PTR 000191.17 – Top Shaft Speed Too Low

PTR 000191.17 (PTR 191.17)

Code: 000191.17

Shortcode: 191.17


This error code, PTR 000191.17, indicates that the Power Train Reverser (PTR) control unit has detected that the top shaft speed is too low while the transmission is fully engaged and the engine is running. This can occur due to mechanical issues, sensor faults, or problems within the control system.


When this error is detected, the PTR control unit may limit transmission functionality to prevent potential damage. The system may also display a warning message to alert the operator.


Inspect Top Shaft:

  • Check the top shaft and related components for any mechanical issues that could cause low speed.
  • Ensure there are no obstructions or excessive wear affecting the top shaft performance.

Check Sensors:

  • Inspect the sensors monitoring the top shaft speed for proper operation.
  • Ensure the sensors are clean, aligned correctly, and free from damage. Replace if necessary.

Verify Wiring and Connections:

  • Inspect the wiring and connectors related to the top shaft speed sensors.
  • Ensure all connections are secure and free from corrosion or damage.

Test Sensor Circuitry:

  • Use a multimeter to test the sensor circuitry for proper functionality.
  • Ensure there are no short circuits or open circuits causing incorrect speed readings.

Examine Control Unit:

  • Verify that the PTR control unit is functioning correctly.
  • Check for any diagnostic trouble codes in the control unit that might relate to top shaft speed issues.

Update Software:

  • Ensure that the PTR control unit software is up-to-date.
  • Apply any available software updates or patches from the manufacturer.

Monitor Shaft Speed:

  • After addressing the issue, monitor the top shaft speed during operation.
  • Ensure that the speed remains within acceptable limits with the transmission engaged.


Proper maintenance of the top shaft and related sensors is crucial for optimal transmission performance. Regular inspections and timely repairs can help prevent such issues.

Control Units: John Deere

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