Case IH P08 – Electronic Management Unit (EMU) / Armrest controller: Rear PTO Solenoid Stuck Off

The controller has detected that the electrical circuit for the rear Power Take-Off (PTO) engagement solenoid is either drawing too much current (shorted to ground) or has a broken connection (open circuit), preventing the PTO from engaging.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum 100
• Maxxum 110
• Maxxum 115
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 135
• Maxxum 140
• Maxxum 145
• Maxxum 150
• Puma 115 through 260
• Magnum 180 through 340
• CVX 140
• CVX 150
• CVX 160
• CVX 175
• CVX 195
• C50-C100
• CX50-CX100

1. 1

   Locate the rear PTO solenoid on the transmission valve block (typically located on the rear left-hand top of the transmission).

2. 2

   Disconnect the PTO solenoid electrical connector (designated as C041, X279, or X287) and inspect the 2-pin connector for moisture, corrosion, or pushed-out pins.

3. 3

   Check the wiring harness between the Electronic Management Unit (EMU) and the solenoid connector for continuity. Test for a short to ground or a short to +12V.

4. 4

   Measure the resistance across the two pins of the solenoid coil. An open reading (infinite resistance) or a dead short indicates internal failure of the coil.

1. 1

   Ensure the tractor is turned off, the key is removed, and hydraulic pressure is relieved.

2. 2

   Locate the rear PTO solenoid on the transmission valve stack.

3. 3

   Disconnect the 2-pin electrical connector from the solenoid.

4. 4

   Remove the retaining nut or bolt that secures the solenoid coil to the valve stem.

5. 5

   Slide the faulty solenoid coil off the valve cartridge.

   Or remove the entire cartridge valve if replacing the whole assembly.

6. 6

   Install the new PTO solenoid/valve and tighten the retaining nut to the manufacturer's specification.

7. 7

   Reconnect the electrical connector.

   If the connector housing is damaged, splice in a new pigtail connector.

8. 8

   Power on the tractor, clear the P08 fault code via the H-Menu or diagnostic tool, and test the rear PTO engagement to verify the repair.