John Deere E01 – HCU: Header Control Unit Diagnostic Alert

Fault code E01 is a general diagnostic alert logged by the Header Control Unit (HCU) when it detects a fault within its system. It indicates an issue with the control unit responsible for managing header functions, representing a category of failures rather than a single specific failure mode. Underlying conditions can range from electrical issues, such as out-of-range voltages and open or short circuits, to software and calibration problems. The specific nature of the fault must be identified by an accompanying SPN and FMI code.

• 9450
• 9550
• 9560
• 9650
• 9660
• 9750
• 9760
• 9860 STS
• 9540 WTS
• 9560 WTS
• 9580 WTS
• 9640 WTS
• 9660 WTS
• 9680 WTS
• 9560 STS
• 9650 STS
• 9660 STS
• 9750 STS
• 9760 STS

1. 1

   Access the specific SPN and FMI code stored in the Header Control Unit via the corner post display

2. 2

   Check the controller supply voltage (should be below 16 VDC)

3. 3

   Verify the voltage for Height Sensor Power (circuit 481), which should be between 4.75 and 5.25 VDC

4. 4

   Check the voltage for Height Sensor Power 2 (circuit 471), which should be between 4.75 and 5.25 VDC

5. 5

   Test individual header height sensors (left, right, center) for a voltage between 0.5 and 4.5 VDC

6. 6

   Inspect the wiring harness for damage, rubbing, or breaks, especially above the feeder house, and check the single-point connector

7. 7

   Test sensor functionality, such as the header position potentiometer (should show a voltage change from 0.5V to 4.5V as the header moves)

8. 8

   Check the calibration status for the Active Header Height Control, CONTOUR MASTER™, or Header Float systems

1. 1

   Identify specific DTC

   Access the diagnostic trouble codes through the corner post display to get the specific SPN and FMI numbers associated with the E01 fault.

2. 2

   Address boot block faults (E01 628 12)

   If code E01 628 12 is present, disconnect the connectors for the Header Control Unit, wait 30 seconds, and reconnect. If the problem persists, reprogram the controller with the latest software. Replace the control unit if unresolved.

3. 3

   Address voltage-related faults

   For codes like E01 1079 03/04, E01 1080 03/04, or E01 1535 03/04, inspect wiring for shorts or open circuits. If wiring is intact, replace the faulty sensor or the Header Control Unit if its internal voltage regulator has failed.

4. 4

   Address valve driver faults

   For header raise/lower or tilt left/right faults, check the wiring and connections to the specific valve solenoid. If wiring is good, replace the faulty solenoid coil.

5. 5

   Address calibration faults

   For codes E01 1515 13 or E01 1516 13, perform the appropriate calibration procedure for the attached header as outlined in the operator's manual.

6. 6

   Component Replacement

   If diagnostic checks point to a faulty component, replace it. This could be a sensor, a valve solenoid, or the Header Control Unit itself.