2019 Chevy trailer lights flickering, truck lights are not

carlosh · May 4, 2019

Attached the boat to the truck for the first time today. After a minute and 10 seconds the lights on the trailer flicker/flash. The lights on the truck did not and are not flashing.

I do have the trailering package if that matters any too.

Video was taken this morning.

Anyone run into this?

http://cloud.tapatalk.com/s/5ccdfc802c694/20190504_060215.mp4

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davester · May 4, 2019

I read some posts on a forum (I follow a number, so I'm not sure where), that it's a security thing, where the truck is continuously testing that the trailer is still connected, but it results in the lights flashing. The person had taken it into their dealer, and GM was/is supposedly working on a fix for it. You might try going to your dealer and seeing about the fix as well...

carlosh · May 4, 2019

Tanks. Will take it in for sure.

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carlosh · May 5, 2019

I read some posts on a forum (I follow a number, so I'm not sure where), that it's a security thing, where the truck is continuously testing that the trailer is still connected, but it results in the lights flashing. The person had taken it into their dealer, and GM was/is supposedly working on a fix for it. You might try going to your dealer and seeing about the fix as well...

Btw what other forums do you follow?

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davester · May 5, 2019

For my gm truck, I also read these: dieselplace.com, silveradosierra.com

carlosh · May 5, 2019

For my gm truck, I also read these: dieselplace.com, silveradosierra.com

Tanks!

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UGADawgs · May 6, 2019

Another thread a few posts down this page

carlosh · May 6, 2019

Link did not like me

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UGADawgs · May 6, 2019

Maybe Tapatalk issue, works for me. Same page, a few threads down...

Edited May 6, 2019 by UGADawgs

carlosh · May 6, 2019

Maybe Tapatalk issue, works for me. Same form, a few threads down...

Rgr. I'll search again to see if I can find. No joy before

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Opiedeegs · May 6, 2019

Trailer lights flash
https://r.tapatalk.com/shareLink?share_fid=33003&share_tid=223335&share_pid=2247624&url=https%3A%2F%2Fwww%2Egm-trucks%2Ecom%2Fforums%2Findex%2Ephp%3F%2Ftopic%2F223335-Trailer-lights-flash%2Fpage__view__findpost__p__2247624&share_type=t

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davester · May 6, 2019

link worked for me:

https://www.gm-trucks.com/forums/topic/223335-trailer-lights-flash/

Jack D · May 19, 2019

On 5/4/2019 at 4:58 PM, carlosh said:

Attached the boat to the truck for the first time today. After a minute and 10 seconds the lights on the trailer flicker/flash. The lights on the truck did not and are not flashing.

I do have the trailering package if that matters any too.

Video was taken this morning.

Anyone run into this?

https://cloud.tapatalk.com/s/5ccdfc802c694/20190504_060215.mp4

Sent from my SM-G965U using Tapatalk

As stated by others, that's the trailer security system. Save yourself some headaches by reading the trailering section of your manual. You also need to change alert settings when towing. Also, be sure to have your truck lights turned on before unplugging your trailer's wire from the truck.