hi guys i have a question today i went with my dyna to the dealer for ceck the error code he says that can diagnostic the errors on their pc because the fuel pack was still connected, and doesnt allow to see all the parameters i have to disconnected before and put the plug in the ecu stock like before than they could ceck. is it true?

 

the codes show on the odometer display... that may be ture if they plug the bike in but you can run a self check on the codes and get them as well
here is how:
How to check diagnostic codes
https://www.hdforums.com/forum/dyna-glide-models/264270-check-engine-light.html
https://www.hdforums.com/m_2293229/tm.htm
https://www.hdforums.com/forum/dyna-glide-models/139328-identify-trouble-codes-and-clear-them.html

 

i know , i see the error code in the speedometer, but i wanted be sure that fuel pack doesnt cancel all the data from ecu