If you leave your key in the ON position for 15 minutes, the security system should relearn it and work once again. But the halo around the lock cylinder needs changing. You can purchase a kit from GM that includes the lock cylinder along with the halo. you do not need to replace everything, just the halo is what usually goes bad.
SOURCE: 97 Chevy Monte Carlo won't start, security light is on
disconnect battery for 24 hrs so the computer will reset and if that dont work take it to chevy dealer and have them reset it manually
SOURCE: security light on car want start
Car is in theft mode. Call dealer with vin number handy and the service dept. should tell you how to get it out of theft-mode.
SOURCE: Twice in a week my security light has come on and
disconnect the +battery post with an 8mm socket and leave the thing off for 2 minutes.reconnect it.
SOURCE: 2002 Monte Carlo Security system
the process takes about thirty minutes. in three ten minute key cycles. here is how you do it . make sure that the battery is fully charged. step on parking brake pedal and leave it down this will keep the head lights off. turn the key and try to start it then leave it in the on position. you have to leave the key in the on position for ten minutes. you will see the security light on. after the ten minutes the light will go off then turn the key to the start position. turn the key all the way back to the off position and count to three. then try to start it and leave the key in the on position for another ten minutes till the security light goes out. you have to do this same process three times to reset the security system. sometimes you get lucky and it will start after the first ten minute cycle.
SOURCE: how di I reset my security light on my 2003 monte
PASSKEY LOCKOUT RESET ALL GM CARS 1999 AND UP
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the PASSKEY system to recognize your key.
2,584 views
Usually answered in minutes!
×