New Holland DCU 19579 – DCU: CAN receive frame E2SCR (Dosing, Exh gas flow, Exh gas temp, Error Suppression, Heater, Long Term failure) _timeout _P0600 Serial Communication Link

This indicates a CAN bus communication timeout. Specifically, the control module is failing to receive the "E2SCR" data frame over the network. The underlying SAE diagnostic trouble code is P0600, which is a generic code for a Serial Communication Link failure.

• T6
• T7
• T8
• T9
• W190B
• W270C
• W300C
• FR450
• FR500
• FR600
• CX series

1. 1

   Check for other active CAN bus errors (such as 19580 or 19581) or Engine ECU faults using a diagnostic scanner (CNH EST). Multiple CAN timeouts usually point to a physical wiring issue.

2. 2

   Inspect the CAN bus wiring harness between the DCU and the Engine Control Unit (ECU) for chafing, breaks, or melted wires near the exhaust system.

3. 3

   Disconnect the DCU and ECU connectors to check for pushed-back pins, bent pins, moisture, or corrosion. Ensure the fit is tight.

4. 4

   Measure the resistance of the CAN High and CAN Low wires between the DCU and ECU to ensure there is no open circuit or short to ground/power.

5. 5

   Verify that the DCU is receiving proper supply voltage and has a solid ground connection. A drop in voltage can cause the module to drop off the CAN network.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical spikes during testing.

2. 2

   Access the Modules

   Locate the DCU and the Engine ECU.

3. 3

   Clean and Reseat

   Disconnect the wiring harness connectors at both modules. Clean the connectors with electrical contact cleaner if any minor corrosion or moisture is present.

4. 4

   Repair Wiring

   If the continuity test reveals a broken wire or short in the CAN bus lines, repair the wiring harness or replace the affected harness section.

5. 5

   Reassemble

   Reconnect all connectors securely, ensuring the locking mechanisms fully engage.

6. 6

   Clear Codes

   Reconnect the battery and turn the key to the ON position. Connect the CNH EST diagnostic tool and clear the inactive fault codes.

7. 7

   Test Run

   Run the machine to verify if the code returns.

8. 8

   Module Replacement

   If the wiring is 100% verified (good continuity, no shorts, proper power/ground) and the code remains active, the DCU itself likely has an internal CAN transceiver failure and must be replaced. (Note: Replacing the DCU requires flashing/software installation via the CNH EST tool; it is not plug-and-play).