Very common for the Body Control Module to fail or a connection problem at the BCM. Have your mechanic try communicating with the Bcm. Also check the connections.
Gee not codes to read
leaves you with ECU or a module fault
fuel pump or fuel pump relay
bad fuel
while hot.. coils packs or crank angle sensor might be worth testing
SOURCE: Chevy Blazer 1999,car doesn't keep running after started ,car has Passlock
hmmm, sounds like an ignition switch problem. Not the tumbler/key switch, the ignition switch.
SOURCE: fuse for locks constantly blows
Try replacing the relay. Clean the socket of the relay and fuse
SOURCE: wont start security light stays on
Body Control Module (BCM) on both counts. Find a shop in your town that specializes in electrical systems to test it. Beware, these can be intermittent problems, so make sure they keep it until the car does what you have observed. Expect to spend about $450 for the replacment. Dealers quoted me between $700 and $1,100 for the same repair. By the way, a new BCM will probably only last you about 12 months.
SOURCE: 2001 impala passlock relearned and still won't start
i bypassed the whole system with a resistor ...paid my electrician $150
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I am having the same problem now , did you ever find the problem
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