John Deere 524105.03 – ACU: SCV II Control Lever Sensor Circuit Voltage High

This fault indicates that the voltage signal coming from the potentiometer/sensor inside the Selective Control Valve (SCV) #2 control lever is higher than the expected normal operating range. This condition is typically caused by a failed potentiometer inside the lever, a short to power in the wiring harness, or an open ground circuit.

• 7720
• 7820
• 7920
• 8130
• 8230
• 8330
• 8430
• 8530
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8345R
• 8400R
• 9430
• 9530
• 9630

1. 1

   Set the SCV II lever to the neutral position and cycle the tractor's power (shut off the engine and restart) to see if the communication message resets and the code clears.

2. 2

   Perform a component isolation (swap test) by swapping the electrical connection of the SCV II lever with an adjacent lever (such as SCV I or SCV III). If the fault code changes to the corresponding code for the new SCV slot (e.g., 523923.03 for SCV I or 524104.03 for SCV III), the lever's internal potentiometer is faulty. If the fault code stays as 524105.03 on SCV II, the issue lies in the CAN-bus harness or the ACU.

3. 3

   Inspect the wiring harness between the SCV II lever and the ACU for pinched wires, shorts to a power source, or disconnected ground pins.

1. 1

   Prepare tractor for service

   Park the tractor on a level surface, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Access the SCV control levers

   Remove the retaining screws and carefully lift the CommandARM/armrest control console cover to access the SCV control levers.

3. 3

   Disconnect the faulty SCV II lever

   Locate the SCV II control lever assembly and disconnect its electrical wiring harness connector.

4. 4

   Remove the faulty SCV II lever

   Remove the mounting hardware securing the SCV II lever to the armrest bracket.

5. 5

   Install the replacement lever

   Install the new OEM SCV control lever and secure it with the mounting hardware.

6. 6

   Reconnect the electrical connector

   Reconnect the electrical connector to the new lever.

7. 7

   Reinstall the console cover

   Reinstall the armrest console cover.

8. 8

   Reconnect battery and start tractor

   Reconnect the battery and start the tractor.

9. 9

   Verify and calibrate

   Verify that the 524105.03 code has cleared. Note: Depending on the tractor model, you may need to navigate through the CommandCenter display to calibrate the new SCV lever's range of motion.