Case IH 1027 – Hitch Control Module: Not implemented / Lift arm position sensing control voltage low

Depending on the tractor model and generation, this code indicates either a software configuration mismatch where the controller receives a command for an unsupported feature ('Not implemented'), or a low voltage condition (short or open circuit) in the lift arm position sensing circuit.

• Magnum
• Magnum 235 - 340 (Series 4)
• Steiger
• Puma
• CX Series
• MX Series

1. 1

   For 'Not implemented' software mismatch: Check the tractor's configuration settings in the display/monitor to ensure it is not configured for a hitch option or draft pin sensor that isn't physically installed.

2. 2

   For 'Not implemented' software mismatch: Check for CAN bus communication errors between the Armrest controller and the Hitch controller, and verify software versions.

3. 3

   For 'Lift arm position sensing voltage low' condition: Inspect the lift arm position sensor (potentiometer) and its wiring harness for shorts to ground or open circuits.

4. 4

   For 'Lift arm position sensing voltage low' condition: Verify the 5-volt reference voltage to the sensor.

5. 5

   For 'Lift arm position sensing voltage low' condition: Check the physical linkage (sensor rod/lever) to the lift arm position sensor to ensure it hasn't disconnected or broken.

1. 1

   Read fault codes

   Connect the electronic service tool (EST) to the tractor's diagnostic port to read all active and stored fault codes in the Hitch and Armrest modules.

2. 2

   Verify hitch settings

   For 'Not implemented' (software mismatch): Navigate to the tractor configuration menu and verify that the hitch settings match the physical hardware (e.g., disable draft control or specific remote switches if they are not installed).

3. 3

   Re-flash controllers

   For 'Not implemented' (software mismatch): If the code persists, re-flash the Hitch Controller and Armrest Controller with the latest OEM software to resolve CAN bus command mismatches.

4. 4

   Inspect sensor and connector

   For 'Lift Arm Position Sensor (voltage low)': Locate the rear hitch lift arm position sensor (mounted on the rear rockshaft). Disconnect the sensor connector and inspect for corrosion, moisture, or bent pins.

5. 5

   Verify voltage

   For 'Lift Arm Position Sensor (voltage low)': Use a multimeter to verify the 5V reference and ground at the connector.

6. 6

   Check wiring continuity

   For 'Lift Arm Position Sensor (voltage low)': Measure the signal wire continuity back to the Hitch controller. Repair any open or shorted wires.

7. 7

   Replace sensor

   For 'Lift Arm Position Sensor (voltage low)': If the wiring is intact and voltage is correct, replace the lift arm position sensor.

8. 8

   Calibrate rear hitch

   For 'Lift Arm Position Sensor (voltage low)': Perform a rear hitch calibration procedure so the controller learns the new sensor's minimum and maximum travel limits.