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Trailer lights flash

Kevin0311
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EastTexan Enthusiast

EastTexan

Posted
Posted

Seems like on my 2020 Sierra 2500HD awhile back when any of my three trailers were plugged in and the truck was turned off the trailer lights would only flash every 30 seconds or so? Lately it's almost a constant flicker with any of the trailers.

  • 1 year later...
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Cole_dog
Cole_dog

I read the link. I would think it could check without flashing the lights on my boat all night long in a motel parking lot. If there is no fix, that’s got to be the dumbest thing I’ve ever heard of. 

OnTheReel
OnTheReel

Actually a feature, not an issue. It’s a part of the trailer anti-theft system. It pulses the trailer lights to check for load. The idea is if someone unhooks your trailer, it’ll notice the lack of cu

crankman
crankman

Interesting mine only flash if i hit the FOB to lock the truck. Why would you want your trailer lights flashing all the time day or night while it parked. Don't sound right.

demj1308 New Member

demj1308

Posted
Posted

I get the flashing lights for security, but mine flicker irregularly and every second or two, almost like morse code. A few posts i read said they were getting a flash every 10 seconds.

  • 8 months later...
tex Enthusiast

tex

Posted
Posted
On 6/26/2023 at 9:21 AM, MrMagloo said:

Same here.  Appears to be the Trailer Connector security feature.

I dont like the flickering but this says we can at least set it to one blink every 42 seconds instead of the constant light show!

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

 

  • 5 months later...
Dragon rider New Member

Dragon rider

Posted
Posted
On 5/2/2019 at 8:14 AM, Rsktm300xcw said:

That link is very informative and would have been very helpful to me about a month ago. I through a ton of trial and error figured out that my trailer lights need to have just the right amount of load for everything to work correctly. A little tip, if you have LED lights and are seeing error being detected by your trailer light test adding a resistor to the circuit fixed my brake light problem. On my running lights circuit my trailer had 17 incandescent lights and they would all turn on for 1 second and then turn off every time I tried them. The trailer test showed a running light problem. I swapped all 17 out for LEDs to reduce the load and that seems to have solved my problem. So it is very important to reach the right  balance for the trailer light control module to see enough load to know that the light is working but not to overload so the module shuts the circuit off. Can be tricky. There is also an update out to "reflash" the module. I dont remember the number but it listed near the end of the cold weather electrical problem thread. My local dealer did the update as well. So far dont seem to have problems. Waiting for first long trip with the trailer to see if it is all solved.

What circut did you add the resistor, and what resistor rating did you use? THanks!

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