Why do '04 Pontiac Grand Ams don't start all of a sudden?

Question

Twice now, all of a sudden my car decided not to start after running perfectly fine before. I found a method, here on yahoo answers, that allows my car to start working again

Attempt to start the car by turning the key to the Start/Run Position.

Observe that the vehicle fails to start and that the security light is illuminated.

Release key to the 'ON/Accessory' Position. (DO NOT turn key to the 'off' position.)

Allow the vehicle to sit with the key in the 'ON/Accessory' Position for no less than 11 minutes.

Turn key to off position and allow the vehicle to remain in the 'OFF' position for no less than 30 seconds.

Repeat #1 - #5 for 3 cycles.

On 4th attempt, car should start.

NOTE : Since this is a fairly long procedure, I would limit all electrical sources, such as disconnecting headlights, to prevent discharge of battery.

NOTE 2 : It is SAFE to wait LONGER than the allotted time, but it is not safe to wait less time. I.e. 12 minutes instead of 11 minutes should be safe; however, waiting 10 minutes instead of 11 minutes is not safe.

Properly executed, this procedure should take approximately 35 minutes to complete

Why does my car do this, and why does this method work?

Answer 1

Sounds like you have a problem with your pass-lock system or security system. The powertrain control module thinks the vehicle is being stolen and does not recognize the security code as you rotate the key in the ignition.The pass-lock module is mounted on the ignition switch.Go to Auto Zone and borrow their OBD2 scanner,you'll probably find some diagnostic codes that start with P16## pass-lock code invalid.I recommend a GM dealership for this type of repair.Very common problem in this type of security system.

Answer 2

I believe the problem is the chip in the key is bad and you need to get a new key

Answer 3

the car has pass key 3 systen, the chip is in the ign cylinder! you should have the key and cylinder replace, the systen is just starting to brake down! it will get wors! the reason the car starts after the key is in the acc, for more then ten mins is because the car is relearing the key !