This is going to sound unrelated, but has Fuse 27 by pass been done?
I had service advance track/hill decent faults, steering angle codes, wheel speed sensor codes and if I turned on upfitter 3&4 together the truck would die! Remote start stopped working.. it would just beep.
All of this was because of current bleed over from fuse 27.
My fuse 27 had not been done and the fuse looked fine so never even considered this to be the problem. I chased my tail for months trying to diagnose. Cleaned all body grounds, dielectric grease every connector on the harness, you name it.
The electrical current would transfer from the socket on fuse 27 into the Can-Bus signal and cause all kinds of current irregularities.
Ford could not find it, they wanted to replace BCM, ECU wire harness etc etc....
I was at a total loss on the issue, but since I had a relay kit and had the truck torn apart I did it one day. As soon as the battery was connected and truck fired up, everything was back to normal...everything!!
Z