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 1420 (THEFT DETERRENT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2955: SECURITY SYSTEM SENSOR DATA CIRCUITDIAGNOSTIC AIDS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Diagnostic Aids
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Use the scan tool in order to inspect the Passlock data voltage and the Passlock code.
- Inspect the Passlock sensor harness at the Passlock sensor and the lower steering column connector for an intermittent, short to ground or short to battery. Refer toTesting for Intermittent Conditions and Poor Connections in Wiring Systems.
- Following a repair the tamper timer may need 10 minutes in order to expire.
- You may be directed to this table from the VTD Diagnostic System Check without a DTC B2955 being set. If you were directed to this table, follow all of the steps in this diagnostic table.
- When directed to this table DTC B2955 may have a history status.
- The VTD internal diagnostics are not run while the tamper timer is active.
- Prior to replacing a BCM, ensure that all of the diagnostics have been completed. Refer to diagnostic trouble code list.
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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.