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 136 (ENGINE CONTROLS - REMOVAL, OVERHAUL & INSTALLATION - EXCEPT DIESEL)COMPUTERIZED ENGINE CONTROLSPOWERTRAIN CONTROL MODULEREMOVAL
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Powertrain Control Module: Removal
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure ignition is off. Disconnect negative battery cable. Locate PCM at left front corner of engine compartment. See Fig 1. Remove harness ground from the clip attached to the PCM cover (if equipped).
- Release PCM cover from mounting tabs on PCM bracket. Remove PCM cover from PCM. Loosen PCM harness connector bolts. See Fig 2. Disconnect PCM harness connectors. Release the PCM spring latch. Remove PCM.
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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.