New Holland T8010 Manual page 1642

B. If all of the controllers except the engine controller come back online, the problem is the Data Bus external
to the cab. Check the Data bus wiring outside of the cab for open circuits or shorts to ground. The Data
bus can be split once again at connector C060 to determine which portion of the exterior Data bus wiring
has the problem. If the problem cannot be found in the wiring, disconnect the engine controller to
determine if it has failed.
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting the Data Bus.
One intermittent connection can cause the entire bus to stop communications.
IMPORTANT: When there is a bad connection along the Data Bus wiring, the fault code will be accompanied by
multiple fault codes such as Aux/Hitch/PTO 11, INST 12011, INST 12031 and TRANS 12031.
NOTE: Also see the Data Bus schematic in poster schematic.
Section 55 - Electrical System, Controller - Chapter 5
55-5-37