This is a problem with chevy vehicles that have the system theft light. after a couple of years of using the key, the lock tumblers inside the ignition switch tend to wear out and so causing the system to think it's being stolen. Now you have to put the key in and turn the ignition to the on position, without cranking the car and leave it for 10 minutes until the theft light goes out. Very annoying especially if you're in a hurry. The dealer cost to repair the ignition switch goes for about $600-$800. that includes re-teaching the key.
2002 chevy impala upon cranking the car the security light comes on then when started to drive all power to dashboard goes out. Speedometer, gas and all lights to dash stop working. radio still on. can't let the windows down nor lock doors with power. what may be the problem?
SOURCE: 2003 Chevy Impala. Security light comes on and car
Leave the key in the on position for 20 to 30 minutes without trying to start the vehicle. In most cases a lose of power to the computer has happened and the security must be reset.
SOURCE: 2001 Chevy Impala Security System
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.
SOURCE: what does it mean when the security light comes on
Means that anti-theft system is enable, will cut off fuel pump and injector's, if the light is flashing, get in car turn key to on, wait about 10mim or so till light stops flashing, then turn key to off and back to start engine.
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