John Deere 002140.09 – SCC: CAN BUS Message Fault in Rear Chassis

A communication breakdown has occurred on the Controller Area Network (CAN bus) indicating that a control unit is not receiving expected messages from the Rear Chassis Controller (SCC). The SCC, which manages the hydraulic selective control valves (SCVs), has stopped transmitting data or its messages are not being received. This condition is typically caused by a loss of power or ground to the controller, or a physical fault within the CAN bus wiring itself.

• 6110M
• 6120R
• 6150R
• 6155R
• 6M Series
• 6R Series
• 7R Series
• 8R Series
• 8RT Series
• 9R Series
• 9RT Series
• 9RX Series

1. 1

   Check vehicle battery voltage to ensure it is stable and within specification, and consider disconnecting the battery for 30-60 seconds to reset controllers

2. 2

   Inspect the controller power and ground connections, specifically looking for a broken eyelet on the ground wire at the battery terminal (a known issue on 6R series)

3. 3

   Visually inspect all accessible CAN bus wiring harnesses and connectors between main controllers and the SCC for signs of corrosion, dirt, moisture intrusion, or physical damage such as rodent damage, chafing, or pinched wires

4. 4

   Verify that all fuses related to the SCC and other chassis controllers are intact

5. 5

   Perform a CAN bus resistance check with the ignition off and network asleep by measuring across CAN High and CAN Low (typically pins C and D at the diagnostic connector) - a healthy network should read approximately 60 Ohms

1. 1

   Isolate the fault

   If initial checks do not reveal the problem, disconnect controllers from the CAN bus one at a time to see if normal communication and the 60 Ohm resistance reading are restored.

2. 2

   Confirm power and ground at the controller

   Locate the Rear Chassis Controller. Using a multimeter, check for consistent battery power and a solid ground connection directly at the controller's main connector.

3. 3

   Repair wiring

   If a broken wire, corroded pin, or failed ground connection is found, repair it. For a broken ground eyelet, strip the wire, crimp on a new terminal, and protect it with heat shrink tubing. If a section of the harness is damaged, either run new, appropriately gauged wires or replace the affected harness section.

4. 4

   Replace the Rear Chassis Controller

   If all wiring, power, and ground connections are confirmed to be good, the Rear Chassis Controller (SCC) has likely failed and must be replaced.

5. 5

   Clear codes and verify repair

   Reconnect the battery, clear all diagnostic trouble codes, and operate the machine. Test the hydraulic SCV functions controlled by the SCC to confirm they are operating correctly.