John Deere 000925.04 – SCO: Low Voltage on Rear SCV 12

The Front Chassis Module (SCO) has detected a voltage level that is below the normal operating range on the electrical circuit for Rear SCV Valve 12. This low voltage state prevents the selective control valve from functioning correctly, leading to issues with hydraulic implement control.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7R Series
• 7020 Series
• 9030 Series

1. 1

   Record and clear the fault code, then operate the tractor and the specific SCV to see if the code reappears immediately

2. 2

   Visually inspect the battery terminals, alternator connections, and main ground connections for cleanliness, tightness, and signs of corrosion

3. 3

   Check fuses related to the SCO/Chassis controllers (fuses F12, F24, and F51 are commonly relevant for similar faults)

4. 4

   Inspect the wiring harness and connector leading from the SCO module to the rear SCV bank, specifically at the solenoid for Rear SCV Valve 12, looking for pinched, chafed, or frayed wires, corrosion, moisture, or pushed-out pins

5. 5

   Using a multimeter with the key on, check the voltage supply at the SCV solenoid connector for a stable reading, and check for continuity to ground on the power wire to rule out a short circuit

1. 1

   Ensure safety and relieve pressure

   Park the tractor on a level surface, shut down the engine, and engage the park lock. Relieve any residual hydraulic pressure by moving the SCV levers back and forth.

2. 2

   Identify the Component

   Locate the rear SCV bank. Identify the solenoid for 'Rear SCV Valve 12'. You may need to activate each SCV from the cab and have an assistant identify which solenoid actuates.

3. 3

   Perform Diagnostic Checks

   Complete the diagnostic checks listed in the section above, starting with visual inspections and fuse checks.

4. 4

   Address Wiring Issues

   If any damaged wiring or corroded connectors are found, repair or replace them. Ensure all connections are clean and secure.

5. 5

   Component Replacement

   If the wiring, fuses, and connections are confirmed to be in good condition, the issue likely lies with the SCV solenoid (coil) itself. Disconnect the electrical connector, unscrew and remove the solenoid from the hydraulic valve block, install the new solenoid tightened to manufacturer specifications, and reconnect.

6. 6

   Final Verification

   After the repair, start the tractor, clear the fault codes, and operate the SCV to confirm that the fault does not return and the hydraulic function is restored.