John Deere 523966.31 – PTR: Come Home Mode Activated

Fault code 523966.31 indicates that the Come Home mode (also known as Limp Home mode) has been activated. The system generates this code when it detects that the Come Home fuse is fitted (often in the F5 slot) or the plug for the come-home function is in the COME-HOME position. Come Home mode is a fail-safe protective measure that limits transmission functionality, allowing the operator to safely drive the machine to a service location when a major fault or operational anomaly is detected.

• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7630
• 7720
• 7730
• 7820
• 7830
• 7920
• 7930
• 8310RT
• 8335RT
• 8360RT
• 4044M
• 4044R
• 4049M
• 4049R
• 4052M
• 4052R
• 4066M
• 4066R

1. 1

   Inspect the designated Come Home fuse slot (often F5) to ensure the fuse is not installed unless the vehicle is intentionally placed in Come Home mode.

2. 2

   Check the display for other active diagnostic trouble codes (DTCs) that indicate the root cause of a major malfunction.

3. 3

   Inspect the reverse drive lever (shuttle lever) to ensure it operates smoothly and correctly engages in the neutral or park position.

4. 4

   Restart the engine to cycle power and verify if the active code reappears, which can clear false triggers.

1. 1

   Remove the Come Home fuse

   If the Come Home fuse is installed in the fuse panel, remove it.

2. 2

   Test operation

   With the fuse removed, operate the vehicle for 5 minutes. If the code does not return, the issue was simply the presence of the fuse.

3. 3

   Engage neutral or park

   If the code was triggered intentionally to move the tractor, move the reverse drive lever to its neutral or park position to access the next stage of the come-home function.

4. 4

   Address root causes

   If the code returns after removing the fuse, investigate and repair the underlying faults indicated by other active DTCs, such as transmission faults or sensor malfunctions.

5. 5

   Repair or replace reverse drive lever

   If the reverse drive lever is found to be defective or not sending the correct neutral signal, repair or replace the lever assembly.

6. 6

   Update control software

   Verify that the control software (PTR, PTQ, ACU) is up-to-date. Apply any available software updates from John Deere to prevent false triggers of the Come Home mode.

7. 7

   Perform system reset

   After repairs, use specialized John Deere diagnostic equipment (Service ADVISOR) to clear the mode and reset the transmission system.