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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 15 (BODY CONTROL MODULES)PROGRAMMINGPASSLOCK™ SYSTEMWITHOUT SCAN TOOL
2002 Chevrolet Avalanche 2500, RWD
Without Scan Tool
2002 Chevrolet Avalanche 2500, RWDSECTION Without Scan Tool
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.
- Turn ignition switch to RUN position. Attempt to start engine and release key to RUN position, vehicle will not start.
- Observe SECURITY indicator, after about 10 minutes, indicator will turn OFF. Turn ignition switch to OFF position, and wait 5 seconds.
- Repeat steps 1 and 2 two more times for a total of 3, 30 minute, cycles. Vehicle is now ready to relearn Passlock™ sensor data code and/or passwords on next ignition switch transition from OFF to CRANK position.
- Start engine. Vehicle has now learned Passlock™ sensor data code and/or password. Using scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.
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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.