I have a 2000 Impala, a couple of days ago my car would'nt start, the security light came on and flash 6 times and kept doing the same for a
while but finally started. It has done the same thing a couple of times since then but I can'nt pinpoint the problem.
Thanks for any help
Can not offer any advise, but it sounds like a burglar alarm software glitch. Two questions have you researched on the web (besides this site which caters mostly to old carburetor muscle cars) about any known problems. I have a Chrysler that if you park the car facing due west the car will not crank up again because of a glitch in the software. It warns you that it is never going to start again when you leave the car as the horn gives a whimper instead of a honk.
Shop foreman for a Chevy dealer here. Your description sounds like a problem in the passlock system (factory anti-theft system). If I was forced to guess, I'd point the finger at the passlock sensor which is part of the igntion lock cylinder housing. It really needs to be scanned to see what code is stored in either the body control module or theft deterrant module. If it is the sensor, replacement requires reprogramming the theft code to the new sensor's value before it will work. Unless you're very versed in late model electronics, save yourself a hassle and get it to a reputable dealer.