Case IH 2260-02 - UCM – UCM: Vehicle controller loss of communication with rear pilot head #8.

The control module has lost CAN bus communication with the electronic actuator specifically controlling Rear Remote Valve #8. This is typically caused by a failed pilot head internal circuit (which can sometimes short out and take down the entire CAN bus network), a damaged wiring harness, or a corroded connector.

• MAGNUM AFS Connect
• Magnum AFS Connect Series (e.g., 250, 280, 310, 340, 380, 400)
• Steiger & Quadtrac Series (e.g., 350, 370, 400, 420, 450, 470, 500, 580)
• Puma & Optum Series (e.g., Puma 185-240, Optum 270-300)

1. 1

   Isolate the CAN Bus: Unplug the electrical connector at rear pilot head #8. If a short inside this specific pilot head was crashing the CAN bus, unplugging it will often bring the rest of the remote valves back online.

2. 2

   Inspect Wiring and Connectors: Check the harness leading to remote #8 for pinched wires, rodent damage, or corrosion inside the connector pins.

3. 3

   Check Power and Ground: Verify that the pilot head is receiving proper 12V power and ground from the UCM.

4. 4

   Swap Test: Swap the pilot head from valve #8 with a known good pilot head from another valve (e.g., valve #7). If the fault code changes to the new location (e.g., loss of communication with pilot head #7), the pilot head is definitively the point of failure. If the code remains on #8, the issue is in the tractor's wiring harness.

1. 1

   Depressurize the System

   Ensure the tractor is turned off, the key is removed, and hydraulic pressure is relieved from the rear remotes.

2. 2

   Disconnect Electronics

   Unplug the CAN bus electrical connector from the faulty pilot head #8.

3. 3

   Remove the Pilot Head

   Remove the mounting hardware (typically hex socket screws, e.g., M5 x 20mm) securing the pilot head to the main remote valve body.

4. 4

   Install the New Part

   Mount the new pilot head valve assembly onto the valve body and torque the hex screws to OEM specifications.

5. 5

   Reconnect

   Plug the electrical connector back into the new pilot head.

6. 6

   Calibrate the Valves

   You must perform a hydraulic remote valve calibration. This is done using the Case IH Electronic Service Tool (EST) laptop or through the tractor's AFS Pro display calibration menus.

7. 7

   Clear Codes

   Clear the 2260-02 fault code from the UCM and test the remote valve for proper operation.