Case IH 2550 – Universal Control Module (UCM) or Central Control Unit (CCU): Stuck dump solenoid or clutch A solenoid.

Mismatch between the clutch A pressure command and the actual pressure sensor reading when clutch A is commanded to engage.

• Optum
• Case IH Puma Series (Puma 160, Puma 210)
• Case IH Magnum Series (Magnum 210, 220, 255, 285)
• Case IH Maxxum Series

1. 1

   Clear the error code from the UCM/CCU and test the system for normal operation to ensure it is not a transient glitch.

2. 2

   If no other error codes are displayed, perform a manual pressure test on the hydraulic system (specifically the clutch A circuit) to diagnose the root cause of the pressure mismatch.

3. 3

   Verify that no external power supply is connected that could be interfering with the module, and check the tractor's charging system for faults.

4. 4

   Inspect the wire harness for open circuits, short circuits to ground, or short circuits to 12V leading to the dump solenoid and clutch A solenoid.

1. 1

   Inspect Wiring and Connectors

   Locate the transmission external controls. Inspect the wiring harness and connectors for the dump solenoid and clutch A solenoid for corrosion, damage, or loose pins. Repair or replace the harness if faults are found.

2. 2

   Test the Solenoids

   Test the dump solenoid and clutch A solenoid for proper resistance and operation.

3. 3

   Replace Faulty Solenoid

   If the dump solenoid is stuck open/closed or the clutch A solenoid fails testing, replace the faulty solenoid valve. Coat the new valve components with clean transmission oil (e.g., Case IH Akcela Nexplore fluid) prior to assembly.

4. 4

   Module Replacement (Last Resort)

   If the solenoids, charging system, and wiring harness are all verified to be in good working order, the failure mode is likely a faulty Universal Control Module (UCM) or Central Control Unit (CCU). Replace and program the module.