U7170 Code 0603

[jims327]

new to this site, but reading alot about the code 0603, I also have a issue with the 85 HP setting with the code 0603, I ran at the 100+ setting with no issues or fault codes, but once I set it to the 85HP, The check engine light comes on, Not sure if the code 0603 is from the fuel pressure or not, I still can not get a streight answer about the code of what it is and how to correct it, Can I run at the 85 setting with the check engine light on without doing any damage to the truck, 2003 F250 7.3

[mikel]

I dont know what causes it inthe 85 tune only, it is being investigated.