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 20 (THEFT DETERRENT SYSTEM)DIAGNOSTIC TESTSDTC B3033: SYSTEM INDICATES TAMPERTESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
DTC B3033: System Indicates Tamper: Testing
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Testing
WARNING: This page is about a different car, the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- If theft deterrent diagnostic system check has been performed, go to next step. If theft deterrent diagnostic system check has not been performed, go to THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK .
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Momentarily turn ignition switch to CRANK position, not letting engine start, release ignition switch to RUN position. Select scan tool Passlock(tm) module display DTCs function. If scan tool displays DTC B3033 as a current DTC, go to next step. If scan tool does not display DTC B3033 as a current DTC, go to DIAGNOSTIC AIDS .
- Inspect area around ignition lock cylinder for any device which could create a magnetic field (audio speaker, magnet, etc). If a magnetic device is near the ignition lock cylinder, go to next step. If no magnetic device is near ignition lock cylinder, go to step 5 .
- Remove any device which may be creating a magnetic force. After repair, go to step 8 .
- Check Passlock(tm) sensor connector for intermittent or poor terminal contact. If terminal contact is okay, go to next step. If terminal contact is not okay, repair as necessary. After repair, go to step 8 .
- Replace Passlock(tm) sensor. After repair, go to next step.
- Perform PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS . After programming, go to next step.
- Using scan tool, clear DTCs. Turn ignition switch to OFF position. Momentarily turn ignition switch to CRANK position, not letting engine start, then release to RUN position. Select Passlock(tm) module DISPLAY DTC function. If DTC B3033 does not reset, system is okay at this time. If DTC B3033 resets, go to step 3 .
NOTE:
A wait of up to 10 minutes may be needed in order to reset the theft deterrent module and synchronize all Passlock(tm) components.
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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.