This truck is equipted with a P.A.T.S Anti-theft system from the factory. you notice the little black "chip" at the end of the key.
This chip has to be programed with the code that is in your ecm.
your local dealership can do this. Uses of a non-coded key will eventually not start the truck. When this happens put the key in and turn the ignition on and leave the door open after 15 to 20 minutes the truck should start. The best way to avoid this is to have the dealership make the keys to the vin number of the vehicle.
Hopes this helpes.
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you damaged the ignition switch and it will not recognize key you have to replace the tumbler and ignition switch the key acts like an electronic switch in most modern vehicles put key in and its recolonized and will turn and start vehicle ---damage to key or tumbler sets off anti theft and you have no start ---in future dont try to hot wire or pop ignition when keys are lost (thats all hollywood) go to dealer with vin and proof of ownership and they can cut you a new key
Have a 98 would crank and run for a second.the problem was security.the ignition switch housing and module was faulty and causing the anti theft to shut off the injectors. look at that and your headlamp fuses as well as anti theft is tied to headlamp fuse
The late-90's GM Passlock system (e.g. 1997 Malibu, Regal, Impala, etc.) has a part around the ignition tumbler that goes bad and no longer reliably detects the valid key. In that situation, the "Theft System" light will slowly flash and the carburetor is cut off so the engine won't start. The time-out on the system is 10 minutes - you don't have to do anything, you don't have to disconnect the battery, the key can be out of the ignition -- it's just a time delay. After 10 minutes, the light goes out and you can try again (but if the key is again not detected, the light will start flashing again and you have to wait another 10 minutes)
Someone else, who had this problem, told me to remove all other keys from my keyring. The weight of the other keys pulls on the ignition key causing the key to be unreadable. It has been 7 weeks since I have been doing this and have not had a problem
you def messed up it needs the ignition key to bypass the theft system. without it you cant start it. replace the housing install a new ignition key and tumbler and have reprogramed to solve this problem
You need to reset the theft system. To do this, try to start it. It should start and die. Then after it dies and the theft light is flashing, leave the key on for 10 minutes. After 10 min, the theft light should go out. After the theft light goes out, turn off the key. Count to 5, then restart it. Then it should work.
It might pay you to call a locksmith. Good ones know how to get into cars and they usually know how to get the codes needed to cut you a new key. That might cost you about $15 depending versus all the hassle for you.
when security light comes on your car is in theft mode.you can try another key.if engine still dont crank.dealership have to fix it.they have check the ignition switch and.pcm theft detterrant system.also cars keys have a chip on it.they have to check to see if pcm is reading the keys.if not they have to replace ignition switch and keys and reprogram your pcm theft deterrant system.so your car will crank.