PTD 521239.04 – Reverse Brake Oil Pressure Too Low

PTD 521239.04 (PTD )

Code: 521239.04



This diagnostic trouble code is generated when there is no oil pressure at the reverse brake even though an oil pressure was specified. This indicates a problem in the oil circuit of the reverse brake or a faulty proportional solenoid valve.


When this error is detected, the control software may limit or disable the transmission functions, particularly affecting the reverse brake operation.


Inspect Oil Circuit:

  • Check the oil circuit for blockages or leaks.
  • Repair or replace any damaged components in the oil circuit.

Test Proportional Solenoid Valve:

  • Perform a diagnostic test on the proportional solenoid valve to ensure it is functioning correctly.
  • Replace the solenoid valve if it is found to be defective.

Check Oil Pump:

  • Verify that the oil pump is operating correctly and providing sufficient pressure.
  • Replace the oil pump if it is malfunctioning.

Consult Technical Support:

  • If the problem persists, consult technical support or a qualified technician for further diagnosis and repair.

Monitor System:

  • After performing repairs, monitor the oil pressure at the reverse brake to ensure it is within the specified range.


Regular maintenance and inspection of the oil circuit and solenoid valves can help prevent pressure issues and ensure reliable operation.

Control Units: John Deere

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