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.
2009 Hummer H3 Base, StandardFACTORY OEM SERVICE PROCEDURE
Transfer Case
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Transfer Case
- DTC B0790
- DTC B2725
- DTC C0306
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Testing
- Component Testing
- Repair Procedures
- DTC C0327
- DTC C0329
- DTC C0359
- DTC C0550
- Symptoms - Transfer Case
- Transfer Case Shift Control Switch Inoperative
- Transfer Case Shift Control Switch Indicator Always On - Two or More
- Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode
- Transfer Case Shift Control Switch Indicator Inoperative - One or More
- Service Indicator Always On
- Service Indicator Inoperative
- Transfer Case Popping Noise
- Transfer Case Whine or Rumble Noise
- Transfer Case Growl or Grinding Noise
- Transfer Case Clunk in 4HI Lock
- Transfer Case Clunk in 4LO Lock
- Transfer Case Clunk During Acceleration and Deceleration
- Transfer Case Shudder or Binding
- Transfer Case Will Not Shift
- Transfer Case Jumps Out of Gear
- Transfer Case Leak Diagnosis
- Repair Instructions - On Vehicle
- Transfer Case Shift Control Module Replacement
- Transfer Case Shield Replacement
- Transfer Case Fluid Replacement
- Transfer Case Motor/Encoder Replacement
- Transfer Case Speed Sensor Replacement
- Front Output Shaft Seal Replacement
- Rear Output Shaft Seal Replacement
- Transfer Case Assembly Replacement
- Input Shaft Seal Replacement
- Transfer Case Adapter Replacement
- Transfer Case Shift Control Switch Replacement
- Repair Instructions - Off Vehicle
- Description and Operation
- Special Tools and Equipment
Factory Service Tools
Use the Manual With the Right Hardware
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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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