May be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: chinasinoy.com
SOURCE: I have a Saturn L200.
You should try re-learning the pass-lock system first. Turn the key to the on position and leave it on for 10 min, or until the security light goes out. Turn the key off for at least 30 sec. Turn the key back on, very important not to turn too far and bump the starter, for another 10 minute cycle. Do this 3 times for a total of 30 min. After the 3rd cycle it should start.
SOURCE: 2000 Saturn SL2 - replaced ignition then BCM failed. Related?
the problem is not the bcm. the passlock security sensor is in the cylinder and housing, if the cyl and or housing was replaced the system must be relearned. if you replace the bcm you still need to relearn the system or it still will not start.
SOURCE: key can not turn ignition to start car
its common for the ignition lock cylinder or the ignition cylinder housing to fail on 2000-2001 L series saturns. Try using another key to see if that helps.
SOURCE: passlock lite flashes, won't let engine stay on
There is a detailed write-up on passlock here: http://newrockies.ca . The guy is great, this was the only way I was able to save my Park Avenue.
For car running hot and overheating issues, I suggest to you go
through this help links. Click this link below and go through the
troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and
troubleshooting?
http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.
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