TRY THIS!
30-MINUTE LEARN PROCEDURE
1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON, vehicle will not start.
3. Observe the SECURITY telltale. After approximately 10 minutes, the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds.
5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
6. Start the engine. The vehicle has now learned the Passlock(TM) Sensor Data Code and/or password.
IMPORTANT: The vehicle learns the Passlock(TM) Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
SOURCE: chevy impala starting problem
when you boost it it run and if you leave it there overnight or a few days you need to boost it again you may
have a light that stay on in the trunk or something like that something is draining the battery if our mechanic cant help go see another on its and electric problem start to check if no light or accessorry stay on hope it a fixya thanks pierre
SOURCE: radio unlock coed for chevy impala
• A module which communicates on the class 2 serial data circuit which supplies VIN information to the radio is replaced and not properly setup with the correct VIN information for that vehicle. The only way to unlock the radio is by using a scan tool.
SOURCE: I have a 02 chevy impala that sometimes wont turn on.
Anti theft problem Ignition lock cylinder or Body control module
SOURCE: I replaced my 00 chevy impala radio with another and its locked
if its a factory radio you must take it to a dealer 50 bucks to unlock it
its an anti theft device
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