John Deere 1231.12 – XMC: Control Software Internal Fault / Steering System Control Unit Fault

A communication problem or internal software failure between the XMC control software and the XSC control software. This communication breakdown disrupts proper functioning and leads to a shutdown of the automatic steering functions.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7200R
• 7215R
• 7230R
• 8245R
• 8400R

1. 1

   System Reboot: Restart the tractor (cycle the key switch) to see if the fault clears. Software initialization glitches can sometimes trigger this code temporarily.

2. 2

   Check for Other Codes: Look for active CAN bus or voltage-related codes. If the CAN bus is experiencing high error rates or message overflows, it may be a wiring issue rather than a failed module.

3. 3

   Software Version Check: Verify the current software payload on both the XMC and XSC modules, as a primary cause of this fault is a software version mismatch.

4. 4

   Harness Inspection: Inspect the CAN bus wiring harness and connectors at the Steering Control Unit for damage, corrosion, or loose pins.

1. 1

   Connect diagnostic tool

   Connect the John Deere Service ADVISOR diagnostic tool to the machine.

2. 2

   Read diagnostic trouble codes

   Read all stored and active diagnostic trouble codes to confirm XMC 001231.12 is the primary fault.

3. 3

   Check software versions

   Check the software versions of the XMC and XSC modules.

4. 4

   Update the Software

   Flash/update the XMC control software to the latest version to ensure it matches and communicates properly with the XSC software.

5. 5

   Clear codes and test

   Clear the codes and reboot the machine. Test the AutoTrac™ system to see if the steering engages properly.

6. 6

   Hardware Replacement

   If the software update does not resolve the issue, the internal hardware of the Steering Control Unit has failed.

7. 7

   Replace control unit

   Replace the AutoTrac Steering Control Unit.

8. 8

   Program and calibrate

   Use Service ADVISOR to program, configure, and calibrate the new steering module to the tractor.