Case IH 2384 – Transmission Control Module (TCM): Parklock - potentiometer signal too high

The voltage signal returning from the parklock potentiometer (which monitors the physical position of the shuttle/parklock lever) is exceeding the maximum expected threshold. This condition typically points to a short circuit to power (e.g., 5V or 12V), an open ground circuit on the sensor wiring, or an internal failure of the potentiometer itself.

• Puma/Mid Range Magnum
• Puma 115
• Puma 125
• Puma 140
• Puma 155
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225
• Puma 240
• Puma CVX

1. 1

   Inspect the wiring harness between the steering console/shuttle lever and the Transmission Control Module for chafed wires shorting to a power source.

2. 2

   Using a multimeter, check the parklock sensor switch signal wire, the reference voltage wire, and the ground wire. Verify that the ground circuit is intact (an open ground will cause the signal voltage to default high).

3. 3

   Disconnect the shuttle lever connector and check for corrosion, moisture, or pushed-out pins.

4. 4

   Test the resistance/voltage sweep of the potentiometer while moving the lever. If the reading is erratic, stuck high, or out of specification, the lever assembly has failed internally.

1. 1

   Secure the Machine

   Park the tractor on a flat surface, turn off the engine, and manually chock the wheels to prevent rolling.

2. 2

   Access the Console

   Remove the plastic trim and covers around the steering column/steering console to access the base of the power shuttle lever.

3. 3

   Disconnect Electronics

   Unplug the electrical harness connector leading to the shuttle lever/parklock potentiometer assembly.

4. 4

   Remove the Lever

   Remove the mounting screws (typically M4 screws and lock washers) securing the control lever assembly to the steering console.

5. 5

   Install the New Part

   Mount the replacement shuttle lever assembly and secure it with the mounting hardware.

6. 6

   Reconnect and Reassemble

   Plug the electrical connector back in and reinstall the steering column covers.

7. 7

   Clear Codes and Calibrate

   Turn the key on, clear the 2384 fault code from the instrument cluster/TCM, and perform a transmission/parklock calibration procedure to ensure the controller learns the new potentiometer's voltage limits. Test for normal operation.