Fendt 1.1.B0 – A050 / A051: A050 - ECU, basic control unit; A051 - ECU, engine control unit (EDC 7). CAN bus communication and function restricted.

The tractor's internal network has detected a communication failure or restriction on the CAN bus linking the basic control unit to the engine control unit. This results in restricted engine function (emergency/limp mode) and torque limitation.

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• 300 Vario Series: 309, 310, 311, 312
• 400 Vario Series: 409, 410, 411, 412
• 700 Vario Series: 711, 712, 714, 715, 716, 717
• 800 Vario Series: 815, 817, 818
• 900 Vario Series: 916, 920, 924, 926, 930, 933, 936

1. 1

   Check the CAN bus wiring harness and connectors between the A050 Basic Control Unit and the A051 Engine Control Unit (EDC 7) for physical damage, corrosion, or loose pins.

2. 2

   Verify that both the A050 and A051 modules are receiving proper power and ground supplies.

3. 3

   Connect FENDIAS or SERDIA diagnostic software to read the fault directly from the A050 and A051 modules, as confirming via the terminal display only hides the message.

1. 1

   Disconnect Power

   Disconnect the battery before servicing any ECU wiring or connectors.

2. 2

   Repair Wiring

   If diagnostic checks revealed damaged CAN bus wiring between A050 and A051, repair the harness or replace the damaged connector pins.

3. 3

   EOL Reprogramming

   If the wiring is intact, the official Fendt remedy is 'EOL (End-of-Line) reprogramming necessary'. Connect the FENDIAS or SERDIA diagnostic tool to the tractor.

4. 4

   Load Data Record

   Perform the EOL reprogramming for the A050 and A051 modules to restore proper CAN communication parameters or load a new data record.

5. 5

   Clear Faults

   Use the SERDIA diagnostic software to permanently delete the fault codes from the A050 and A051 memory.

6. 6

   Test Drive

   Restart the tractor and verify that full engine function and torque are restored and that the fault code does not return.