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.
Circuit/System Description
The User Gain Switch consists of 2 control buttons: Gain Up, and Gain Down. The output signal from the trailer brake controller switch is connected, and monitored by trailer brake control module (TBCM).
The TBCM monitors the circuit fault for User Gain Switch input for faults that includes short to GND, short to battery, and open circuit. This DTC will also be reported when fault is detected in TBCM ground circuit.
The TBCM also monitors the input signal validity from the User Gain Switch.
NO RELATED
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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.