has been covered in many other threads,  and that the truck pulses the lights every several seconds as part of the trailer security feature. Mine does that too. But it will then start to flash much more rapidly. Like multiple times per second. See attached video. Anyone else have this happen and know what causes it?

Any updates, was the tech bulletins from rst helpful? Just curious.

 

Sent from my Pixel 4 XL using Tapatalk

 

 

 

[Greyhound6.2]

Mine will flash rapidly several times per second if I lock my truck by pressing the button on the outside of the door handle. However it will act completely normal if I use the key fob to lock the truck. Not sure of why it acts differently but it is 100% repetable like that. Only the brake/tail lights flash rapidly