Car Alarms: Reset Security Alarm in 2005 Sunfire, digital odometer, gm vehicle

Question
I just changed the battery in my 2005 Sunfire.  The car turns-over, but it won't fire.  I have a digital odometer that now reads "error".  The anti-theft system has locked my radio.  The fob won't unlock the doors.  I have been told that my security system needs to be reset.  Is this something I can simply do at home, or do I have to take it to the dealership?

Answer
This vehicle has a the PASSLOCK II key based
engine disabling system, and from the description,
it appears you've reset the VATS somehow.

This is a problem that won't just
go away either. It needs to be addressed soon.

The car does not recognise the chip in the ignition
key when that happens. When removing the power,
you inadvertently wiped the memory as well.

You can try to put the key
in the ignition, turn to the on position & wait at
least 10 mins like that when it happens, and that
MIGHT work. But after awhile, it will stop working at all.
Your ignition switch VATS reader assembly may be to blame.

In some cases, the VATS (GM'S VEHICLE ANTI THEFT SYSTEM)
will re learn the code this way, and will then
allow the restart all the time. But if this does not work,
then go to any GM vehicle dealer to have the service department
evaluate the issue, & re code it.

Good luck I hope method 1 does the trick!

You can do a permanant bypass on this system.
see the PLJX bypass kit at www.PASSLOCK2.com

Let me know what your solution was.

ALARMTEK
caralarmman.com