Case IH 298967-11 - VCM – UCM / VCM: Steering valve communication fault

The control module has lost CAN bus communication with the electronic steering valve, or the data being broadcast by the valve is invalid or missing.

• MAGNUM AFS Connect
• Magnum 400 AFS Connect
• Magnum 240
• Magnum 260
• Magnum 280
• Magnum 340

1. 1

   Inspect the wiring harness between the UCM/VCM and the steering valve for broken wires, chafing, or corrosion at the connectors

2. 2

   Verify that the steering valve controller is receiving proper operating voltage and has a solid ground (loss of power causes it to drop off the CAN bus)

3. 3

   Check if the UCM/VCM has logged related codes (e.g., 298967-00 for internal error, or 519573-XX for calibration failures)

1. 1

   Isolate the Fault

   Disconnect the harness at the steering valve and use a multimeter to check for CAN High and CAN Low voltage (typically around 2.5V to 2.7V).

2. 2

   Repair Wiring

   If CAN voltage is missing or shorted, trace the harness back to the UCM/VCM and repair the damaged section.

3. 3

   Inspect the Valve Spool/Plugs

   Check for internal mechanical failures (such as a plug falling out of the steering valve spool) that can cause erratic behavior. If the valve is mechanically binding or internally damaged, it must be removed.

4. 4

   Replace the Valve

   If the wiring is intact and the valve's internal controller has failed (causing the communication loss), replace the Autoguidance/Steering Valve assembly.

5. 5

   Recalibrate

   After replacing the steering valve, perform a steering valve calibration via the AFS Pro display or dealer diagnostic tool to clear the code and restore autoguidance functionality.