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.
Self-Diagnostic System: Notes
Truck Body Control (TBC) module is equipped with a self-diagnostic system, which detects system Diagnostic Trouble Codes (DTCs) or abnormalities. When a malfunction occurs, TBC will store a DTC. See TBC MODULE DTC DEFINITIONS . Malfunctions are recorded as history/intermittent failures or as current failures.
Current DTCs indicate TBC module has detected a fault which is currently present. A history DTC indicates that TBC module has previously detected a malfunction that is not currently present.
A scan tool must be used to retrieve and clear DTCs. The scan tool also has several features that can be used to help locate an intermittent condition.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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