New Holland 1028 – Hitch Controller / Electronic Draft Control (EDC) or Alta Implement (ATC): Travel Range potentiometer value received from CAN data bus indicates failure condition

The system is detecting an abnormally high voltage signal from the travel range (lift arm position) potentiometer, which usually points to a damaged potentiometer, an open circuit, or a short to a positive voltage (+12V).

• New Holland T5
• New Holland T6
• New Holland T7
• New Holland T8.xxx Series
• New Holland T9 Series
• New Holland TL80A
• New Holland TL90A
• New Holland TL100A
• New Holland TM Series
• New Holland TG210
• New Holland TG230
• New Holland TG255
• New Holland TG285

1. 1

   Check for companion code ARM 169, which indicates a configuration error if a potentiometer was connected to armrest connector J205 during calibration

2. 2

   Inspect the wiring harness and connectors (specifically armrest connector J205) for open circuits, chafed wires, or a short to +12V

3. 3

   Perform a resistance/voltage sweep test on the travel range potentiometer using a digital multimeter to check for dead spots or out-of-range values

4. 4

   Verify the CAN data bus communication lines between the Armrest Controller and the Hitch Controller are intact

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery before servicing electrical components to prevent further shorts.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a short to +12V or an open circuit in the harness between the potentiometer and the armrest controller, repair or replace the damaged section of the wiring harness.

3. 3

   Replace the Potentiometer

   If the wiring is intact but the potentiometer failed the sweep test (or is physically damaged), remove the faulty travel range potentiometer from the lift arm/armrest assembly and install the new OEM replacement.

4. 4

   Hydraulic Lift Autocalibration

   After replacing the part or fixing the wiring, you must perform a Hydraulic Lift Autocalibration (often associated with code 1024) to teach the controller the new minimum and maximum travel limits of the lift arm.

5. 5

   Clear Codes

   Use the New Holland Electronic Service Tool (EST) or a compatible DTC eraser to clear the stored 1028 fault code from the module's EEPROM.