PTR 523966.31 – Come Home Detected

PTR 523966.31 (PTR )

Code: 523966.31



This error code, PTR 523966.31, indicates that the Power Train Reverser (PTR) control unit has detected Come-Home mode. Come-Home mode is typically a fail-safe mode that allows the vehicle to be moved to a safe location for repairs when a major fault is detected.


When this error is detected, the PTR control unit may limit the functionality of the transmission to allow only basic operation necessary to move the vehicle to a safe location. The system will display a warning message to alert the operator.


Identify and Diagnose Underlying Faults:

  • Check for any other diagnostic trouble codes that may indicate the underlying cause for the Come-Home mode activation.
  • Address and resolve these underlying issues as per their specific troubleshooting procedures.

Inspect Critical Systems:

  • Inspect critical vehicle systems, such as the transmission, engine, and control units, for any signs of major faults or failures.
  • Repair or replace any defective components as necessary.

Verify Safety Features:

  • Ensure that all safety features and fail-safe mechanisms are functioning correctly.
  • Confirm that the vehicle can be safely moved to a repair location without causing further damage.

Update Control Unit Software:

  • Ensure that the PTR control unit software is up-to-date.
  • Apply any available software updates or patches from the manufacturer.

Monitor Vehicle Operation:

  • After addressing the underlying issues, monitor the vehicle operation to ensure it does not re-enter Come-Home mode.
  • Verify that all systems are functioning correctly and the vehicle operates normally.


Come-Home mode is a critical safety feature designed to protect the vehicle and operator in the event of major faults. Proper diagnosis and resolution of the underlying issues are essential to restore normal vehicle operation.

Control Units: John Deere

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