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2008 2500HD Service Trailer Brake System

Lewcul

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Lewcul New Member

Lewcul

Posted
Posted

The Service Trailer Brake System light is coming on at random times. The trailer does not have to be attached. It happens when I take my foot off the brake pedal and resets when I restart the engine. I have replaced the module near the spare tire, the controller on the dash and the sensor at the master brake cylinder. I don’t know what else to do. 

Hillwood Enthusiast

Hillwood

Posted
Posted

You should start with pulling chassis codes to get a definite failure.
Check the trailer connector, if there is any corrosion replace it. The plugin at the connector also if there is any corrosion.
A new module would have to be programmed to work.
I have seen a lot of relays fail. If you want to just try parts.

Sent from my SM-G965U using Tapatalk

Formulabruce Enthusiast

Formulabruce

Posted
Posted

Had this problem on a buddies 2009, it ended up being the multi purpose Brake switch ( brake lights, shuts off cruise and trailer brake lights) at the pedal..

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