Case IH 51104 – AUX Controller (Remote Hydraulics Controller): Invalid Software Instruction Executed

This code indicates that the controller has attempted to execute an invalid software command (specifically logged as "AUX 1 type 4th instance"). The underlying condition is almost always a software glitch or memory error, though there is a small chance it is caused by an internal hardware failure within the controller.

• MX Magnum
• MX180
• MX210
• MX230
• MX255
• MX270
• MX285
• STX275
• STX325
• STX375
• STX425
• STX450
• STX480
• STX530
• TG210
• TG230
• TG255
• TG285

1. 1

   Check that the AUX controller has a solid connection to the battery and is properly grounded to rule out voltage irregularities.

2. 2

   Locate and inspect connector C053 at the Remote Hydraulics Controller for damage, corrosion, moisture, or bent/dislocated pins.

3. 3

   Perform a hard reset by clearing the fault code, shutting down the tractor completely, and restarting to see if the code returns.

1. 1

   Secure Connections

   Make sure the controller has a good connection at C053 to the battery and ground.

2. 2

   Clear and Restart

   Clear the fault code using the tractor's instrumentation or an Electronic Service Tool (EST). Shut down the tractor and restart.

3. 3

   Evaluate

   If the fault code does not return, it was a temporary software glitch likely caused by a voltage fluctuation.

4. 4

   Software Update / PSM Contact

   If the same fault code appears again, contact your district PSM (Product Support Manager) or local Case IH dealer to connect the Electronic Service Tool (EST) to reflash or update the AUX controller's software.

5. 5

   Hardware Replacement

   If the software cannot be reflashed or the internal memory is permanently corrupted (hardware failure), the AUX controller itself must be replaced and recalibrated.