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 942 (TRANSFER CASE (NVG126-NP4))REPAIR INSTRUCTIONSTRANSFER CASE CONTROL MODULE REPROGRAMMINGPROGRAMMING USING SCAN TOOL PASS-THROUGH CONNECTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Programming Using Scan Tool Pass-Through Connection
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Programming Using Scan Tool Pass-Through Connection
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the scan tool to vehicle and power it up.
- Connect the computer station to the scan tool.
- Select "PC Using Scan Tool Connection" from the programming menu on the computer station.
- Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are reprogramming or replacing the Electronic Control Unit (ECU).
- Select "vehicle" from the selection menu.
- Select the module you wish to Program/Reprogram.
- Select "Normal" for Programming Type.
- Select the applicable software calibrations.
- Transfer data file to the scan tool.
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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.