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From what I have read here the P0603 code is nothing to worry about. If you have a programer the programer will cause this code to throw.
Hope this helps.
Hal
I get the same code. Started setting once I loaded the program. I searched the forum and it seemed common with a program loaded. Buddy of mine just loaded a program in his 6.0 and it set the same code. I wouldn't worry too much.
use some of the CRC spray cleaner on them. I usually take the pliers to the battery posts and my pocket knife to the cable ends. Once they are nice an shiny, I spray them down with the CRC electric contact cleaner. After they dry, I tighten the ends down and coat the outer surface of the end and posts with the CRC di-electric grease.
Its not the cheapest route, but definitely keeps them cleaner a lot longer than arm & hammer ever could.