Service Trailer Break System message on dash display
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Joined: Nov 2025
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Service Trailer Break System message on dash display
I need help. I'm getting service trailer break system on my 2012 GMC Sierra 2500 HD. I have replaced the computer and relay above the spare tire. I have checked all my fuses for the trailer. I have changed the gain trailer switch on the dash. I am at wits end on this. Your help will be much appreciated.
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