John Deere 002170.09 – SCC, SCO, or CCU: CAN BUS Message Fault SCV 10, Front Chassis Module (SCO)

A communication breakdown has been detected on the CAN bus involving Selective Control Valve (SCV) 10 and the Front Chassis Module (SCO). The .09 suffix indicates a communication error, meaning the control unit responsible for SCV 10 is not sending or receiving messages correctly on the network.

• 6R Series
• 7R Series
• 8R Series
• 9R Series

1. 1

   Restart the tractor to see if the intermittent communication fault clears

2. 2

   Check hydraulic fluid level, as low oil can trigger seemingly unrelated hydraulic faults

3. 3

   Inspect fuses related to the hydraulic controllers (SCC, SCO)

4. 4

   Visually inspect the wiring harness and connectors for SCV 10 and the Front Chassis Module (SCO) for chafed wires, broken wires, or corrosion

5. 5

   With the key off, measure CAN bus resistance across CAN high (yellow) and CAN low (green) circuits (should be approximately 60 ohms)

6. 6

   With the key on, measure CAN bus voltages (CAN high should be ~2.6V, CAN low should be ~2.4V)

1. 1

   Isolate faulty component

   Disconnect other SCVs or electronic modules on the same CAN bus circuit one at a time to see if the fault code disappears, isolating the issue to a specific component or the main harness.

2. 2

   Clean connectors

   Disconnect electrical connectors for SCV 10 and the Front Chassis Module. Clean pins and receptacles with electrical contact cleaner and ensure a secure connection.

3. 3

   Test wiring continuity

   Perform a continuity test on the CAN bus wires (yellow and green) between the SCC/SCO and SCV 10 to identify breaks. Check for shorts between the CAN wires and to power or ground.

4. 4

   Swap components for testing

   If another identical SCV is present, swap the electrical connectors between SCV 10 and the known good SCV. If the fault follows the valve, the SCV 10 electronic control is faulty. If it remains on the same circuit, the wiring harness is likely at fault.

5. 5

   Test terminating resistors

   Test the terminating resistors at each end of the CAN network for correct resistance (typically 120 ohms each). Swap them for diagnostic purposes if supported by the machine.

6. 6

   Replace faulty component

   Based on diagnostic findings, replace the SCV 10 valve assembly (electronic portion), the affected section of the wiring harness, or the SCV controller.