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Posted (edited)

I pulled three different trailers last weekend with no problem.  After I have unhooked from them I am getting a message that a trailer is still attached and to check the brake and turn signal bulbs on the trailer.  Nothing is hooked to truck.  Has anyone had a problem like this and found a cure?  I have checked the fuses and they are all good for the trailer turn and brake lights.  HELP!!!!!  

Edited by Camoman
mispell
Posted
21 hours ago, Camoman said:

I pulled three different trailers last weekend with no problem.  After I have unhooked from them I am getting a message that a trailer is still attached and to check the brake and turn signal bulbs on the trailer.  Nothing is hooked to truck.  Has anyone had a problem like this and found a cure?  I have checked the fuses and they are all good for the trailer turn and brake lights.  HELP!!!!!  

Does it still do that after you shut down the truck and restart?  Our trucks do strange things if you plug in or disconnect a trailer while they are running or still powered.

Posted
Does it still do that after you shut down the truck and restart?  Our trucks do strange things if you plug in or disconnect a trailer while they are running or still powered.

Its been doing it for a week now I even hooded up again to undo it under power and without power makes no difference.


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Posted

Well for what its worth carried it to dealer they found two fuses blown under hood.  #63 trailer battery fuse and #82 TIM fuse.  Never thought to check these. Message was saying lighting circuit wasn't working...Oh well good to go now.

Posted (edited)

What year is your truck? I have a 2021 HD and am having similar issues. Every time I start the truck it gives me messages on the information center about trailer light errors and thinks a trailer is attached. I took it to the dealer and they said there is not a fix for it yet. I contacted GM directly and they also said they don’t know how to fix it. My truck only has 500 miles and has never had a trailer attached as of yet. 

Edited by Dmaxdude
Correction

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