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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1841 (DTC INDEX)HVAC, AUTOMATIC DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
HVAC, Automatic DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION HVAC, Automatic DTCS
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
AUTOMATIC HVAC DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0159 | Signal Circuit Voltage Out Of Range |
| DTC B0164 | Signal Circuit Voltage Out Of Range |
| DTC B0174 | Signal Circuit Voltage Out Of Range |
| DTC B0179 | Signal Circuit Voltage Out Of Range |
| DTC B0184 | Signal Circuit Voltage Out Of Range |
| DTC B0229 | Recirculation Actuators Travel Range |
| DTC B0248 | Mode Door Position Error |
| DTC B0268 | Recirculation Door Position Error |
| DTC B0408 | Air Mix Door Position Error |
| DTC B0414 | Air Temperature Door/Actuator |
| DTC B3761 | Mode Door/Actuator Error |
RENDER: 1.0x
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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.