Question about 2003 Chevrolet Impala

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I changed the ignition and igntion switch on my 2003 chevy impala and my car wont start now !! Help Please

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Hello meganluvskhl
The ignition components that you replaced, are all part of the cars passloc anti theft system. These
parts must be programed to the system once installed for the car to start. Some locksmiths have
the equipment to do this but not many, you'll most likly have to take it to a GM dealer. Sorry I do not have better news. Hope this is helpful.

Posted on Feb 15, 2011

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You have changed a component that needs to be recognized by the ECU otherwise the ECU tells the immobilizer that there is a temper with ignition wires and car will not start as it thinks it is being stolen. Get the car to a garage to reprogram the ECU to recognize the new ignition.

Posted on Feb 15, 2011

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1 Answer

2003 chevy impala starts anti theft comes onput in gear dies wont do nothing


My impala did same thing and then would not start. I suspected anti theft problem I then had chevy dealer change ignition switch. It fixed problem second time I wasn't going to pay $ 750 for so I bought $40 dollar switch on ebay. It was an easy job following great video on you tube. When I went to start car it would not go. While doing relearn procedure (hook up battery charger before starting procedure) I got very tired of door chime so I found it was coming from left front door speaker. I removed wire to stop chime. When i went back to relearn procedure car started right up. I have a steady security light on but car has run fine for months. If you cruise and heater fan has also stopped working add wire from switched terminal on ignition switch to power feed wire on heater. It fixed both problems on mine.

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Try starting the car, when the security light comes on, leave the ignition switch on for at least ten minutes then switch it off and repeat. On the third attempt to start , the system should be reprogramed.

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http://wiki.answers.com/Q/How_do_you_unlock_a_steering_wheel_It_is_locked_and_the_key_will_not_work

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Try under the dash, attached to colum is a switch that the rod goes into from your ignition key switch, that may need to be adjusted tword your steering wheel just a touch, they go out of alignmnet from time to time

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1 Answer

2003 chevy impala security light comes on and car won't turn over. not sure why it ends up starting but it does.


Your vehicle was build with a GM anti theft device. There is a chip built into the igntion key, when you insert the igntion key the sensor inside the igntion cylinder will read the chip from the key. If for some reason that communication is broken the computer will think someone is trying to steal your car by using the incorrect key.
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1 Answer

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most likely you disconnected the igntion switch under the dash or knocked it loose, done it my self plenty of times.

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