John Deere 2169.09 – SCC (Selective Control Valve Control Unit / Rear Chassis Controller): SV IX Message Missing

The SCC (Selective Control Valve Control Unit / Rear Chassis Controller) has lost Controller Area Network (CAN) bus communication with the electronic module that controls SCV 9 (Source Address 169).

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 9470RT
• 9520RT
• 9570RT

1. 1

   Cycle the key switch off and back on to see if the communication loss is a hard fault or an intermittent software glitch.

2. 2

   Disconnect the harness at SCV 9 and verify 12V power and a solid ground using a multimeter. If the module loses power or ground, it will stop transmitting CAN messages.

3. 3

   Inspect the SCV 9 electrical connector and harness for corrosion, moisture, or pushed-back pins.

4. 4

   With the battery disconnected, measure the resistance across the CAN High and CAN Low pins at the SCV 9 connector. A healthy CAN bus should read approximately 60 ohms. Check for shorts to ground or power on the CAN lines.

5. 5

   Check for multiple codes. If other SCVs (e.g., SCV 7 or SCV 8) are also reporting 'Message Missing' codes, the issue is likely a damaged main CAN bus harness or a faulty terminating resistor rather than the SCV itself.

1. 1

   Safety First

   Park the tractor on a level surface, lower all implements to the ground, turn off the engine, and relieve all hydraulic pressure by cycling the SCV levers/controls.

2. 2

   Access the Valve Stack

   Locate the rear SCV valve stack on the rear chassis. Identify SCV 9 (usually the outermost or highest-numbered valve in the block, depending on the machine's configuration).

3. 3

   Clean the Area

   Thoroughly clean the area around the SCV to prevent dirt from entering the hydraulic system during removal.

4. 4

   Disconnect Electrical and Hydraulic Lines

   Unplug the CAN/power electrical connector from the SCV 9 module. Disconnect the hydraulic lines attached to the valve and immediately cap all open ports and hoses to prevent contamination.

5. 5

   Remove the SCV

   Unbolt the SCV 9 slice from the hydraulic valve stack.

6. 6

   Install the New SCV

   Mount the replacement SCV unit to the stack, ensuring all O-rings are properly seated. Torque the mounting bolts to the OEM specification.

7. 7

   Reconnect

   Reattach the hydraulic lines and plug in the electrical connector.

8. 8

   Calibration

   Power on the tractor. The new SCV module will likely need to be calibrated and assigned its specific network address (Source Address 169) using John Deere Service ADVISOR software so the SCC recognizes it as SCV 9.