New Holland ARMRE 18015 – Armrest Module (ARU - Arm Rest Unit / ATC - Armrest Tractor Controller): Rear hitch position control potentiometer - voltage too high

The control module is receiving a signal voltage from the rear hitch position control potentiometer that exceeds the maximum allowable threshold. This condition is typically caused by a short to power (5V or 12V) on the signal circuit, an open ground circuit on the potentiometer, or an internal failure of the potentiometer itself.

• New Holland T7 Series
• New Holland T8 Series (e.g., T8.275 - T8.440)
• New Holland TG Series (e.g., TG210, TG285)
• New Holland TM Series (e.g., TM190)
• New Holland T6000 Series (T6010 through T6070)

1. 1

   Visually inspect the wiring harness leading to the rear hitch position control potentiometer for chafed wires, pinched harnesses, or disconnected plugs

2. 2

   Disconnect the potentiometer and check the pins for corrosion, moisture, or pushed-out terminals

3. 3

   Test the ground wire at the potentiometer connector for an open circuit (an open ground will cause the signal voltage to pull high, triggering the code)

4. 4

   Check the signal wire for a short to the 5V reference or 12V power supply

5. 5

   If the wiring harness tests good (intact ground, no shorts to power), test the potentiometer for internal failure

1. 1

   Power down the tractor and disconnect the battery ground if working near sensitive armrest electronics.

2. 2

   Disassemble the armrest control console (EHR panel) to access the underside of the hitch control levers/dials.

3. 3

   Locate the rear hitch position control potentiometer and unplug its electrical connector.

4. 4

   Remove the retaining hardware securing the potentiometer to the hitch control lever assembly.

5. 5

   Install the replacement potentiometer and secure it in place.

6. 6

   Reconnect the electrical harness and reassemble the armrest console.

7. 7

   Power on the tractor and clear the stored fault codes.

8. 8

   Enter the tractor's H1 Calibration Menu (or use the electronic service tool) to perform the Electronic Hydraulic Remote / Rear Hitch calibration procedure, ensuring the new potentiometer's sweep is learned by the Armrest controller.