Problem with my 2001 Chevrolet Malibu.
V6 3400
dash lights = security theft light
Repair work done prior = Replaced the ignition cylinder because the key would not turn, and
now it wont start.

Question = Why does my chevy malibu not start after changing the passlock cylinder. The key would
not turn so my husband replaced the cylinder. The theft security light will come the dash. I have seen
on other sites that there is a re-learn code procedure to get it to start. How do i fix this problem. Are
there any other parts involved, or just a code relearn.

Answer:
Here is the
relearn steps you needed.

Passlock ignition cylinder.  The relearn procedure you are referring to is a temporary fix. This will
usually get your car to start again, but eventually will fail to start again.  Replacement of the cylinder is
required.

Here is that procedure.

Keep a battery charger on.

1. Turn the key ON.
2.Wait for 10 minutes or until the theft / security light goes out.
3.Turn key off for 10 seconds.
4. Start the car. Learn is complete
after that and car still wont start.
Comments
thank you very much!  Just paid money for gaskets and they did my fuel injection
(ouch).  A week later the car won't start.  After days of reading and thinking I was
going to have to replace fuel pump, fuel filter, etc.  I read this article and tried it.  It
worked for me!! I wonder if a shop would have tried this before they replaced very
thing and charged me for the repairs.  That scares me more than anything!
I had the key switch replaced a year ago. I noticed last week that the anti theft light
came on.  Now the car will not start and acts like it is out of gas.  I know the fuel
pump is working and I have good fire. This is a 2001 malibu do you have any
suggestions?
I'd try doing the theft relearn procedure listed on this
website, but that is just a temporary fix. You have
probably set a theft deterrent code and most likely will
need a new ignition cylinder. Once replaced, and
relearned, your problem should be fixed.
Ok I had a 2002 Malibu and had this same problem turn the key on for ten minutes
or tell the theft light stops blinking then shut the key off and them start the car it
works... Worked every time on mine.
Yes, same problem here with my 2000 Malibu; now I know the temporary fix. I've
not replaced any parts or such, so not sure how this non-start problem developed.
Needed new battery anyway, so that's not the issue. Any ideas? Will check back
here soon...
Se this link for Passlock Sensor Replacement.

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Chevy Malibu Theft Learn


2004 Chevy Malibu  Security light on.
We changed ignition switch , change key cylinder with chip, and body module.
Question = Done all the above, even the passkey cycling method and car still starts
and stalls.

Answer:
Assuming you did a theft relearn after replacing the ignition switch and Passlock
cylinder- but that did not work, then you replaced the BCM, we need to know if you
programmed the BCM for your car? If you did, did you then do the relearn again? If
not, this is your problem.

If all this was done properly, then you must have a wiring problem between the
cylinder and BCM. Also, if the car has a non-factory alarm or remote start, you need
to get that out of the system, as these are known to cause problems with the factory
security system.