Did you try re-doing the FORScan tweak that enabled TM? ( IPC and enabled select drive mode.) My first guess is that they re-flashed the PCM with what the factory said it should be, which disabled TM. Then, when it starts up it sees the TM switch which is what is throwing the code. But that is totally a guess. It would be interesting to see what happens if you re-enable the tweak.Took my Ranger in for service. Now the Terrian Managment doesn’t work. I ask my service advisor about it. She the PCM was updated, because the truck didn’t come with it there is nothing they could do about it. I get a trouble code in the IPC on Forscan that is OU439:83-82. Any information would be helpful.
If you did and you said that I apologize. If that is what happened, my guess is that Ford closed a hole in the software. Might have been a bug that enabled it by accident.