John Deere 000084.09 – SCC: CAN BUS Message Fault in Rear Chassis

A communication breakdown has occurred on the CAN bus related to the rear chassis. The .09 Failure Mode Identifier (FMI) indicates a missing message, meaning the SCV CAN Controller (SCC) has stopped sending or receiving critical data to other control units on the network. This disruption affects systems connected to the rear chassis and can lead to symptoms ranging from dash warning lights to the failure of hydraulic functions or the tractor refusing to stay in gear.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6140R
• 6150R
• 6170R
• 6190R
• 6210R

1. 1

   Restart the tractor to see if the code clears, as it may be an intermittent communication issue.

2. 2

   Visually inspect the wiring harnesses connected to the rear chassis controllers, particularly around the SCC, looking for chafing, corrosion on connectors, rodent damage, or a loose/corroded ground wire.

3. 3

   Check the battery and power supply to ensure terminals are clean and tight; low or unstable system voltage can disrupt CAN bus communications.

4. 4

   Inspect the fuses related to the SCC and other controllers on the rear chassis.

5. 5

   Perform a CAN Bus Resistance Check: Disconnect the battery, locate the diagnostic connector, and measure resistance between the CAN High (yellow wire) and CAN Low (green wire) pins. A healthy bus reads approximately 60 Ohms. 120 Ohms indicates a missing/failed terminating resistor, 0 Ohms indicates a short circuit, and an open circuit/high resistance points to a wiring break or both resistors being disconnected.

1. 1

   Isolate the faulty component

   If the resistance check indicates a problem, unplug controllers one at a time from the CAN bus and re-measure the resistance. When the resistance returns to the correct value after unplugging a specific component, that component or its connector is likely the cause.

2. 2

   Check and replace terminating resistors

   Visually inspect the active and passive terminating resistors at each end of the main harness and their connectors for damage or corrosion. If a resistor is suspected to be faulty based on a 120 Ohm resistance check, replace it.

3. 3

   Repair wiring and connectors

   If visual inspection reveals damaged wiring or connectors, repair them. This may involve repairing a broken wire, replacing a corroded connector pin, or securing a loose connection (such as a broken eyelet on a ground wire).

4. 4

   Replace faulty controller

   If diagnostic checks point to a specific controller (like the SCC) as the source of the fault and all wiring and connections have been verified as good, the controller itself has likely failed and must be replaced.

5. 5

   Consult Official Service Manuals

   For detailed wiring diagrams and specific diagnostic procedures for your tractor model, it is highly recommended to consult the official John Deere service manual, such as TM403919 for the 6140R-6210RE models.