PTA 524156.07 – Hydrostatic Unit, Current Does Not Match Registered Speed

PTA 524156.07 (PTA )

Code: 524156.07



This diagnostic trouble code is generated when the amperage at the proportional solenoids of the hydrostatic unit does not match the registered ratio between the transmission input speed and the speed of the hydrostatic unit, indicating a problem with the hydrostatic unit.


The tractor may only be moved in the come-home mode as long as this fault is active, indicating a critical issue with the hydrostatic unit.


Inspect Hydrostatic Unit:

  • Verify that the hydrostatic unit is functioning correctly.
  • Repair or replace any defective components in the hydrostatic unit.

Test Proportional Solenoids:

  • Measure the current flow to the proportional solenoids using a multimeter.
  • Replace any solenoids that are not drawing the correct current.

Examine Wiring and Connectors:

  • Inspect all wiring and connectors associated with the hydrostatic unit for signs of damage or disconnection.
  • Repair or replace any damaged components to ensure proper electrical connections.

Check Transmission Input Speed:

  • Verify the accuracy of the transmission input speed sensor.
  • Replace the sensor if it is providing incorrect readings.

Ensure Proper Calibration:

  • Ensure that the hydrostatic unit and associated sensors are properly calibrated.
  • Recalibrate if necessary.


Maintaining proper functionality of the hydrostatic unit and its components is crucial for vehicle operation. Regular inspection and maintenance can help prevent significant issues and ensure reliable performance.

Control Units: John Deere

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