John Deere 523811.09 – RPT / BCU: Incorrect CAN BUS Message for Y73 Solenoid, PTO Speed 1

There is a data transfer problem between the PAP (Power Accessory Point) control software and the RPT control software. The RPT control software intermittently or completely fails to receive expected CAN messages from the PAP, indicating a communication failure on the CAN bus.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430

1. 1

   Inspect the CAN bus communication lines between the PAP and RPT modules for loose wires, poor pin fits, or corrosion.

2. 2

   Inspect the wiring and connections specifically for the Y73 Solenoid (PTO Speed 1) circuit for signs of a short, open circuit, or overheating.

3. 3

   Measure the current and voltage levels at the Y73 solenoid to ensure they are within the specified range.

4. 4

   Verify that both the PAP and RPT control software are updated to the latest versions, as software mismatches can cause CAN communication drops.

1. 1

   Physical Inspection

   Start by physically inspecting the wiring harnesses connecting the RPT module, PAP module, and the Y73 PTO Speed 1 solenoid. Look for chafed wires or loose connector pins.

2. 2

   Repair Wiring

   Repair or replace any damaged wires or connectors found in the CAN bus or the solenoid circuit.

3. 3

   Test the Solenoid

   Use a multimeter or John Deere diagnostic tools to test the Y73 solenoid for proper operation. If the solenoid is found to be internally shorted, open, or overheating, it must be replaced.

4. 4

   Update Software

   Install any available patches or updates for the PAP and RPT control software to address known CAN bus communication issues.

5. 5

   Clear and Verify

   Clear the fault codes and test the rear PTO system (specifically engaging PTO Speed 1) to ensure the error does not return and the PTO functions correctly.