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.
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HOMESERVICE MANUALSGMC2009SIERRA 2500 HD, 2D PICKUP, 6.0 K, 4WD, PART TIMEREPAIR AND DIAGNOSISTRANSMISSIONTRANSFER CASETRANSFER CASE - MP 1625/1626-NQFDIAGNOSTIC INFORMATION AND PROCEDURESTRANSFER CASE SHIFT CONTROL SWITCH INOPERATIVECIRCUIT/SYSTEM TESTING
2009 GMC Sierra 2500 HD, 2D Pickup, 6.0 K, 4WD, Part Time
Circuit/System Testing
2009 GMC Sierra 2500 HD, 2D Pickup, 6.0 K, 4WD, Part TimeSECTION Circuit/System Testing
- Review the scan tool data list mode switch selected and select difference mode with the transfer case shift control switch. Does the mode switch selected parameter on the scan tool change as you change modes on the switch?
- If the modes change according to the scan tool replace the transfer case control module, reprogram, complete the motor learn procedure. If the modes on the scan tool do not change replace the switch.
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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.