Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Trailer Brake Controller System
The trailer brake controller system consists of the following components:
- Trailer brake control (TBC) module
- manual slider switch
- gain switches
- light emitting diode (LED) display
- Brake pressure transducer
- Circuitry
- Seven-pin connector
The trailer connectivity status, gain setting and relative trailer braking power during a braking event are provided to the driver through the LED display in the TBC module.
The brake pressure transducer is part of the master cylinder assembly. Refer to HYDRAULIC BRAKE ACTUATION article.
The TBC module is normally a factory installed item but it can be dealer installed. If the module is dealer installed, a new master cylinder with a brake pressure transducer must also be installed and the instrument cluster must be reconfigured to communicate with the TBC module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.