Massey Ferguson T128 – Autotronic 5: Transmission Internal Software Issue (TRANS)

Program without parameters or calibration, or EEPROM failure. The transmission controller has lost its programmed parameters/calibration data, or the internal EEPROM memory chip has physically failed and can no longer save data, causing the tractor to restrict itself to a default or limp mode.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 5400 Series
• 5425
• 5445
• 5455
• 5600 Series
• 6400 Series
• 7400 Series
• 7600 Series

1. 1

   Check system voltage: Verify that the battery voltage and the electrical power supply to the Autotronic 5 controller (+APC ignition) are stable and not dropping below 7V during cranking.

2. 2

   Check for accompanying codes: Look for code T129 or T130, which point to power supply issues rather than a dead controller.

3. 3

   Attempt recalibration: Attempt to rewrite the parameters to the EEPROM before replacing any modules.

1. 1

   Connect diagnostic tool

   Connect the diagnostic tool (e.g., Wintest or dealer equivalent) to the tractor.

2. 2

   Execute programming and calibration

   Execute a complete transmission programming procedure, parameter adjustment, and calibration.

3. 3

   Perform PowerShuttle calibration

   Specifically, perform the PowerShuttle calibration.

4. 4

   Cycle key

   Cycle the key to allow the Autotronic 5 controller to save the new parameters to the EEPROM.

5. 5

   Verify calibration

   Turn the tractor back on. If the calibration holds and the code clears, the issue was a software corruption anomaly.

6. 6

   Replace controller

   If the EEPROM operation fails immediately, or if the T128 code returns upon the next startup, the internal memory of the Autotronic 5 controller has permanently failed. You must remove and replace the Autotronic 5 controller.

7. 7

   Program new controller

   Install the new controller and perform a full parameter download and PowerShuttle calibration to marry it to the tractor.