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RIP
RIP, Lead Technician
Category: Car
Satisfied Customers: 5591
Experience:  A.S.E. Master Technician, Advanced Level, Smog - European, Domestic, & Asian -- Car Category Mentor
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2001 Sonoma: security light has been starting to come..last 4 mornings

Resolved Question:

2001 Sonoma truck, the security light has been starting to come while driving, the last 4 mornings the truck turns over fine but does not start, any ideas ?
Submitted: 8 years ago.
Category: Car
Expert:  RIP replied 8 years ago.

Hi, welcome to Just Answer

This is a common problem with the Passlock Security system. It may be a defective sensor in the steering column, but more commonly it is just a programing issue. The next time it occurs, when the engine is not firing, try the 30 minute procedure below. You may need to try it a couple of times if it doesn't do the trick the first time through. And if the problem continues, the Passlock System will need a scan with factory level equipment to determine a sensor failure.

30 Minute Learn Procedure
Notes
  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). 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.
  6. Start the engine (the vehicle has now learned the Passlock(TM) Sensor Data Code and/or password).
  7. With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).

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