John Deere 002003.09 – ICU: CAN BUS Message Fault

This fault code indicates a CAN (Controller Area Network) bus communication error where a specific control unit on the tractor's network has not received an expected message within a predetermined timeframe (abnormal update rate). Depending on the machine, it is typically logged by the Instrument Control Unit (ICU) or Armrest Control Unit (ACU) when data from a transmission controller (PTI/PTP) is missing, or by the Deluxe Hydraulic Control Unit (SCU) when the 'Transmission Current Gear Message' is not received in time. The loss of communication can be caused by a faulty control unit, damaged wiring, or a poor electrical connection.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6135R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7210R
• 7230R
• 7250R
• 7270R
• 7290R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 9230
• 9330
• 9430
• 9530
• 9630

1. 1

   Restart the vehicle to determine if the fault is an intermittent glitch

2. 2

   Check fuses related to the control units (F6 for IVT/AutoPowr, F35 for PowrQuad, or F24 for ECU)

3. 3

   Visually inspect the wiring harness and connectors associated with the Front Chassis Module (PTF) and related control units for damage, corrosion, or loose connections

4. 4

   With vehicle power off, measure CAN bus resistance between CAN_H and CAN_L at the diagnostic connector (expected: ~60 Ohms; a reading of 120 Ohms indicates a missing or damaged terminating resistor)

5. 5

   Monitor the CAN bus state on the machine's display for an increase in 'Passive Error Count', 'BUS Warn Count', or 'BUS Off Count'

1. 1

   Address fuse issues

   If a blown fuse is found, replace it with a new one of the same rating. If the fuse blows again, investigate the wiring or components for a short circuit.

2. 2

   Repair wiring and connectors

   Repair or replace any damaged wires or corroded connectors found during inspection. Ensure all connections are clean and secure.

3. 3

   Address terminating resistor issues

   If the CAN bus resistance is 120 Ohms, locate and test the two 120-Ohm terminating resistors in the circuit. Replace the faulty resistor to restore the 60-Ohm network resistance.

4. 4

   Isolate the faulty module

   If wiring and resistors are in good condition, disconnect modules one by one to see if the fault clears. This will indicate if a specific module is pulling down the network.

5. 5

   Replace the Front Chassis Module (PTF)

   If diagnostics point to the PTF, disconnect the battery to prevent electrical damage and replace the module. Verify that the front PTO system operates correctly after installation.