Case IH 5023 – Rear PTO (RPTO) Control Module / Tractor Control Unit (TCU): PTO clutch lube solenoid circuit shorted to B+ [Battery Voltage] when PTO is in the off state. (4WD Only)

The controller is detecting unexpected battery voltage on the PTO clutch lubrication solenoid circuit when the Power Take-Off (PTO) switch is turned off, indicating a short circuit to power.

• MAXXUM T4E
• Case IH Magnum Series
• Case IH STX Steiger Series

1. 1

   Verify power supply to check if an external power supply is improperly connected or if the tractor's charging system is faulty and over-voltaging

2. 2

   Test the PTO lube solenoid resistance with the ignition OFF (should be 8 to 11 Ohms between terminal 1 and 2)

3. 3

   Check the wiring harness between the TCU and the PTO solenoid for rubbed wires causing a short to battery power (check for +12 volts at TCU connectors with ignition ON)

4. 4

   Test the Tractor Control Unit (TCU) for an internal fault sending constant power to the circuit

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Replace Faulty Component

   If the solenoid failed the 8-11 Ohm resistance test, remove the retaining hardware holding the PTO lube solenoid valve in the transmission/PTO valve block and install a new solenoid. If the harness was found to be shorted to a power wire, repair the damaged section of the wiring harness and apply heat-shrink tubing/loom.

3. 3

   Reassemble and Reconnect

   Plug the solenoid connector back in and reconnect the battery.

4. 4

   Clear Codes

   Use an Electronic Service Tool (EST) or the tractor's diagnostic display to clear the 5023 error code.

5. 5

   Test Operation

   Start the engine and test the PTO system for normal operation, ensuring the code does not return when the PTO is switched off.