John Deere 002036.09 – ICU: CAN BUS Message Issue With Communication Between the SCC Module and the Main Controller

The system has detected a critical communication breakdown on the CAN bus involving communication between modules. Specifically, the Instrument Control Unit (ICU) has detected an abnormal update rate (missing or infrequent messages) from either the Front PTO Control Unit (PTF) or the Cab Control Unit (CAB). This loss of communication may affect the proper functioning of the affected circuit.

• 7715
• 7815
• 7720
• 7820
• 7920
• 8130
• 8230
• 8330
• 8430
• 8530
• 6x20 Series
• 6x30 Series
• 7x20 Series
• 7x30 Series
• 8x20 Series
• 8x30 Series
• 9x30 Series

1. 1

   Restart the vehicle to see if the temporary communication glitch clears

2. 2

   Check fuses that power the control units (specifically F9, F15, F22, and F35 depending on the model)

3. 3

   Perform a CAN Bus Electrical Health Check with power off: measure resistance between CAN High and CAN Low (should be approximately 60 Ohms; 120 Ohms indicates an open circuit/missing resistor, 0 Ohms indicates a short)

4. 4

   Perform a CAN Bus Voltage Check with power on (engine off): CAN High (Yellow Wire) should be 2.5-3.5V and CAN Low (Green Wire) should be 1.5-2.5V

5. 5

   Visually inspect the wiring harness between the ICU and suspected modules for chafing, pinching, corrosion, or rodent damage

1. 1

   Confirm fault

   After performing initial checks and restarting the machine, confirm that the 002036.09 fault code is still active.

2. 2

   Isolate faulty module

   With power off, disconnect suspected modules (e.g., PTF, CAB) one at a time and re-check CAN bus resistance. If resistance returns to 60 Ohms, the disconnected module or its connector is the source. Alternatively, with power on, disconnect modules to see if the fault clears.

3. 3

   Inspect connectors

   Once a specific module is suspected, closely inspect its connector pins for corrosion, damage, or a loose fit. Re-inspect the wiring harness leading to it.

4. 4

   Replace faulty component

   Repair or replace the definitively identified faulty component, whether it is a section of the wiring harness, a terminating resistor, or a control module.

5. 5

   Program and calibrate

   If a control module such as the ICU or PTF is replaced, it must be programmed and calibrated by an authorized John Deere dealer to function correctly.