i have a 2002 pt cruiser the cruise light comes on by it self and the engine cut

do you mean pcm? mike

there are like 4 modules inthis car,pcm and bcm which is body control module. have all modules read for codes. the bcm controls all grd circuits

i did a scan at parts house a couple of codes were p1684 and p1685 also 2codes from the car scan p0123 and p1193 if that helps