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.
2004 Hummer H2 4D Utility PickupFACTORY OEM SERVICE PROCEDURE
HVAC, Automatic DTCS
HVAC AUTOMATIC DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0159 | Outside Air Temperature Sensor Circuit Range/Performance |
| DTC B0164 | Passenger Compartment Temperature Sensor #1 (Single Sensor or LH) Circuit Range/Performance |
| DTC B0174, B0179, B0510, or B0515 | Discharge Air Temperature Sensor Circuit |
| DTC B0183 or B0188 | Sunload Sensor Circuit |
| DTC B0229, B0414, B0424, or B3770 | HVAC Door Actuator Range/Performance |
| DTC B0263, B0268, B0408, or B0418 | HVAC Door Actuator Circuit |
| DTC B1375 | Device Ignition 3 (ON) Circuit |
| DTC P0530 | Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit |
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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