KAM code PO603
 

I was driving up the road the other night and the truck just died I popped it in neutral and shut the key off then started it back up. What would cause this code??

you might have one of my problems read my posts

603 is a code meaning the computer lost memory. Its quite common with a programer like you have and doesnt tell you much.

Sounds to me like a CPS issue... Have you replaced it ever?

CSIPSD always has useful information. I would be around with out him