Case IH 51142 – Auxiliary Controller (AUX) / Armrest Controller: Invalid Software Instruction Executed

The controller attempted to process a corrupt or unrecognized software command. This is usually a software problem, though there is a small chance it is caused by an internal hardware failure within the controller.

• MX Magnum
• Case IH MX Magnum Series
• MX180
• MX200
• MX210
• MX220
• MX230
• MX240
• MX255
• MX270
• MX285
• Case IH TG Series
• TG210
• TG230
• TG255
• TG285

1. 1

   Verify that the controller has a solid connection to the battery, specifically checking connector C053

2. 2

   Ensure the controller is properly grounded

3. 3

   Clear the fault code from the system

4. 4

   Shut down the tractor completely and restart it to see if the code returns

1. 1

   Inspect wiring harness

   Inspect the wiring harness leading to the Auxiliary/Armrest controller for any signs of damage, focusing on the power and ground circuits (Connector C053).

2. 2

   Clean and tighten connections

   Clean and tighten the battery and ground connections.

3. 3

   Clear fault code and restart

   Clear the fault code, cycle the key, and restart the tractor.

4. 4

   Attempt software reflash

   If the fault code returns immediately, the issue is internal to the controller (software corruption or hardware failure). Contact your dealer to attempt a software reflash.

5. 5

   Replace controller

   If a software update does not resolve the issue, replace the Auxiliary/Armrest controller.

6. 6

   Calibrate system

   After installing a new controller, a dealer must connect a laptop with the OEM diagnostic software (EST) to calibrate the hydraulic levers and system.