My check engine light comes on intermittently and then seems to clear. I pulled the codes and I have a U1097. From elsewhere in this forum I retrieved the code descriptions:

U1097 Loss of Speedometer Serial data Carb
U1097 Loss of Speedometer Serial data EFI
U1097 Loss of Speedometer Serial data TSM/TSSM

I am not exactly what that means or what to do with that information. How worried should I be about this?

Any thoughts would be appreciated.

 

Could be many things - one guy traced it to his battery:

https://www.hdforums.com/forum/elect...e-lite-on.html

https://www.hdforums.com/forum/tags/u1097.html