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
HVAC, Automatic DTCS
HVAC - AUTOMATIC AIR BAG DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0159 | Ambient Air Temperature Sensor Voltage |
| DTC B0164 | Inside Air Temperature Sensor Voltage |
| DTC B0174, B0179, B0510, or B0515 | Air Temperature Parameter |
| DTC B0183 or B0188 | Sunload Sensor Signal Value |
| DTC B0229, B0414, B0424, or B3770 | Actual Door Position Value Or Actuator Fails Calibration |
| DTC B0263, B0268, B0408, or B0418 | Actual Door Position |
| DTC B1375 | Ignition 3 Voltage Input |
| DTC P0530 | A/C Refrigerant Pressure Sensor Signal Voltage |
Factory Service Tools
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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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