Massey Ferguson 04.03.16 – Transmission Controller (TRANS) / Autotronic 4 or 5: Transmission Module Low Supply Voltage (TRANS)

The transmission controller is experiencing an internal or external power failure where the supply voltage (often the internal +5V or +8V regulator, or the external 12V battery signal) has dropped below the acceptable lower limit.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 8600 Series

1. 1

   Check the battery voltage using a multimeter (a healthy battery should read approximately 12.6V)

2. 2

   Check the alternator regulator output to ensure the charging system is providing adequate voltage

3. 3

   Inspect the physical wiring harness, focusing on the power and ground connections going directly to the transmission controller

4. 4

   Connect the diagnostic service tool, open the MONITOR window, and select 'TRANS BATTERY VOLTAGE' to see the voltage the controller is reading

1. 1

   Verify Power Source

   Start by testing the battery and alternator. If the battery is weak or the alternator is failing to charge, replace them and clear the code to see if the issue resolves.

2. 2

   Inspect Harness Connections

   Disconnect the main harness to the transmission controller. Clean the contacts and check for corrosion, bent pins, or frayed wires that could cause a voltage drop. Reconnect securely.

3. 3

   Test Controller Power/Ground

   Using a multimeter, probe the power and ground pins on the harness side of the transmission controller connector to verify that full system voltage (12V+) is reaching the module.

4. 4

   Replace the Controller

   If the battery, alternator, and wiring harness all supply the correct voltage levels but the code persists, the controller's internal +5V or +8V regulator has failed. You must replace the transmission controller (Autotronic module).

5. 5

   Reprogramming

   Program/calibrate the new Autotronic transmission controller via the dealer service tool to sync with the tractor's specific configuration.