Massey Ferguson 04.01.8F – TRANS (Transmission Control Module / ECU): Issue With Tyre Size Configuration

The tractor's electronic system has detected an invalid, missing, or mismatched tire size parameter in its memory. The tractor relies on the exact rolling circumference of the tires to accurately calculate ground speed, manage 4WD engagement, calculate wheel slip (if equipped with radar), and optimize transmission shifting. This fault often triggers after a battery disconnect, software update, or if the tire size parameters were incorrectly modified.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)

1. 1

   Verify if the tractor's tires were recently replaced or if the wheel setup/rims were changed for different row crop spacings

2. 2

   Access the Datatronic terminal or instrument cluster to view the currently programmed tire size and rolling circumference

3. 3

   Read the physical tire size on the rear sidewalls and consult the tire manufacturer's spec sheet for the exact rolling circumference in millimeters

4. 4

   Determine if the tractor recently suffered a dead battery or underwent an ECU software flash, which may have wiped the volatile memory of the TRANS module

1. 1

   Turn on Ignition

   Power on the tractor's electrical system without starting the engine.

2. 2

   Access Configuration Menu

   Using the Datatronic terminal (or the dashboard display menus), navigate to the Vehicle Settings or Transmission Configuration menu.

3. 3

   Input Tire Data

   Locate the "Tyre Size" or "Rolling Circumference" parameter. Enter the correct rolling circumference value (in millimeters) that matches the physical rear tires installed on the tractor.

4. 4

   Save and Cycle Power

   Save the configuration. Turn the ignition key to the OFF position, wait 30 seconds for the modules to power down and save the data, and then turn the key back ON.

5. 5

   Clear the Code

   Clear the inactive 04.01.8F fault code from the system.

6. 6

   Radar Calibration (If Equipped)

   If the tractor is equipped with radar and slip control, perform a radar calibration run in the field to synchronize the true ground speed with the newly entered tire size data. Note: If the configuration will not save or the code immediately returns, a dealer may need to use the AGCO Electronic Diagnostic Tool (EDT) to re-flash the Transmission Controller.