Fendt 00.0.16 – A050 - ECU, Basic Control Unit: EPC CAN bus fault, Auto mode

Communication failure on the CAN bus specifically affecting the rear Electronic Power Control (EPC) / Electronic Hitch Control (EHR) automatic mode, causing the EPC automatic functions to become non-operable with no display on the instrument cluster or terminal.

• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• Fendt 200 Vario Series (207, 208, 209, 210, 211 V/F/P)
• Fendt 300 Vario Series
• Fendt 400 Vario Series
• Fendt 700 Vario Series (COM III, SCR)
• Fendt 800 Vario Series (COM III, S4)
• Fendt 900 Vario Series (COM III, SCR, Gen6)

1. 1

   Check the CAN High and CAN Low wiring between the A050 Basic Control Unit and the rear EPC/EHR components for chafed wires, corrosion, or loose pins.

2. 2

   Verify that the A050 ECU is receiving proper electronics voltage supply (KL30, KL15) and has a solid earth ground (KL31).

3. 3

   Scan for other A050 or CAN bus-related fault codes (e.g., 00.0.17, 00.0.18) which might indicate a broader network failure rather than an isolated EPC issue.

1. 1

   Clear and Verify

   Attempt to clear the fault code. If it immediately returns, proceed to wiring checks.

2. 2

   Repair Wiring

   If any physical damage is found on the CAN bus lines during the diagnostic checks, repair the wiring harness and re-test.

3. 3

   EOL Programming

   Connect the FENDIAS diagnostic tool to the tractor and perform an EOL flash/reprogramming of the A050 Basic Control Unit.

4. 4

   ECU Repair/Replacement

   If the A050 ECU fails to accept the EOL programming or has suffered internal hardware failure (e.g., burnt EEPROM), remove the unit and send it to a specialized agricultural electronics repair service or replace it with a new OEM unit.

5. 5

   Calibration

   After installing a repaired or new A050 ECU, perform EOL programming and run the calibration routines for the tractor's systems.