PTQ 004309.14 – INFORMATION FOR OPERATOR: When Changing Ranges, Vehicle Changes Direction

PTQ 004309.14 (PTQ 4309.14)

Code: 004309.14

Shortcode: 4309.14


This diagnostic trouble code, PTQ 004309.14, indicates that when a range change is initiated, the vehicle unexpectedly changes direction. This issue may occur when driving on a slope, potentially due to unintended movement or control unit responses.


When this error is detected, the control unit responds by engaging the park lock to prevent unintended movement and ensure vehicle safety.


Inspect Transmission and Range Change Mechanism:

  • Check the transmission and range change mechanism for any signs of malfunction or misalignment.
  • Repair or adjust the mechanism as needed to ensure proper operation.

Ensure Level Surface:

  • Attempt range changes on a level surface to prevent unintended movement caused by slopes.
  • Avoid making range changes while driving on steep inclines.

Verify Control Unit Function:

  • Test the control unit for any faults or malfunctions that could cause unintended direction changes.
  • Replace the control unit if it is found to be defective.

Update Software:

  • Verify that the control software is up-to-date with the latest version.
  • Update the software if there are any available updates to improve system accuracy and error handling.

Monitor Vehicle Behavior:

  • After addressing the above steps, monitor the vehicle’s behavior during range changes to ensure it does not change direction unexpectedly.
  • Confirm that the park lock engages correctly to prevent unintended movement.


  • Regular inspection and maintenance of the transmission and control systems are essential to prevent issues during range changes.
  • If the issue persists, consult technical support or the manufacturer for further assistance.

Control Units: John Deere

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