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 15 (BODY CONTROL MODULES)REMOVAL & INSTALLATIONPOWERTRAIN CONTROL MODULEREMOVAL & INSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Removal & Installation
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal & Installation
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Use correct fastener in correct location. Replacement fasteners must be correct part number for application. Fasteners requiring replacement or fasteners requiring use of thread locking compound or sealant are identified in service procedures. DO NOT use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage fastener. Use correct tightening sequence and specifications when installing fasteners in order to avoid damage to part and systems.
- Disconnect negative battery. Disconnect Intake Air Temperature (IAT) sensor electrical connector. Remove 3 bolts from inner fender brace and remove brace.
- Loosen clamp securing air intake duct to air cleaner housing. Carefully remove air intake duct from throttle body and air cleaner housing. Remove 2 screws from 2 air cleaner housing sections.
- Remove air cleaner housing cover assembly. Without disconnecting PCM connectors, remove PCM and harness from PCM housing. Disconnect PCM connectors.
- To install, reverse removal procedure. Replacement PCM will not allow secondary air pump operation until a total of 10 miles (16 km) have been accumulated. New PCM must be programmed. See POWERTRAIN CONTROL MODULE under PROGRAMMING.
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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.