RPT 000084.19 – Wheel Speed Sensor Fault

RPT 000084.19 (RPT 84.19)

Code: 000084.19

Shortcode: 84.19


This diagnostic trouble code, RPT 000084.19, is generated when the CCU (Central Control Unit) control software cannot determine the wheel speed, thus failing to provide the CAN BUS with any relevant data. This results in a transmitted replacement value, triggering the diagnostic trouble code in the RPT control software. When active, this fault also generates a diagnostic trouble code in the CCU control software, which takes priority over the RPT code.


When this error is detected, the control software’s functionality is significantly limited or entirely non-functional. This affects the overall performance of the equipment, leading to reduced operational capability.


Inspect Wheel Speed Sensor:

  • Examine the wheel speed sensor for any visible damage or disconnections.
  • Ensure the sensor is securely mounted and connected properly.

Check Wiring and Connections:

  • Inspect the wiring and connections between the wheel speed sensor and the CCU for signs of damage, corrosion, or loose connections.
  • Repair or replace any damaged wires or connectors.

Test Sensor Functionality:

  • Use diagnostic tools to test the functionality of the wheel speed sensor.
  • Ensure the sensor is transmitting accurate data to the CCU.

Update Control Software:

  • Verify that the CCU and RPT control software are updated to the latest versions.
  • Install any available patches or updates that address wheel speed sensor issues.

Consult Technical Support:

  • If the problem persists, consult with technical support or the equipment manufacturer for further assistance.
  • Provide detailed error logs and diagnostic reports to aid in troubleshooting.

Monitor System Performance:

  • After addressing the issue, monitor the system for any recurrence of the fault.
  • Keep detailed records of any further errors or irregularities to assist in ongoing troubleshooting.


The priority of the CCU diagnostic trouble code over the RPT code highlights the importance of resolving issues at the CCU level first. Regular maintenance and inspections of sensors and wiring can prevent such faults from occurring.

Control Units: John Deere

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