I have a 2011 6.7 F-350 Diesel.
I bought the truck new and I've never had any problems with it until now.

I have a SCT Chip & Tuner. It needed an update so I returned the truck to stock and a code came up on my dashboard that said "reduced engine power" which obviously I thought was Normal because of the modifications done to my truck. I updated my tuner and returned the truck to a performance tune but this dashboard code will not go away. My truck isn't reading any codes and there's no other indication lights on. The truck has Normal RPM readings but 0 throttle response. No power at all... If anyone has any information that can help me with my issue please let me know & feel free to ask questions about my situation if you think it will help diagnose the problem. Thanks

 

did you get a code from your tuner? There has to be a code to get reduced power.

 

After the reprogram, have you cleared codes and 'rebooted' the trucks computers?