Fendt 00.0.08 – A024 - ECU, EPC B or A050 - Basic control unit ECU: Bus fault, rear EPC

CAN bus communication to the rear EPC module has been interrupted or is faulty. The rear power lift will not function, and there will be no related information on the display.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• Fendt 300 Vario
• Fendt 400 Vario
• Fendt 700 Vario
• Fendt 800 Vario
• Fendt 900 Vario

1. 1

   Verify the 'Electronics voltage supply' to ensure the rear EPC module is receiving adequate power and ground.

2. 2

   Check the CAN bus wiring harness between the basic control unit (A050 or A002) and the rear EPC module (A024). Look for open circuits, short circuits to ground/power, or severe corrosion at the connectors.

3. 3

   Consult the Fendt 'Electronic lifting gear control' circuit diagram for your specific model to identify the exact pinouts for continuity testing.

1. 1

   Wiring Repair

   If the diagnostic checks reveal damaged wiring, corroded pins, or loose connectors between the main ECU and the EPC B module, repair or replace the affected harness sections.

2. 2

   ECU Testing/Replacement

   If the wiring, power, and ground are all intact, the fault likely lies within the A024 (EPC B) or A050 (Basic control unit) ECU itself. The unit will need to be sent to an agricultural electronics specialist for internal repair, or replaced entirely.

3. 3

   EOL Programming

   If a new or remanufactured ECU is installed, EOL (End of Line) programming must be performed using the FENDIAS diagnostic software to marry the module to the tractor.

4. 4

   Clear Fault Codes

   Once the physical repair is complete, the stored fault code must be cleared. This can be done manually via the instrument panel (pressing buttons A, B, and C or both arrow keys simultaneously) or using FENDIAS diagnostic software for faults stored deep in the A050 basic control unit.