PTH 523591.03 – Machine Drive Voltage Above Normal, or Shorted to High Source

PTH 523591.03 (PTH )

Code: 523591.03



This fault code indicates that the reverse pedal sensor voltage is above the normal operating range or is shorted to a high power source. This can be caused by sensor malfunctions, wiring issues, or power surges.


When this error is detected, the equipment may experience issues with reverse pedal control, leading to improper or erratic driving behavior. The system logs the fault and may limit reverse motion to prevent damage.


Inspect Reverse Pedal Sensor (B12):

  • Check the reverse pedal sensor for proper operation.
  • Ensure the sensor is not damaged and is functioning correctly.
  • Verify all electrical connections are secure and free from corrosion.

Test Power Train Hydrostatic Control Unit (PTH):

  • Perform diagnostic tests on the PTH control unit to identify any faults.
  • Ensure all electrical connections to the control unit are secure and free from corrosion.

Check Wiring and Connections:

  • Inspect the wiring harness connected to the reverse pedal sensor for any signs of damage, wear, or loose connections.
  • Repair or replace any damaged wiring as necessary.

Update Control Software:

  • Ensure the control unit software is up-to-date with the latest fixes and improvements.

Consult Technical Support:

  • If the issue persists, contact technical support for further diagnostics and assistance.

Monitor System Performance:

  • After addressing the issue, monitor the reverse pedal system to ensure normal operation and that the fault does not reappear.


Regular inspection and maintenance of the reverse pedal sensor and associated wiring can prevent this fault. Consider environmental factors such as moisture or corrosion that can impact sensor performance.

Control Units: John Deere

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