PTH 000190.09 – Engine Speed Abnormal Update Rate

PTH 000190.09 (PTH 190.09)

Code: 000190.09

Shortcode: 190.09


This fault code indicates that the engine speed data is missing or has an abnormal update rate over the CAN network. This can be caused by issues with the transmission control unit (TCU), CAN system communication errors, or problems with the programming of control units.


When this error is detected, the equipment may experience engine performance issues, including unstable or incorrect speed regulation. The system might limit engine speed functionality to prevent damage.


Inspect Transmission Control Unit (TCU):

  • Perform diagnostic tests on the TCU to identify any faults.
  • Ensure all electrical connections to the TCU are secure and free from corrosion.
  • Replace the TCU if it is found to be faulty.

CAN System Diagnosis:

  • Conduct a thorough diagnosis of the CAN system.
  • Check for any communication errors, faulty nodes, or wiring issues.
  • Repair or replace any faulty components.

Programming Control Units:

  • Ensure all control units are correctly programmed.
  • Reprogram the units if necessary to restore proper communication and functionality.

Update Control Software:

  • Ensure the control unit software is current with the latest updates and improvements.

Consult Technical Support:

  • If the issue persists, contact technical support for further diagnostics and potential component replacement.

Monitor System Performance:

  • After addressing the issue, monitor the engine speed system to ensure normal operation and that the fault does not recur.


Regular inspection and maintenance of the TCU and CAN system can help avoid such faults. Environmental factors such as electromagnetic interference can also affect CAN communication, so consider these factors when troubleshooting.

Control Units: John Deere

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