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there is likely a wire that goes from your brake pedal switch to the trailer brake controller this wire is probably broken or not hooked up. if it is hooked up and no wires are broken I would start making sure everything is hooked up right.
TBC means Trailer Brake Controller fault.Check for moisture/water in the trailer plug connector at the back of your truck. Water/moisture will cause TBC error codes. Look for moisture at all connections to the plug and inside the plug.Trailer brake controller that is built into your dash. If you are hooked up to a trailer it could mean you are losing your connection or ground to the trailer. If you are not connected to a trailer it means there is a problem with your brake controller possibly a short in the wiring caising the fault code.-----It means either A) you have a bad ground on your trailer. Or B) your cable on your trailer is too short and causing it to pull out of the plug or C) you have a short in the factory trailer harness wiring or the plug is gunked up.---------get this possibilities checked.It will help.Thanks.Helpmech.
with a trailer on that has eletric brakes, while pulling the trailer activate the brake controller and adjust it till the tire dont lock up but remember that as the weight goes up you will need to increase the the setting on the brake controller
Is this wire a ground wire from the trailer or is this a wire for the trailer? If you are wiring a hook up for your trailer to plug into, that should be a ground wire and can be hooked up to any good solid metal part of the car. This can ground to the body, chassis or bumper. If you are looking for a wire to hook to, then look at your tail light socket and see which wire goes to the metal base of the bulb, that is the ground wire.
Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.
If your signals & brakes are on 2 different circuits, ( for example a red lens for stop & an Amber for turn.) then you'll need to buy a converter that goes between vehicle & trailer. They're not too expensive at any trailer or RV place. I think some of the autoparts stores stock them now too.