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trailer brake light

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Old Mar 15, 2024 | 04:55 PM
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Default trailer brake light

i have a 2013 gmc sierra with a service trailer brake light that comes on at start up.i have replaced the dash switch, the module under truck n had it programmed, light still comes on , now 700.00 dollars later i'm lost, any help?
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Old Mar 16, 2024 | 02:00 AM
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Default

Check for stored codes.

Check wiring at the brake controller module.

Check the trailer connector(*) for corrosion etc.

Check trailer wiring (in the truck) for damage.
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