Case IH 14906 – Instrument Cluster (ADIC / Enhanced ICU3) or Universal Controller (U1): Fast Steer Controller (KA) missing

This code indicates a communication failure on the tractor's CAN bus network. Specifically, the main vehicle network is unable to detect or communicate with the "KA" module, which is the identifier for the Steering Controller / Fast Steer Controller.

• Puma/Mid Range Magnum
• Maxxum
• Case IH Puma series
• Case IH Magnum series
• Case IH Steiger series

1. 1

   Check the fuses supplying power to the steering system to verify the KA Steering Controller is receiving proper voltage and has a clean ground connection.

2. 2

   Inspect the wiring harness and connectors leading to the KA Steering Controller for corrosion, pushed-out pins, or chafed wires.

3. 3

   Test the CAN High and CAN Low lines for continuity and proper terminating resistance (typically 60 ohms across the network).

4. 4

   Verify the ADIC (Advanced Digital Instrument Cluster) configuration. If the tractor does not have a Fast Steer Controller but is programmed to look for one, it will throw this code (often with code 14920).

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical spikes during module replacement.

2. 2

   Locate the Module

   Locate the KA Steering Controller (refer to your specific model's service manual for the exact cab/chassis location).

3. 3

   Remove the Controller

   Unplug the main harness connector from the controller and unbolt the module from its mounting bracket.

4. 4

   Install the New Controller

   Mount the replacement KA Steering Controller and securely reconnect the wiring harness.

5. 5

   Restore Power

   Reconnect the battery.

6. 6

   Clear Codes and Calibrate

   Access the tractor's 'H' menu (Calibration Menu) via the instrument cluster. Navigate to the H8 menu (Clear stored calibration) to reset all EEPROM values and erase stored error codes for the steering controller. Perform the steering system calibration (often found under menu D.20.C or similar) to calibrate the steering angle sensor, split valves, and LVDT sensors to the new controller.