PASS LOCK ON 1999 PONTIAC SUNFIRE

Very common. Diagnose and usually have to replace the lock cylinder case. Read this post on Passlock failures
Passlock fixes Ricks Free Auto Repair Advice

By-pass the anti-theft . Videos on youtube showing how too . How to troubleshoot bypass GM VATS Passlock Passkey System

Anti-theft system isn't allowing it too .
The Passlock™ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock™ System are as follows:
• The ignition lock cylinder and key
• The ignition lock cylinder case, including the Passlock™ sensor
• The ignition switch
• The body control module (BCM)
• The security indicator on the instrument cluster
• The powertrain control module (PCM)

Pontiac Sunfire Questions - car won't start - CarGurus

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CarGurusAug 16, 2011 - car won't start - replaced ignition lock on 2002 pontiac sunfire antitheft light is ... system goes into fail safe mode and you won't have any more problems. ...lock cylinder on 2003 pontiac sunfire....when new lock cylinder was ...

Security light lit on the instrument cluster ? It should have anti-theft system . No , can't just remove it . It has componets - key lock cylinder housing , software programmed into control modules etc... If you just removed or disconnected the pass lock sensor the pcm -engine computer would not see a coded message ,so it would disable fuel injectors an maybe starter . Your best bet ,have a qualified repair shop diagnose it .

Is the security light lit on the instrument cluster ? The vehicle has spark ? Does it have fuel pressure ? Did you check with a fuel pressure gauge ? The passlock anti-theft system use's a sensor in the ignition lock assembly .
The Passlock™ lock cylinder is a locking cylinder that turns a rotating magnet past a stationary hall effect sensor. The rotating magnet creates a resistance code (R-Code) that the cylinder sends to the instrument cluster. The Passlock™ lock cylinder interfaces with the instrument cluster through a 3 wire connection. The 3 wires have the following functions:
Plus software programmed into the instrument cluster and PCM/ECM engine computer .
There is nothing you can do if the anti-theft system is not working , taking out parts won't do any thing , the software in the computers still won't let it start . Your best bet ,take it to a GM dealer .

Here's a link that will help you out. This is a pretty common and expensive problem in GM vehicles.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Usually this is a problem with the passlock sensor which is part of teh ignition key cylinder. The ignition cylinder will have to be replaced the initialized before the car will start

there is nothing special about your keys , no transponder . Has a hall effect sensor that is part of the ignition lock cylinder housing . You could get a key made at hardware store . woludn't make a difference .
The Passlock™ lock cylinder is a locking cylinder that turns a rotating magnet past a stationary hall effect sensor. The rotating magnet creates a resistance code (R-Code) that the cylinder sends to the instrument cluster. The Passlock™ lock cylinder interfaces with the instrument cluster through a 3 wire connection. The 3 wires have the following functions:
• Power
• Ground
• Data

Is the security light lit on the insturment cluster ? Does the vehicle start an run ?

my 1999 pontiac sunfire drivers door latch is broke can not close the door. i have it pulled shut? how much will a used latch cost, or even 3 bolts for it? all the auto stores/ jumk yards are closed for me to call