Case IH 2041 – Transmission Control Module (TCU) / DR Module / DS Module: Open circuit in the transmission solenoid system

The transmission controller is sending a signal to the Pulse-Width Modulation (PWM) valve, but it detects no current flow. This means the electrical circuit is broken, which could be caused by a severed wire, a disconnected plug, or a burned-out solenoid coil.

• Maxxum
• Puma Series (115, 125, 140, 150, 165, 180, 195, 210, 225, 240)
• Maxxum Series (100, 110, 115, 120, 125, 130, 140)
• Steiger Series
• T6000 / SWB Puma equivalents

1. 1

   Perform an open-circuit voltage test on the battery to ensure no surface charge issues or low voltage drops are causing module faults.

2. 2

   Inspect the wiring harness leading to the transmission control valve block for rubbed-through wires, rodent damage, or disconnected plugs at the Low Range / C4 PWM valve.

3. 3

   Disconnect the harness at the PWM valve and check for pushed-back pins, corrosion, or moisture inside the connector.

4. 4

   Use a multimeter to measure the resistance across the pins of the PWM solenoid valve. An 'OL' (Open Loop) or infinite resistance reading confirms the internal coil is broken.

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent short circuits during repair.

2. 2

   Locate the Valve

   Locate the transmission control valve block (usually mounted on the side of the transmission housing) and identify the specific Low Range / C4 PWM solenoid.

3. 3

   Replace or Repair

   If the solenoid coil failed the resistance test, unbolt and replace the PWM solenoid valve. If the valve tested good, trace the wiring back to the DR/DS Transmission Module and repair the broken wire in the harness.

4. 4

   Clear Codes

   Reconnect the battery and clear the fault codes. The fault condition must be corrected before the tractor will allow you to proceed to calibration.

5. 5

   Transmission Calibration

   Enter the H3 Menu / DR Module configuration screen. You must recalibrate the transmission clutches. The module needs to determine the new current required to turn the input/output shafts at the required speed and adjust the 'quickfill' settings for the new valve.