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ttiger79, Auto Mechanic
Category: Chevy
Satisfied Customers: 1257
Experience:  ASE Master Certified, Advanced Engine Performance
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My 2003 Chevy Suburban wont start. This same ...

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My 2003 Chevy Suburban won't start. This same thing happened two weeks ago, had to have it towed and the computer reset. Same thing has happened again. What do I do?
What part of the computer did they reset the last time this happened? Was it a problem with the security system/ factory antitheft?
Customer: replied 10 years ago.
Reply to ttiger79's Post: yes, they said it was the anti theft
Sounds like you have a bad antitheft control module. This module is "forgetting" the code in your key, and is always needing reprogramming. This module should not have to ever be reprogrammed unless the module goes bad.

The only way the module can be reprogrammed is by using a dealership scan tool.

You can try this relearn procedure that you don't need a scan tool for. It will take about 30 minutes:

1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON, vehicle will not start.
3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds .
5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes , the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
6. Start the engine. The vehicle has now learned the Passlock(TM) Sensor Data Code and/or password. IMPORTANT: The vehicle learns the Passlock(TM) Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.

Let me know if you need any more help!

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