I have also replaced the 7 pin trailer plug and know it works correctly.
I have checked every fuse with a multimeter and everything is good. Rivertown Ford checked the TBC and it checks out good. Still scratching my head and cannot figure it out. Anyone?check your fuses. make sure they are all there and continuity is good.
I have a U1900 Controller Area Network Communication Bus Malfunction.Are there codes? Speedo works now?
Hook up ForScan and look at the TBC controller
Great read and very detailed, Thanks for that info and your assistance in helping me get this issue fixed. Ever since I have owned the truck (FEB 08) I remember the U1900 Code always popping up. I was told by the mechanic at the time that the U1900 “Always pops up on these trucks”.Connecting a scanner with the ignition on can sometimes throw the U1900 code -- clear the codes, cycle the key, and see what pops up
it it re-occurs then disconnect the instrument cluster and scan again
This guy has a decent explanation of the U1900 code -- may want to look at it and see if anything jumps out