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Re: Key coding a 2001 Chevy Impala
Yes! After installed, trun key on (engine not running) for 30 mins.,trun off and back on for 10mins., turn off and back on for 10 mins. more; flashing light will go off turn off and try starting engine. Good luck! it's GM's reset for that.
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1995 to 2001 Cavalier & Pontiac Sunfire ignition lock cylinders are the same. Be advised that your car has an anti theft system. If you plan on installing a used cylinder from another car, you will need to have the replacement cylinder "coded" to your original key OR have a key with the same resistor value as your original key, cut for the replacement cylinder [new or used] Without doing this, the car will not start.
try this install the new key in the ignition switch. turn on the ignition switch to the on position for 10 minutes.when the system led lock light disappear.turn off the ignition switch for 5 seconds.then start the engine.still dont start.try this procedure few more times.if car still dont crank and you see the pad lock symbols.the dealership will have to reprogram the new key and body control module.
If your key is worn try getting a new one cut. The ignition lock cylinder and keys do not contain any
coded electronic components. The lock cylinder housing contains the coded
electronic components. Changing an ignition lock cylinder or replacing a key
is a purely mechanical process which does not affect the vehicle theft deterrent
system. To replace an existing key, simply cut a new key to match the existing
one. If no keys are available, the lock cylinder must be changed.
To change the lock cylinder, simply replace the existing lock cylinder with
one of the same type. If you are unable to operate the ignition cylinder with a new key then you will probably need to replace the cylinder and switch.Replacement of the switch involves reprogramming The system may be programmed with or without a scan tool. There is a way to get the cylinder out without replacing the switch but this procedure should be performed by a qualified GM technician as it involves removal of the switch and some precise drilling.
the new cylinder's key has a different code, so the anti-theft module has to reset to accept that code, with the old cylinder u could program extra keys as long as u had one key that worked, but since that is not the case with a new lock cylinder I think u are stuck with taking it to the dealer, any GM dealer can do this job, call around and try to get a lower estimate. Before having it towed try this work around I found on a car thread on this issue:
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 passlock system to recognize your key. Not sure this will work but it is worth a try.
I have a 2001 Impala. My security light will flash and sometimes the car won't start. My dad told me turn the key to the start position, place your foot on the break, put your car in the last gear it was in (D, R, or N). Then shift all the way back into park. Make sure you shift all the way into park. Take your foot off the break. Then turn ignition back to off. Your car should then start right up. He said the sensor still thinks the car is in D, R, or N although it's in park. So it confuses the system and it doesn't start because it doesn't know which function to do. It pretty much locks up. I'm pos. this will work. My car does it every few months. Hope this helps.