Sons 300m and I need help please!

I have had the cam sensor go bad on my Sebring. It did similar with just up and dying. Not setting a code. It is hit and miss with them setting a code when they go. The other thing you want to look at is to see that you are getting the 5v can bus voltage that make everything work. I have also run across a bad radio in the past and a bad O2 sensor that both pulled down the 5v signal so nothing worked and the ad did not run.