Massey Ferguson T259 – TRANS: Internal Transmission Module Failure

The tractor's onboard diagnostic system has detected a fatal internal hardware or software failure within the transmission control unit. Specifically, this refers to an internal component failure of the Autotronic 5 controller (designated in wiring diagrams as component X473).

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

1. 1

   Verify system voltage from the battery and alternator. The Autotronic 5 module requires a stable voltage between 11V and 16V; voltage spikes or drops can trigger internal module faults.

2. 2

   Inspect the main harness connector (X473) at the Autotronic 5 module for corrosion, moisture ingress, or bent terminals.

3. 3

   Check power and ground connections, specifically the main earth terminal (X476), ensuring there are no short circuits in the wiring harness leading to the module.

4. 4

   Clear the fault codes using a diagnostic tool (like the Massey Ferguson EDT or Jaltest), cycle the key, and operate the transmission to see if T259 returns as an active hard code. If it returns immediately, the module is permanently damaged.

1. 1

   Disconnect power

   Disconnect the negative battery cable to prevent electrical arcing or further damage.

2. 2

   Remove the module

   Locate the Autotronic 5 Transmission 2 controller (usually located in the right-hand console or under the cab floor, depending on the specific series).

3. 3

   Disconnect harnesses

   Carefully unplug connector X473 and any secondary CAN bus connectors.

4. 4

   Swap the unit

   Unbolt the faulty module and mount the replacement Autotronic 5 unit.

5. 5

   Reconnect wiring

   Plug in all wiring harnesses securely and reconnect the battery.

6. 6

   Program and calibrate

   Connect a dealer-level diagnostic tool to flash the correct software for your specific tractor model, transmission type, and optional equipment, followed by a full transmission calibration.