John Deere 002240.09 – RPT: RPT CAN Bus Communication Loss

The system has detected a communication issue with the CAN BUS message between the Cab Module Main Control Module and the Rear PTO Control Unit (RPT). This indicates that the Instrument Control Unit (ICU) or other primary control modules on the vehicle's Controller Area Network (CAN) are not receiving expected messages from the RPT. This loss of communication can lead to the malfunction of systems that rely on data from the RPT module.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M

1. 1

   Restart the vehicle to see if the code clears, which may indicate an intermittent issue

2. 2

   Visually inspect the wiring harnesses and connectors associated with the RPT module and the main CAN bus for chafing, pinching, or corrosion

3. 3

   Check relevant fuses for the control modules

4. 4

   Perform a CAN Bus Resistance Check: With power off and battery disconnected, measure resistance between CAN High and CAN Low at a diagnostic connector (Expected: ~60 ohms. ~120 ohms indicates an open circuit or missing terminating resistor; significantly lower indicates a short or extra resistor)

5. 5

   Perform a CAN Bus Voltage Check: With power on (engine off), check CAN High (yellow wire) to ground (Expected: ~2.5V to 3.0V) and CAN Low (green wire) to ground (Expected: ~2.0V to 2.5V)

1. 1

   Isolate faulty component

   If CAN bus resistance or voltage is incorrect, unplug control modules one by one to see if the readings return to normal. This helps identify a faulty module that may be disrupting the network.

2. 2

   Repair harness and connectors

   If damaged wiring or corroded connectors are found during inspection, repair or replace them as necessary. Ensure all connections are clean and secure.

3. 3

   Replace terminating resistors

   If the resistance check indicated a faulty 120-ohm terminating resistor, locate it using the relevant service manual and replace it.

4. 4

   Replace RPT module

   If the RPT module itself is determined to be faulty, replace it. The new module may require programming by a John Deere dealer after installation.