John Deere 523811.01 – RPT (Rear Chassis / Rear PTO) / BCU (Basic Control Unit) / PAP (Power Accessory Point) / Power Module PC5: Supply Voltage Fault for the Y73 Solenoid (PTO Speed 1)

The control software measures a supply voltage of less than 1 V (or less than 3 V, depending on the specific module generation) at the output to the PTO Speed 1 solenoid when it is commanded on. This low voltage condition prevents the solenoid from activating properly, resulting in the rear PTO being significantly limited or entirely non-functional.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230R
• 6250R
• 6230
• 6330
• 6430
• 6530
• 6630
• 6830
• 6930
• 6105M
• 6195M
• 6M Series
• 6MC Series
• 6030 Premium Series

1. 1

   Inspect the Supply Voltage Circuit: Physically check the wiring harness and connectors leading to the Y73 solenoid (PTO Speed 1) for signs of chafing, corrosion, or an open circuit.

2. 2

   Check Power Module Fuses: Verify the fuses supplying the PC5 power module or RPT controller (e.g., F02 PLB/01 and 02) are intact, as a blown fuse will cause a total voltage drop.

3. 3

   Test Voltage Levels: Use a multimeter to measure the voltage at the solenoid connector when the PTO is activated. It should read standard system voltage (approx. 12V). If it is below 1V-3V, the issue is in the wiring or the controller output.

4. 4

   Verify Solenoid Operation: Test the Y73 solenoid's resistance (ohms) to ensure the internal coil is not shorted or open, which could drag down the circuit voltage.

1. 1

   Repair Wiring

   If the diagnostic checks reveal damaged wires or corroded pins at the solenoid connector, repair or replace the affected harness section.

2. 2

   Replace the Solenoid

   If the wiring and module outputs are healthy but the Y73 solenoid fails a bench test or resistance check, replace the PTO Speed 1 solenoid valve.

3. 3

   Update Control Software

   Ensure the PAP/RPT control software is updated to the latest version, as patches have been released to address overly sensitive voltage regulation and current overload protection issues.

4. 4

   Clear and Test

   Clear the 523811.01 code using a diagnostic tool and engage the rear PTO to verify the voltage drop does not return and the PTO engages smoothly.