I was out re-flashing my 2005 softail with another fuel-moto tune i had on my power vision, a little later on i noticed my key light flashing, i did a diag with the power vision and come up with these 2 codes, if it means anything, i have a Dakota digital speedo.
U1255 Serial Data Error/Missing Message EFI
U1097 loss speedometer serial data.
i cleared them with the PV, haven't started or rode the bike since.
thanks

 

There's a STICKY here on the Forums somewhere that explains all the codes thrown out by the ECM. Plus you can Google them. Remember Google?

 

you think i haven't Google them?
it just brings my right to them threads you speak off, it just tells you what i posted above, what im asking..is what can cause "serial Data Error/Missing Message EFI AND loss speedometer serial data"