Case IH 6024 (564.15) - DEC – CCM (Chassis Control Module) or Transmission Controller (TCM): 2WD Solenoid - short to high voltage

The FWD (Front Wheel Drive) / 2WD / MFD (Mechanical Front Drive) Solenoid circuit has a short circuit to battery (high voltage). The control module detects voltage on the solenoid's ground or control circuit when it should not be present, or the resistance is out of specification in a way that mimics a direct short to a 12V power source. This can cause erratic 4WD engagement or blow circuit fuses.

• VESTRUM CVX
• Magnum MX210
• Magnum MX230
• Magnum MX255
• Magnum MX285
• Magnum 180
• Magnum 190
• Magnum 210
• Magnum 260
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225 CVX
• Maxxum 115
• Maxxum 125
• Maxxum 135
• CX50
• CX60
• CX70
• CX80
• CX90
• CX100
• Farmall Series

1. 1

   Inspect the wiring harness leading to the MFD/2WD solenoid for rubbed-through wire insulation touching a 12V source

2. 2

   Disconnect the solenoid connector and inspect for bent pins, water ingress, or corrosion that could bridge the power and control pins

3. 3

   With the key ON and the solenoid disconnected, probe the harness side to check for 12V on the ground/return wire (indicates a short to power in the harness)

4. 4

   Measure the resistance across the solenoid coil pins (if extremely low or outside the 6–10 ohm range, the coil is internally shorted)

5. 5

   Ensure the alternator is not overcharging (outputting >14.7V), which can trigger false high-voltage codes

1. 1

   Preparation

   Park the tractor on a level surface, apply the park brake, and turn off the engine. Chock the wheels.

2. 2

   Relieve Pressure

   Ensure all hydraulic pressure is relieved from the circuits by cycling the steering and remotes with the key on/engine off.

3. 3

   Disconnect Power

   Disconnect the negative battery cable to prevent electrical spikes.

4. 4

   Locate the Solenoid

   Locate the 2WD/MFD solenoid valve. On Magnum and Puma models, it is typically found on the transmission valve stack or the transfer box drop-box.

5. 5

   Remove the Solenoid Coil

   Disconnect the electrical connector. Remove the retaining nut at the end of the solenoid stem. Slide the electromagnetic coil off the valve cartridge. (If only the coil is shorted, you do not need to drain the hydraulic oil or remove the cartridge).

6. 6

   Replace the Valve (If necessary)

   If the entire valve assembly is faulty, clean the surrounding area, unscrew the valve cartridge, and quickly install the new one to minimize fluid loss. Replace all O-rings.

7. 7

   Reassembly

   Slide the new coil onto the stem, tighten the retaining nut, and plug in the connector.

8. 8

   Clear Codes

   Reconnect the battery, turn the key ON, and use the tractor's instrumentation display or a diagnostic service tool to clear the 6024 fault code. Test drive to ensure 4WD engages and disengages properly.