Case IH 56050 – Transmission Controller (TRANS): 5F Valve Coil circuit is open or shorted to ground when valve is OFF.

The transmission controller measures the voltage and current draw on the 5F clutch solenoid circuit. When the 5F clutch solenoid is commanded OFF, the controller detects that the voltage/current draw is lower than expected. This means the circuit is either open, shorted to ground, or has lost its power supply from the neutral latch relay.

• STX Steiger
• Steiger 280
• Steiger 330
• Steiger 335
• Steiger 350
• Steiger 370
• Steiger 380
• Steiger 385
• Steiger 400
• Steiger 420
• Steiger 430
• Steiger 435
• Steiger 450
• Steiger 470
• Steiger 480
• Steiger 485
• Steiger 500
• Steiger 530
• Steiger 535
• Steiger 540
• Steiger 550
• Steiger 580
• Steiger 600
• Steiger 620
• STX280
• STX325
• STX330
• STX375
• STX380
• STX430
• STX480
• STX500
• STX530
• Quadtrac 370
• Quadtrac 420
• Quadtrac 450
• Quadtrac 470
• Quadtrac 500
• Quadtrac 540
• Quadtrac 550
• Quadtrac 580
• Quadtrac 600
• Quadtrac 620
• MX Magnum Series
• TJ Series (TJ275 - TJ500)

1. 1

   Check if the problem is temperature-sensitive (occurs only at operating temperature), which indicates an internally failing solenoid coil

2. 2

   Perform a coil resistance test on the 5F clutch solenoid (expected values range from 9.4 ohms at 40°F to 14.3 ohms at 140°F)

3. 3

   Inspect the wiring harness between the 5F clutch solenoid and the transmission controller for open circuits or shorts to ground

4. 4

   Verify that power is available from the neutral latch relay, as an open circuit in the solenoid power wire will trigger this code

1. 1

   Disconnect the Solenoid

   Locate the 5F clutch solenoid on the transmission regulator valve assembly and disconnect its electrical connector.

2. 2

   Test the Coil

   Measure the resistance of the solenoid coil. If the resistance is lower than the specified range (indicating a short) or shows no continuity (indicating an open circuit), replace the 5F solenoid coil.

3. 3

   Test the Wiring

   If the coil resistance is within specification, leave the connector unplugged and turn the key switch ON. Check for voltage at the connector to ensure power is being supplied. Inspect the harness running to the transmission controller for chafing, pinched wires, or damaged pins. Repair or replace the wiring harness as necessary.

4. 4

   Replace the Controller (Last Resort)

   If the solenoid coil tests good and the wiring harness has no faults, the transmission controller itself has likely failed and must be replaced.

5. 5

   Recalibrate

   After replacing the solenoid, repairing the wiring, or replacing the controller, clear the fault codes and perform a transmission controller calibration.