John Deere 5016.06 – CCU (Chassis Control Unit): 12 Volt Supply High AMPS

The system has detected an overcurrent (excessive amperage draw) on the 12-volt power supply circuit. This is typically caused by a short circuit to ground, a damaged wiring harness, or a failing component on that specific circuit drawing more current than the system allows.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 7200R
• 8320R

1. 1

   Check for secondary codes that might pinpoint a specific sensor, solenoid, or actuator that is shorting out the 12V supply

2. 2

   Inspect the wiring harness connected to the Rear Chassis Module for chafing, bare wires, or pinch points that could cause a short to the tractor's chassis ground

3. 3

   Inspect the CCU electrical connectors (such as the Rear Cab Interconnect and Rear Chassis Interconnect) for corrosion, moisture ingress, or damaged pins

4. 4

   Use a multimeter to test the 12-volt supply circuit for continuity to ground to isolate the source of the high amperage draw before condemning the module itself

1. 1

   Record Data

   Before removing the old unit, record the engine hours from the current CCU (this will be needed for the new unit).

2. 2

   Disconnect Power

   Disconnect the battery ground (—) cable.

3. 3

   Disconnect Module

   Disconnect the electrical connectors from the control unit.

4. 4

   Removal

   Remove the control unit mounting screws and extract the faulty CCU.

5. 5

   Installation

   Install the new CCU in the reverse order of removal.

6. 6

   Calibration

   Reconnect the battery ground. You must calibrate the new control unit using John Deere service software and enter the recorded engine hours.