New Holland ENG 3420 – Engine Control Module (ECM / EDC) or Vehicle Control Module (VCM): CAN Bus Communication - CAN Bus Received Frames: DFC of Auxiliary Engine Shutdown Switch Message

This fault code does not indicate an internal engine failure. Instead, it is an informational code indicating an external engine shut-off request. The engine control system received a specific CAN Bus message (BC2EDC2) from another module on the network, commanding the engine to shut down.

• T5
• T6
• T7
• T8
• T9
• W50C
• W60C
• W70C
• W80C
• New Holland Skid Steers
• New Holland Compact Track Loaders
• Case 21F
• Case 121F
• Case 221F
• Case 321F

1. 1

   Check for other codes: Do not attempt to repair the engine. Check the Body Computer and other modules for active fault codes that would have initiated the shutdown request.

2. 2

   Check the Auxiliary Shutdown Switch: Verify if the machine's physical emergency stop / auxiliary shutdown switch was manually pressed, or if it is physically damaged.

3. 3

   Inspect CAN Bus Integrity: If no switch was pressed, check the CAN Bus wiring between the Body Computer and the ECM for a defective CAN controller, disconnected cables, or short circuits.

1. 1

   Connect diagnostic tool

   Connect a diagnostic service tool (e.g., New Holland Electronic Service Tool) to the machine's diagnostic port.

2. 2

   Perform network scan

   Perform a full network scan to read all active and stored fault codes across all modules, paying special attention to the Body Computer.

3. 3

   Locate root cause code

   Locate the root cause code (Fid_EngShOff) that triggered the shutdown request.

4. 4

   Inspect auxiliary shutdown switch

   If the machine is equipped with an auxiliary engine shutdown switch (E-Stop), inspect the switch and its wiring harness. Test the switch for internal shorts or open circuits using a multimeter.

5. 5

   Inspect CAN Bus lines

   If the switch is functioning correctly, inspect the CAN Bus communication lines between the Body Computer and the Engine VCM/ECM. Check for disconnected cables, broken wires, or short circuits.

6. 6

   Repair or replace components

   Repair or replace any damaged wiring harnesses, or replace the defective auxiliary shutdown switch if it is internally shorted.

7. 7

   Clear codes and verify

   Clear the fault codes from all modules and cycle the key to verify the code does not return and the engine runs normally.