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.
Transfer Case Shift Control Module
The transfer case shift control module has been standardized for all K trucks. The transfer case shift control module contains the same hardware, boot software, and operational software found in other GM K trucks. The only difference is the calibration file downloaded into the transfer case shift control module memory. The transfer case shift control module comes with the appropriate calibrations out of the factory, but new calibrations must be flashed into the transfer case shift control module during service. This is especially important if a new transfer case shift control module is installed during service. Calibration files may be introduced irregularly. See your technical service bulletins.
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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.