John Deere 1080 – HCU: Height Sensor Power 2 Voltage Too High

The 'Height Sensor Power 2' circuit voltage has exceeded the acceptable range of 5.25VDC. This circuit supplies power to the CONTOUR MASTER Angle Sensor and the Header Raise Pressure Sensor. The condition is typically caused by a short circuit to a voltage source in the wiring harness or a malfunctioning internal voltage regulator within the Header Control Unit (HCU).

• 9540 WTS
• 9560 WTS
• 9580 WTS
• 9640 WTS
• 9660 WTS
• 9680 WTS
• 9560 STS
• 9660 STS
• 9760 STS
• 9650 STS
• 9750 STS
• 9770 STS
• 9540i WTS
• 9560i WTS
• 9580i WTS
• 9640i WTS
• 9660i WTS
• 9680i WTS
• 9780i CTS

1. 1

   Confirm the presence of fault code E01 1080 03 using the onboard diagnostic display

2. 2

   Visually inspect the wiring harness connected to the HCU, CONTOUR MASTER Angle Sensor, and Header Raise Pressure Sensor for chafing, pinched wires, or corrosion

3. 3

   Disconnect the CONTOUR MASTER Angle Sensor and Header Raise Pressure Sensor to see if the fault code clears, isolating the issue to the sensors or their immediate wiring

4. 4

   With sensors disconnected, check for a short to voltage in the wiring harness leading back to the HCU

5. 5

   Measure the voltage output on the 'Height Sensor Power 2' circuit directly at the HCU connector (e.g., X205) to verify if it exceeds 5.25VDC

1. 1

   Repair Wiring

   If a short circuit to a voltage source is found in the wiring harness, repair or replace the damaged section of the harness.

2. 2

   Replace Sensor

   If the fault was isolated to the sensors during diagnostic checks, replace the faulty CONTOUR MASTER Angle Sensor or Header Raise Pressure Sensor.

3. 3

   Replace Header Control Unit

   If diagnostic checks point to a faulty internal voltage regulator, replace the Header Control Unit. A software update for the control unit might also be necessary.

4. 4

   Calibrate system

   After replacing any components related to the header control system, such as sensors or the HCU itself, perform a calibration of the CONTOUR MASTER system.