John Deere 569.05 – CCU: Rear Differential Lock Solenoid Circuit Fault

The Chassis Control Unit (CCU) identifies a malfunction within the rear differential lock solenoid driver or its electrical circuit. The system has detected an open circuit, a short circuit, or an over-temperature condition, which impairs the electrical and mechanical operations of the solenoid.

• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5090M
• 5115M
• 5050E
• 5058E
• 5067E
• 5075E
• 7720
• 7820
• 7920
• 7630
• 7730
• 7830
• 7930
• 7810

1. 1

   Cycle the differential lock switch on and off to see if a momentary glitch clears the code

2. 2

   Restart the tractor engine to verify if the active Service Code reappears and to reset communication messages

3. 3

   Inspect the wiring harness routing to the rear differential lock solenoid for visual signs of damage, chafing, or accumulated debris

4. 4

   With the CCU in diagnostic mode, perform a Circuit Test (BEEP Mode) by momentarily jumping the solenoid connector terminal wires to check circuit continuity

5. 5

   Remove the differential lock solenoid and perform a Resistance Test using an ohmmeter to determine if the internal coil is open or shorted

1. 1

   Relieve hydraulic pressure

   Relieve all hydraulic pressure before disconnecting any hydraulic lines or removing valves, as escaping fluid under pressure can cause serious injury.

2. 2

   Locate the solenoid

   Locate the rear differential lock solenoid on the rear axle/differential housing valve block.

3. 3

   Disconnect electrical connector

   Unplug the wiring harness connector from the solenoid.

4. 4

   Remove the solenoid

   Unthread or unbolt the faulty differential lock solenoid from the valve body.

5. 5

   Install new part

   Lubricate the O-rings on the new solenoid with clean hydraulic fluid and install it into the valve block. Tighten to the specified torque for your exact model.

6. 6

   Reconnect and test

   Reconnect the electrical harness. Start the tractor, cycle the differential lock switch, and verify that the CCU 000569.05 code is cleared and the differential lock engages normally.