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 231 (BODY CONTROL MODULES)PROGRAMMINGTHEFT DETERRENT MODULE10-MINUTE RELEARN PROCEDURE
2002 Chevrolet Avalanche 2500, RWD
10-Minute Relearn Procedure
2002 Chevrolet Avalanche 2500, RWDSECTION 10-Minute Relearn Procedure
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.
NOTE:
Use this procedure after replacing Passkey® III ignition keys, TDC module or PCM.
- Connect scan tool to Data Link Connector (DLC). DLC is located below driver side of instrument panel, near steering column.
- Turn ignition switch to RUN position.
- Ensure all power consuming devices are turned off.
- Using scan tool, select REQUEST INFO under service programming system and follow scan tool instructions.
- Disconnect scan tool from vehicle, and connect scan tool to a Techline terminal with latest service programming system software.
- Using Techline terminal, select SERVICE PROGRAMMING SYSTEM, and follow Techline terminal instructions.
- Disconnect scan tool from Techline terminal, and connect to DLC.
- Using master Passkey® III ignition key, turn ignition switch to RUN position.
- Using scan tool, select PROGRAM ECU under service programming system.
- Ensure scan tool stays connected to vehicle for 10 minutes.
- Observe scan tool after 10 minutes. Scan tool will display PROGRAMMING SUCCESSFUL, TURN OFF IGNITION. Vehicle is now ready to relearn key information and/or passwords on next ignition switch cycle from OFF to RUN positions.
- Turn ignition switch to OFF position, and wait 5 seconds.
- Using master Passkey® III ignition key, start vehicle. Theft deterrent control module has now learned key transponder information, and PCM has now learned fuel continue password.
- Using scan tool, clear all DTCs.
NOTE:
On some vehicles, SECURITY indicator may illuminate on steady for duration of 10-minute relearn procedure.
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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.