PTQ 000191.00 – Transmission Speed Too High During Calibration

PTQ 000191.00 (PTQ 191.00)

Code: 000191.00

Shortcode: 191.00


This diagnostic trouble code, PTQ 000191.00, is generated when transmission speed is detected during the calibration process. This can occur due to a defective transmission speed sensor or if the tractor is not positioned on a level surface during calibration, leading to potential movement of the tractor.


When this error is detected, the control software cancels the transmission calibration process to prevent inaccurate calibration.


Check Transmission Speed Sensor:

  • Inspect the transmission speed sensor for any signs of damage or malfunction.
  • Replace the sensor if it is found to be defective.

Ensure Level Surface:

  • Make sure the tractor is positioned on a completely level surface before initiating the calibration process.
  • Reattempt calibration in a different location if necessary to ensure stability.

Verify CAN BUS Data:

  • Ensure that the transmission speed data received via the CAN BUS is accurate.
  • Check the CAN BUS wiring and connections for any loose connections, damage, or corrosion. Repair or replace as necessary.

Software Update:

  • Verify that the control software is up-to-date with the latest version.
  • Update the software if there are any available updates to improve calibration accuracy and error handling.

Monitor Calibration Process:

  • After addressing the above steps, restart the transmission calibration process.
  • Observe the system to ensure the calibration completes without further errors.


  • Regular maintenance and inspection of the transmission speed sensors and CAN BUS system are crucial for preventing this type of error.
  • If the issue persists despite taking the above measures, consult technical support or the manufacturer for further assistance.

Control Units: John Deere

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