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.
2003 Hummer H2FACTORY OEM SERVICE PROCEDURE
Transfer Case (BW 4484) DTCS
TRANSFER CASE (BW 4484) AIR BAG DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0790 | Neutral Indicator Control Circuit Voltage |
| DTC B2725 | Switch Signal Circuit Voltage |
| DTC C0306 | Motor Circuit Voltage |
| DTC C0327 | Encoder Channel Voltage |
| DTC C0329 | Encoder Channel Voltage |
| DTC C0359 | 4WD LO Circuit |
| DTC C0550 | EEPROM/Checksum Failure |
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.