The TCU is throwing the code for a failed Duty C but you can still drive it. It's just going to constantly remind you in that annoying way. I have never heard of a TCU "lying" or being messed up that badly. Not to say that it doesn't happen but if it says you have a failed Duty C, it is so. Just because you have it in FWD doesn't mean that the flashing will stop since the TCU isn't picking up an electrical signal from the Duty C.Originally Posted by hfxdesign