PTA 523917.08 – Hydrostatic Speed Sensor, Speed at Channel 2 Lower Than at Channel 1

PTA 523917.08 (PTA )

Code: 523917.08



This diagnostic trouble code is generated when the PTA control software detects a difference in frequency between the two sensor output signals for hydrostatic speed, indicating that the speed at channel 2 is lower than at channel 1.


Limited or no function of the transmission until the error is corrected, indicating a critical issue with the hydrostatic speed sensors.


Compare Sensor Signals:

  • Verify the output signals of both channels to ensure consistency.
  • Replace the sensor if there is a significant discrepancy between the two channels.

Inspect Wiring and Connectors:

  • Check the wiring and connectors of both channels for signs of damage or disconnection.
  • Repair or replace any faulty components.

Ensure Proper Calibration:

  • Verify that both channels are properly calibrated to provide accurate speed readings.
  • Recalibrate if necessary.

Monitor Vehicle Conditions:

  • Ensure the vehicle is not operating under conditions that could cause abnormal speed variations.


Accurate synchronization between the two sensor channels is essential for proper transmission operation. Regular monitoring and maintenance of sensors and their circuits can help prevent synchronization issues.

Control Units: John Deere

John Deere Parts
John Deere Logo