Case IH U120 – Universal Controller (HK), Electronic Hydraulic Remote (EHR) valve controller, or Full Power Shift (FPS) / CVT Transmission ECU: Inclinometer self-test failed.

The inclinometer is broken. The inclinometer (or inclination sensor) is a dual-axis electronic sensor that measures the lateral (side-to-side) and longitudinal (fore-aft) chassis angle of the machine. When the sensor fails its internal self-check, it can no longer provide accurate angular position metrics to the control modules, disabling automated frame adjustments, suspension leveling, or transmission safety interlocks.

• Puma 125
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225 CVX
• Magnum MX210
• Magnum MX230
• Magnum MX255
• Magnum MX285
• Steiger series
• Farmall 40
• Farmall 45
• Farmall 50
• Farmall 115U
• Axial-Flow 5150
• Axial-Flow 6150
• Axial-Flow 7120
• Axial-Flow 7230
• Axial-Flow 8240
• Axial-Flow 9250
• Axial-Flow AFX8010
• LB324R
• LB434P

1. 1

   Verify the machine is parked on completely flat, smooth ground to ensure accurate resting angle.

2. 2

   Remove any rear attachments or heavy implements that might be altering the chassis resting angle.

3. 3

   Verify that the correct set of wheels/tires is installed and that tire pressures are even, as mismatched wheels will physically tilt the machine.

4. 4

   Check the physical mounting of the inclinometer to ensure it is securely bolted to the chassis/mainframe and has not vibrated loose.

5. 5

   Inspect the 3-wire polyurethane conductor cable and 5-Volt reference circuit for open circuits, shorts, or corrosion at the connector.

6. 6

   Use the Case IH diagnostic tool to enter the 'H' or 'HH' menu to read the live potentiometer/inclinometer voltage to see if it is completely dead or just out of range.

1. 1

   Locate the Sensor

   The inclinometer is typically mounted directly to the central mainframe chassis, the front suspended axle, or (on combines) the self-leveling sieve/cleaning shoe assembly.

2. 2

   Removal

   Turn off the machine and disconnect the battery. Unplug the 3-pin electrical connector from the sensor. Remove the mounting bolts securing the sensor to the bracket.

3. 3

   Installation

   Mount the new inclinometer in the exact same orientation as the old one. Torque the mounting hardware to OEM specifications to prevent vibration. Reconnect the electrical harness.

4. 4

   Calibration

   A new inclinometer must be calibrated. Park the tractor/combine on perfectly level ground. Access the machine's calibration menu (via the diagnostic tool or in-cab monitor) and initiate the 'Inclinometer Calibration Procedure' to set the new zero-degree baseline.

5. 5

   Clear Codes

   Clear the U120 fault code and restart the machine to ensure the self-test passes.