Fendt 1.2.CB – EDC (Electronic Diesel Control) / Engine Control Module (Component A021): A021, A020 - Engine control module, pump control unit (injection pump) (EDC) — Fault in CAN communication to pump control unit.

This code indicates a CAN message failure from the Engine Control Module (EDC) to the Injection Pump Control Unit. When this communication is interrupted, the tractor loses enhanced engine control features. As a safety consequence, the engine will typically default to running at idle (approx. 720 RPM) and only the mechanical/foot throttle will be available.

• 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
• Fendt Farmer 400 Vario series
• Fendt Favorit 700 Vario series
• Fendt Favorit 900 Vario series
• Fendt 900 Vario COM III series (916, 920, 924, 926, 930)

1. 1

   Consult the 'EDC control' electrical circuit diagram for your specific tractor model.

2. 2

   Inspect the CAN bus wiring harness between the EDC Control Module (A021) and the Pump Control Unit (A020) for physical damage, chafing, or breaks.

3. 3

   Check the connectors at both the EDC and the injection pump for corrosion, pushed-out pins, or moisture ingress.

4. 4

   Test the CAN-High and CAN-Low lines between the two modules for continuity, and ensure there are no shorts to ground or voltage.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the battery to prevent electrical spikes.

2. 2

   Access Modules

   Locate the EDC Control Module (A021) and the Injection Pump Control Unit (A020) on the engine.

3. 3

   Repair Wiring

   If the diagnostic checks reveal a broken wire or faulty connector on the CAN bus line, repair the wiring harness using appropriate OEM repair connectors (e.g., AMP Superseal or Minitimer connectors).

4. 4

   Component Replacement

   If the wiring harness and connectors test perfectly, the communication failure is internal to either the Pump Control Unit (A020) or the EDC Control Module (A021). The VP44 injection pump control unit is a common failure point. Replace the faulty module as dictated by further module-specific testing.

5. 5

   Reassembly & Clearing Codes

   Reconnect the battery, turn the ignition on, and use FENDIAS (Fendt diagnostic software) to clear the fault code memory.

6. 6

   Test Run

   Start the engine and verify that it responds to the hand throttle and memory buttons, confirming it is no longer locked in the 720 RPM idle state.