Case IH 2524 – Universal Control Module (UCM) or Transmission Controller / ECM: R1 solenoid - circuit fault

The system has detected an electrical issue (such as an open circuit, short circuit to ground, or short circuit to power) in the circuit controlling the R1 (Reverse 1 / High Range) synchronizer solenoid.

• Optum
• Case IH Puma 125
• Case IH Puma 140
• Case IH Puma 165
• Case IH Puma 170
• Case IH Puma 180
• Case IH Puma 185
• Case IH Puma 195
• Case IH Puma 200
• Case IH Puma 210
• Case IH Puma 215
• Case IH Puma 225
• Case IH Puma 230
• Case IH Magnum MX210
• Case IH Magnum MX230
• Case IH Magnum MX255
• Case IH Magnum MX285
• Case IH Magnum 210
• Case IH Magnum 220
• Case IH Magnum 225
• Case IH Maxxum MXU125
• Case IH Maxxum 110
• Case IH Maxxum 115
• Case IH Maxxum 120
• Case IH Maxxum 125
• Case IH Maxxum 130
• Case IH Maxxum 135
• Case IH Maxxum 140
• Case IH Maxxum 145

1. 1

   Check the wiring harness for a short circuit between the ECM connector pins or across the two coil terminals, and ensure the wiring harness is not damaged or pinched.

2. 2

   Inspect the R1 synchronizer solenoid electrical connector for corrosion, pushed pins, or loose connections.

3. 3

   Verify that the charging system is functioning correctly and that no external power supply is causing voltage irregularities.

4. 4

   Measure the resistance of the R1 solenoid to determine if the coil itself has failed.

5. 5

   Evaluate the Universal Control Module (UCM) or ECM if the wiring, connectors, and solenoid test fine.

1. 1

   Locate the R1 synchronizer solenoid

   Often located on the transmission valve block or bell housing, depending on the specific model.

2. 2

   Disconnect the R1 solenoid electrical connector

   Carefully disconnect the connector.

3. 3

   Measure the resistance

   Using a multimeter, measure the resistance between solenoid terminal 1 and terminal 2.

4. 4

   Verify the reading

   If the resistance indicated is not between 8 - 11 Ohms, the high range clutch / R1 solenoid is faulty.

5. 5

   Extract the faulty R1 solenoid

   If the solenoid fails the resistance test, remove the retaining hardware and extract the faulty R1 solenoid.

6. 6

   Install the replacement solenoid

   Install the replacement solenoid and reconnect the electrical harness.

7. 7

   Clear the error code

   Once the repair is complete, use a diagnostic tool or the tractor's onboard display to clear the error code.

8. 8

   Test the system

   Test the system for normal operation (a transmission calibration may be required after replacing transmission solenoids).