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2008 2500HD Service Trailer Brake System

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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. 

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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

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