My auto cal won't flash my ECM it keeps saying wait 10 seconds and then flickers saying trying to connect, it does this for about a minute and then I get a $0537 code. Also my security light is on but the truck still runs and drives like normal. And another thing is that whatever caused my security light to come on it locked in my old PPE tuner which I can't get back to stock so I'm trying to overwrite it. I need some help on this please!