John Deere 523811.04 – RPT (Rear Chassis / Rear PTO Control Unit) or BCU (Basic Control Unit) / PAP (Power Accessory Point): Rear PTO Speed 1 Solenoid High Amp Draw / Solenoid for PTO Speed 1 On, Current Too High

This code is triggered when the control software measures an excessively high electrical current (amperage) at the output to the "Y73" solenoid, which controls Rear PTO Speed 1. This typically indicates a short circuit to ground in the wiring harness or an internal short within the solenoid coil itself, causing it to draw more power than the circuit allows. When this fault is active, the rear PTO functionality is usually restricted or entirely disabled to protect the circuit.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230R
• 6250R
• 6110M
• 6120M
• 6130M
• 6140M
• 6145M
• 6155M
• 6175M
• 6195M
• 6230
• 6330
• 6430
• 7130
• 7230
• 7430
• 7530
• 6100D
• 6105E
• 6110E
• 6120E

1. 1

   Visually inspect the wiring harness and connectors leading to the Y73 PTO Speed 1 solenoid for chafed wire insulation, melted connectors, or pinched wires that could cause a short to ground.

2. 2

   Use a multimeter to test the internal resistance of the Y73 solenoid coil. A reading of near-zero ohms indicates an internal short.

3. 3

   Use a diagnostic tool to measure the live current draw when the solenoid is commanded on.

4. 4

   Verify that the power module (PC5) supplying the solenoid is outputting the correct voltage and is not internally shorted.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical spikes during repair.

2. 2

   Locate the Component

   Locate the rear PTO valve block on the rear chassis. Identify the Y73 solenoid (PTO Speed 1).

3. 3

   Harness Repair (If Applicable)

   If the diagnostic checks revealed a short to ground in the wiring, repair the damaged section of the harness using OEM-approved weather-sealed splices, or replace the connector pigtail.

4. 4

   Replace the Solenoid

   If the wiring is intact but the solenoid is drawing high amperage, the solenoid valve is defective. Disconnect the electrical plug, remove the retaining fastener, and extract the solenoid valve assembly from the block.

5. 5

   Install New Part

   Lubricate the O-rings on the new solenoid valve with clean hydraulic fluid. Install it into the valve block and torque to OEM specifications. Reconnect the electrical harness.

6. 6

   Software Update

   Ensure the PAP/BCU control software is updated to the latest version, as some updates contain patches that address current regulation and overload protection logic.

7. 7

   Clear and Test

   Reconnect the battery, clear the 523811.04 fault code using a diagnostic tool, and engage PTO Speed 1 to verify the repair.