Fendt A.1.CB – A034 - Joystick (Drive switch) / A002 - ECU, Enhanced Control (E-Box): CAN joystick not available (CAN bus fault)

The tractor's electronic control system has lost CAN bus communication with the main driving joystick (A034). When this fault is active, the system defaults to an emergency operating mode, and the primary consequence is that the auxiliary hydraulic valves cannot be operated.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• 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
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III) / Farmer 400
• Fendt 700 Vario (COM III) / Favorit 700 (e.g., 711, 712, 714, 716)
• Fendt 800 Vario (COM III) (e.g., 815, 817, 818, 820)
• Fendt 900 Vario (COM III) / Favorit 900 (e.g., 916, 920, 924, 926, 930)

1. 1

   Check fuse F047 on circuit board A013, which supplies power to the joystick's CAN bus

2. 2

   Inspect the wiring harness and connectors between the A034 Joystick and the A002 Enhanced Control ECU (E-Box) for line discontinuities, pinched wires in the armrest, or loose/corroded pins

3. 3

   Check for related fault codes, specifically A.1.CC, which indicates a faulty CAN connection between the E-Box and the CAN joystick

4. 4

   Use the FENDIAS dealer diagnostic tool to check the A034 drive switch data transfer and verify if the module is visible on the network

1. 1

   Power Down

   Turn off the tractor ignition and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Fuse Replacement

   If fuse F047 on board A013 is blown, replace it. Reconnect power and test. If the fuse blows immediately, trace the joystick harness for a short to ground.

3. 3

   Harness Repair

   If the wiring between the armrest joystick (A034) and the ECU (A002) is damaged, repair the broken wires or replace the damaged section of the harness.

4. 4

   Component Repair/Replacement

   If the wiring and power supply are intact but communication is still dead, the A034 joystick has likely suffered an internal electronic failure. Remove the defective joystick and either install a replacement OEM joystick or send the unit to a specialized agricultural mechatronics repair service.

5. 5

   EOL Programming

   After resolving the communication issue or replacing the joystick, run new EOL (End of Line) programming using the FENDIAS diagnostic tool to re-initialize the joystick on the tractor's CAN network.