Fendt B.1.41 – A002 - ECU, enhanced control: "Internal communication Teach-in" error counter overflow

This fault code indicates a CAN bus communication error or data transfer fault related to the Variotronic TI (Teach-in) automatic operation system. The error counter for internal communication has exceeded its limit, resulting in the Teach-in function being disabled (Variotronic TI automatic operation does not function).

• 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
• Farmer 400
• Favorit 700 / Favorit 900
• Fendt 300 Vario (COM III)
• Fendt 400 Vario (COM III)
• Fendt 700 / 800 / 900 Vario (COM III)

1. 1

   Check for accompanying bus faults, particularly B.1.42 (Error counter overflow between A008 terminal and Teach-in) or B.1.12 (Electrical fault in TI automatic operation), which point to the same communication circuit.

2. 2

   Check the voltage supply for the CAN-Bus on the A013 fuse board, specifically testing fuses F040 and F041.

3. 3

   Inspect the CAN bus wiring and connectors between the A002 ECU (Enhanced Control) and the A008 Vario Terminal for breaks, corrosion, or loose pins.

4. 4

   Consult Chapter 9700 Reg. A - Principle of Variotronic TI operation ('Teach-in') in the Fendt workshop manual for specific pinout testing.

1. 1

   Clear the Code

   Attempt to confirm and clear the fault code from the tractor's memory (press and hold the clear key on the terminal). If the fault is a hard failure, the code will repeat periodically.

2. 2

   Resolve Power Issues

   If fuses F040 or F041 on the A013 board are blown, replace them and retest the Teach-in function.

3. 3

   Repair CAN Bus Wiring

   If physical damage or high resistance is found in the wiring harness between the A002 ECU and the A008 terminal, repair the wiring using OEM-approved CAN bus splicing methods or replace the affected harness section.

4. 4

   Software / EOL Programming

   If the wiring and power supply are intact, the A002 ECU may have suffered a software corruption (EPROM fault). The module may require End-Of-Line (EOL) reprogramming or a flash update by a dealer.

5. 5

   Module Replacement

   If reprogramming fails or the A002 ECU has an internal hardware failure, replace the A002 E-Box and program it to the tractor.