Sounds like your BCM is going bad or there's a short in the harness for sure. You'll have to take it to a technician and have them hook it up to their scanner. I'm sure it'll say there's a loss of data communication.
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Originally Posted by mvickip
I am not sure if it is my Passlok system or what. I have 2004 Malibu Classic. Car always starts after it has set for an extended time. It has recently gotten to where if I have been driving it and get out to go into the store for a short time, when I come back it will turn over but not start. Theft light is off. If I try to start two or three times it will typically start. I have been driving and noticed that speedometer and tach dropped to zero for about 2 seconds and theft light flashed and then everything went back to normal and engine continued to keep running. Two days ago when I went in the store and came out the vehicle would not start. Left the ignition on to try the 11 minute trick. After about two minutes doors locked again, buzzer went off, theft light came on and went off. Tried vehicle and it started right up. Similar issues to what is posted but also different. Is this an ignition switch? Would appreciate your thoughts
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