EPC 000084.14 – B09/B35 Wheel Speed Sensor Fault

EPC 000084.14 (EPC 84.14)

Code: 000084.14

Shortcode: 84.14


This error code, EPC 000084.14, indicates that the control unit EPC has registered no wheel speed signal when the transmission is engaged (clutch pedal released) and the reverse drive lever is in either the forward or reverse position. The possible causes for this issue include:

  • A defective wheel speed sensor (B09/B35).
  • An incorrect or missing wheel speed signal received via the CAN BUS.


When this error is detected, the transmission control system may not function correctly, as it relies on accurate wheel speed information to manage gear shifts and overall transmission performance. This can lead to improper operation or reduced functionality of the tractor.


Inspect and Replace Wheel Speed Sensors:

  • Check the condition and functionality of the wheel speed sensors (B09/B35). Replace them if they are found to be defective or damaged.

Verify CAN BUS Signal Integrity:

  • Inspect the CAN BUS wiring and connections for any signs of damage, loose connections, or corrosion. Ensure that the signals being transmitted are accurate and without interference.

Check for Wiring Issues:

  • Examine the wiring between the wheel speed sensors and the control unit for any potential issues such as breaks, shorts, or loose connections. Repair or replace any faulty wiring.

Test the Sensors and Signal Transmission:

  • Use diagnostic tools to test the wheel speed sensors and monitor the signals being transmitted to the control unit. Ensure that the sensors are correctly transmitting wheel speed data.

Recalibrate or Reset System:

  • After addressing sensor or wiring issues, recalibrate the system or perform a system reset to ensure that the control unit correctly registers wheel speed data.


Regular maintenance and inspection of the wheel speed sensors and the CAN BUS system are essential to prevent such faults. Ensuring proper signal transmission and sensor functionality is crucial for the optimal operation of the transmission system. If issues persist, further diagnostic checks may be necessary to identify deeper underlying problems.

Control Units: John Deere

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