Case IH 5008 – Transmission Control Module: Rear PTO solenoid - open circuit or Rear PTO solenoid circuit overcurrent

The controller has detected an electrical fault—specifically an open circuit, a short to ground, or an overcurrent condition—in the circuit that powers the rear Power Take-Off (PTO) engagement solenoid.

• Puma/Mid Range Magnum
• Farmall
• Puma Series
• Magnum Series
• Maxxum Series
• Steiger Series
• Farmall Compact Tractors

1. 1

   Inspect Connectors: Locate the Rear PTO Solenoid (often designated as connector X278 or X279) and the Transmission Module connectors. Check for pushed-out pins, corrosion, or moisture.

2. 2

   Test for Open Circuit: Disconnect the Electronic Management Unit/Transmission Module connector and the Rear PTO solenoid connector. Check for continuity on the power and return wires between the two connectors to isolate a broken wire in the harness.

3. 3

   Test for Short to Ground: With both ends disconnected, test the harness wires for continuity to the tractor chassis/ground.

4. 4

   Test the Solenoid Coil: Measure the resistance across the two pins of the Rear PTO solenoid itself. If the multimeter reads 'OL' (open loop) or an out-of-spec resistance, the internal coil of the solenoid has failed.

5. 5

   Check Fuses: Verify that the PTO circuit fuses in the main fuse box are intact.

1. 1

   Power Down

   Turn off the tractor, remove the key, and engage the parking brake.

2. 2

   Locate the Solenoid

   The Rear PTO solenoid is typically located on the rear left-hand top of the transmission housing or on the rear PTO valve block.

3. 3

   Harness Repair

   If the diagnostic tests revealed an open or shorted wire, trace the harness and repair the damaged section. Re-pin the connector if the fault is at the plug.

4. 4

   Solenoid Replacement

   Thoroughly clean the area around the PTO valve block to prevent dirt from entering the hydraulic system. Disconnect the 2-pin electrical connector from the solenoid. Unthread the retaining nut or mounting bolts securing the solenoid coil/cartridge valve. Remove the faulty solenoid. Lubricate the O-rings on the new solenoid valve with clean hydraulic oil and install it into the valve block. Tighten to OEM torque specs.

5. 5

   Reassembly & Calibration

   Reconnect the electrical harness. Clear the stored 5008 fault code from the transmission module. Depending on the model, you may need to perform a PTO calibration routine via the tractor's H-Menu or diagnostic tool before operating.