every time when you have a 29 code....the problems can be on the sensor, the wire or tractor manager.....this code can stay saved on vfc card.....check the distance between the read disc and the velocity proximity sensor this will be on 1mm of distance after that reboot the vfc card codes, turn on the key switch and accelerate the truck for a few moments....after then releace the traction joystick and remake the prove and done!!! the code is over.

mauricio Tapia
from chile

check the gap between the speed sensor and the disc above it if that gap is to lardge or the disc is rubbing you can get a code 29

code 29 is no movement detected when requested.
basically you are asking the truck to drive but it does not see itself moving.

check your brake assy and coil and wiring. also the speed feedback sensor cabling, it is mounted on top of the brake underneath a disc that passes over it to generate a speed/direction signal.