Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
The issue is on the truck from these tests you have done. Here is what turns on this warning.
Check Trailer Wiring
This message will be displayed if:
Here is how to diagnose this https://dl.dropboxusercontent.com/u/90220402/brakecontrol.pdf
When it is not the trailer to blame I normally find the module to blame or the wires and pins connection on the trucks 7 pin connector to blame.
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Hello again Chris here,