John Deere 002047.09 – Dash: Missing Main Control Module CAN Data

The Dash Module is not receiving expected data messages from the Main Control Module at the correct interval over the CAN bus network. This indicates a communication breakdown between the two modules, triggering an abnormal update rate fault (SPN 2047, FMI 9).

• 7220
• 7320
• 7420
• 7520

1. 1

   Check for other active CAN bus codes to determine if the issue is systemic across the network or isolated to these specific modules

2. 2

   Inspect the fuse supplying power to the CAN bus system (fuse F04/13 on 7x20 series tractors)

3. 3

   Visually inspect wiring harnesses and connectors between the Dash Module and Main Control Module for chafing, pinching, or corrosion

4. 4

   Verify the Main Control Module has a stable voltage supply and a solid ground connection, as low system voltage can cause communication faults

5. 5

   Check CAN bus terminating resistors (A14 and A15 on 7x20 series) - resistance between CAN High and CAN Low should be approximately 60 ohms

6. 6

   Inspect the integrity of the CAN bus shield wires (lines 930 and 932 on 7x20 tractors)

1. 1

   Repair wiring and connections

   Repair or replace any corroded connectors, loose pins, or damaged wires found during inspection. Disconnect and reconnect the module connectors to resolve potential intermittent connection issues.

2. 2

   Test CAN bus voltages

   Measure voltages on the CAN network to ensure wiring is sound. The CAN High wire (typically yellow) and CAN Low wire (typically green) should both measure approximately 2.5V.

3. 3

   Isolate faulty module

   If wiring and voltages are good, swap the suspect module (Main Control Module or Dash Module) with a known good unit from another machine to see if the communication problem follows the module.

4. 4

   Replace and program module

   Replace the faulty control module. Use John Deere Service ADVISOR software to program or configure the new module after installation.

5. 5

   Clear codes and verify

   Clear all diagnostic trouble codes from the system and operate the machine to ensure the fault does not return.