Massey Ferguson T136 – Transmission Control Unit (TCU) / Autotronic 5: Transmission Internal Software Issue (TRANS) / Autotronic 5 Faulty internal component

The transmission controller has detected that the transmission is slipping (input speed vs. output speed mismatch of over 10% for more than 700 milliseconds) or the controller itself has suffered an internal hardware/software failure preventing it from calculating these values correctly.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 5400 Series
• 5425
• 5435
• 5445
• 5455
• 5460
• 5600 Series
• 6400 Series
• 6445 through 6499
• 7600 Series
• 8600 Series
• 8700 Series

1. 1

   Check transmission fluid level and ensure the oil is not heavily polluted, which can cause mechanical slippage

2. 2

   Inspect hydraulic filters for blockages, as a blocked high-pressure transmission oil filter can cause pressure drops and clutch pack slippage

3. 3

   Verify power supply by checking battery voltage and the permanent 12V supply to the Autotronic 5 controller (voltage drops below 7V can cause internal errors)

4. 4

   Check for accompanying fault codes like T130 (Low Supply Voltage) or T137/T138 (Braking/Pressure issues) which indicate external sensor or pressure failures

1. 1

   Attempt Calibration

   First, attempt to re-flash the transmission software and perform a full transmission calibration using the Massey Ferguson EDT (Electronic Diagnostic Tool). If the software issue is a soft error, this may clear it.

2. 2

   Disconnect Power

   If the code returns immediately, disconnect the tractor's battery.

3. 3

   Locate the Module

   Locate the Autotronic 5 controller (typically located under the right-hand cab console or under the cab floor, depending on the series).

4. 4

   Remove the Module

   Disconnect the multi-pin wiring harnesses from the Autotronic 5 unit. Remove the mounting bolts and extract the faulty controller.

5. 5

   Install the New Module

   Mount the replacement Autotronic 5 unit and securely reconnect the wiring harnesses.

6. 6

   Program the Module

   Reconnect the battery. You must use the Massey Ferguson EDT dealer software to input the tractor's VIN, configure the parameters for your specific transmission (e.g., Dyna-4 vs. Dyna-6), and perform a complete PowerShuttle and clutch pedal calibration before the tractor will move.