Got a code and can't find much more than a definition. I searched here first and nothing (That's a first!!!) the Google search only defines it as "Vehicle Communication Bus D (-) Open".

Can anyone shed any light on this? I cleared it out but it came back after a few days.

Nothing much has changed with the truck still runs good just seeing the code when I look/ scan it. (I can hear it now. stop looking=problem fixed)

Just for the heck of it I unplugged the EGR to see if it would throw additional codes and it did. Never saw a "U" code so I was thinking the scanner was malfunctioning. It picked up three more p0403, p0405 and p480 with it unplugged .

 

I can't find that code in the 6.0 bible list, but AE gives the same definition you listed. U codes usually mean some kind of computer communication problem but no specific module is listed.

 

Thanks Npccpatrsman. I cleared it again last night and will be driving to Orlando for the DEMA (3 hours) show hopefully my ECM isn't going out.