Case IH 12031 – HITCH, INST, or TRANS: CAN data bus communication failure

The data bus link between the hitch controller and the rest of the tractor's network (specifically the instrumentation controller) has been interrupted.

• MX Magnum
• STX Steiger
• MX Magnum Series
• MX215
• MX245
• MX270
• MX275
• MX305
• MX335
• TG Series
• Steiger Series
• Puma Series
• TG210
• TG230
• TG255
• TG285
• T8000 Series

1. 1

   Verify if the code is 'Active' or 'Stored' — if there are no active alarms during operation, it may be a historical glitch

2. 2

   Inspect connector ends for damaged, bent, or dislocated pins

3. 3

   Check Connector C059 to the hitch controller to ensure it is secure and undamaged

4. 4

   Test the physical CAN Data Bus connections between the instrumentation controller and the hitch controller

1. 1

   Clear Stored Codes

   If the tractor is operating normally, clear the factory/stored memory codes and operate the tractor to see if code 12031 returns as an active fault.

2. 2

   Inspect and Clean Wiring

   If the code is active, locate the Hitch Controller and the Instrumentation Controller. Disconnect the wiring harnesses (including connector C059).

3. 3

   Repair Bad Connections

   Look for pushed-out pins, corrosion, or broken wires in the CAN bus harness. Repair any bad connections between the INST and HITCH controllers.

4. 4

   Module Replacement

   If the wiring and data bus connections are fully intact and functioning correctly, the failure mode is an internal controller failure. You will need to replace the Hitch Controller.