code help

[baddkarmaracing]

i was driving the 6.0 yesterday and cranked the bully dog up on extreme to see what it was all about since we replaced the egr valve and its running alot better and when i got on it hard the speedo pegged real fast and the turned off is that normal with the speed limiter removed? and i checked for DTC's and it gave me a uo217 but no descrition of it and also everyonce in a while it will show another one that the description is icm kap or kep i dont remember which one it is or what the code is

[Diesel Freak]

If code was P0217 .....Engine Over Temperature Condition
Hope you have EGT gauge. Running Extreme too long can climp upwards to 1200+ pretty quick

[baddkarmaracing]

there isnt a guage but it has some deal that defuels it at 1175 (part of the extreme setting i think) or something like that but no guages yet we have pulled a 31ft tag along travel trailer on extreme ( forgot to put it on tow) and had no problems it wasnt a p it was a u i looked it up in a haynes manual but nothing


what about the speedo shutting down?