PTH 000190.18 – Engine Speed Data Valid but Below Normal Operating Range – Moderately Severe Level

PTH 000190.18 (PTH 190.18)

Code: 000190.18

Shortcode: 190.18


This fault code indicates that the high-idle engine speed is below the normal operating range at a moderately severe level. This can be due to significant calibration issues, sensor errors, or transmission control unit (TCU) malfunctions.


When this error is detected, the equipment may experience lower engine speeds at high-idle than normal, potentially affecting performance and operational efficiency. The system might take corrective actions to maintain safe operating conditions.


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.

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 up-to-date with the latest fixes 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 prevent such faults. Environmental factors such as electromagnetic interference can also affect CAN communication, so consider these factors during troubleshooting.

Control Units: John Deere

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