Here is a story with my Grand Am. I went to a gas station to fill up my tank and after I filled up my tank, the car would not start!!! First, the good luck. There was a license mechanic at the same service station, and he tried to start the car but no luck. So I had it tolled to my mechanic. He spent the whole afternoon trying to figure what is wrong, and he couldnt find anything...
But the next day, the car mysteriously start by itself in the garage, and he doesnt know why, so I wasn't charge anything...good luck. Being a little nervous since I don't want to get stuck on the highway, I had figure out the problem without it costing to much... so after going through pages on the forum, I finally figured out the problem.
It is GM Theftlock system! Sometimes the car computer thinks the ignition has been tampered with, for whatever reason (alarm, keyswitch), the vehicle cuts off fuel and refuses to start.
The solution for me was to 'reset' the car computer by leaving your key in the "ON" position for about 10 minutes until the security light stops blinking and become solid. Then turn the key to "OFF" and restart the vehicle.
It worked for me!
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