John Deere 002042.09 – XSC: CAN BUS Message Fault in Steering Module

A communication failure has been detected on the Controller Area Network (CAN bus) related to the Steering Control module (XSC). The FMI .09 indicates an abnormal update rate, meaning the XSC module is not transmitting or receiving messages as frequently as expected. This indicates a potential issue with data transmission or reception within the steering module's communication system, which can disrupt the functionality of the steering system and related vehicle functions.

• 6R Series
• 7R Series
• 8R Series
• 9R Series
• R-Series Sprayers
• 4000 Series
• 7000 Series
• 8000 Series
• 9000 Series
• Hay cutting equipment

1. 1

   Check battery and system voltage, ensuring the voltage at the steering controller's connector is between 12 and 14 volts

2. 2

   Inspect the wiring harness and all connectors associated with the XSC module for damage, corrosion, moisture intrusion, or loose pins (pay close attention to main power and ground wires)

3. 3

   Measure CAN bus voltages with the ignition on and system active (CAN High should be approximately 2.5 to 3.0 volts; CAN Low should be approximately 2.5 to 2.0 volts)

4. 4

   Measure CAN bus resistance with vehicle power off (should be approximately 60 ohms between CAN High and CAN Low; a reading of 120 ohms indicates a missing terminating resistor or open circuit)

5. 5

   Perform a cold boot by disconnecting power to the tractor, waiting for a short period, and reconnecting it to clear temporary communication glitches

6. 6

   Use a diagnostic scanner to check for other active fault codes in other control units that might indicate a broader network issue

1. 1

   Address voltage issues

   If diagnostic checks reveal low voltage at the XSC module, trace the power supply line from the battery to the controller. Repair any damaged wiring or faulty connectors, and check the relevant fuses for the steering system.

2. 2

   Repair wiring and connectors

   If any damaged wires, corroded pins, or loose connections are found during inspection, repair or replace the affected components. Ensure all connectors are clean, secure, and have a good electrical connection.

3. 3

   Isolate the faulty component

   If CAN bus voltage or resistance readings are incorrect, disconnect one module at a time from the CAN bus and re-check the resistance. When the resistance returns to a normal value (60 ohms) after disconnecting a specific module, that module or its immediate wiring is likely the source of the short or open circuit.

4. 4

   Check terminating resistors

   If the CAN bus resistance measures 120 ohms (indicating an open circuit or missing resistor), inspect the terminating resistors. On John Deere equipment, check the cab's corner post and the implement connector at the rear of the tractor for missing or damaged resistors.

5. 5

   Replace the Steering Control Module (XSC)

   If all wiring and network tests come back normal, the XSC module itself may be faulty. Replace the steering control module.