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 266 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC U1500: ONSTAR® (GENERATION F1) VEHICLE COMMUNICATION INTERFACE MODULE INTERNAL MALFUNCTIONCODE ENABLE CRITERIA
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Code Enable Criteria
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Code Enable Criteria
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
VCIM microprocessor runs diagnostic program to detect an internal fault during module power up, and every ten seconds, until module re-enters sleep mode.
RENDER: 1.0x
NO RELATED
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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.