Case IH 4045 – Arm Rest Module (ARU) / DV Module: Controller Fault (Data Memory) / ARU Controller Fault (data memory) (DV Module Only)

This code indicates an internal hardware or software failure within the controller's data memory (EEPROM/RAM). The module has failed its internal register or read/write check, meaning it can no longer reliably store or retrieve operational data, calibration values, or configuration settings.

• Maxxum
• Case IH Puma Series (140, 165, 175, 180, 195, 210)
• Case IH Magnum Series (MX210, MX230, MX255, MX285, 235-340)
• Case IH Steiger Series (280, 330, 380, 430, 530, 535)
• Case IH Maxxum Series

1. 1

   Check for associated active DTCs (such as CAN bus errors like 4042 or voltage codes like 4040/4041) and resolve power supply or CAN communication issues first, as severe voltage spikes can cause temporary memory read errors.

2. 2

   Attempt to clear the fault code using a diagnostic tool (like Case IH EST or Jaltest) and power cycle the tractor to see if the code returns.

3. 3

   Attempt to re-flash the ARU software if the diagnostic tool allows.

4. 4

   If the code is hard/active and cannot be cleared, or if the flash fails, the internal data memory is permanently corrupted or physically damaged, and the module must be replaced.

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical shorts or CAN bus spikes during removal.

2. 2

   Access the ARU

   Remove the trim panels and cover of the Multicontroller armrest to expose the internal electronics.

3. 3

   Remove the Module

   Carefully unplug the main wiring harnesses connected to the Arm Rest Module (ARU) / DV Module. Remove the retaining screws/bolts and extract the faulty controller.

4. 4

   Install the New Module

   Mount the replacement ARU and securely reconnect all wiring harnesses. Reassemble the armrest trim.

5. 5

   Configuration and Calibration

   Because the data memory stores tractor-specific settings, a new module will be blank or have default settings. You must use the tractor's "H" menu (e.g., H2, H3, H8 menus on the display) or a diagnostic tool to configure the module to the tractor's options (e.g., tire size, transmission type).

6. 6

   Sub-system Calibrations

   You must recalibrate the sub-systems controlled by the ARU, including: Electronic Draft Control (EDC) Valve, Transmission Clutches (Quickfill settings), Rear PTO Hydraulic torque sensor, and Differential lock steering angle sensor.