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Service Trailer Brake and No Power to Brakes on 2015 GMC Sierra 1500


i have a 2015 Gmc Sierra with factory installed controller when i hooked up my trailer i have everything but brakes it says service trailer brake system


Expert Reply:

The first thing to do is check your Sierra's trailer connector for corrosion and clean it if possible or replace it with the 7- and 4-Pole Trailer Connector Socket # HM40975.

That message will otherwise mean an issue with what I assume is your factory brake controller, as that is often the case so you may have to take your 2015 GMC in to have it serviced if you can't find an issue with the connector. You are also much better off with the far more reliable and better performing aftermarket brake controllers like the Brake EVN # TK63VR and Wiring Adapter # 3016.

I strongly recommend upgrading and have added links to video reviews for you as well.

expert reply by:
Kyle S

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