John Deere 003598.06 – OIC / ECU: 12 Volt Supply High AMPS

A control module has detected an abnormally high current draw (amperage) on a specific 12-volt power supply circuit. This overcurrent condition suggests a short circuit to ground or a failing component drawing excessive electrical power. Depending on the machine architecture, this fault is typically logged by the Operator Interface Control (OIC) unit (indicating an issue with Supply Voltage #2 or a Wakeup Output Circuit) or the Engine Control Unit (ECU) (indicating an Injector Spill Valve Hold Circuit is stuck on).

• 6MC
• 6RC
• 6100MC
• 6100RC
• 6110MC
• 6110RC
• 8R Series
• 8RW Series
• 8245R
• 8400R
• 9RT Series
• 9470RT
• 9520RT
• 9570RT
• Self-Propelled Forage Harvesters

1. 1

   Record the full code, cycle the ignition key off and on, and attempt to clear it to determine if the fault is active.

2. 2

   Visually inspect the wiring harnesses connected to the OIC or ECU for chafing, melting, pinched wires, or corrosion on connectors.

3. 3

   Check the wiring harness for areas rubbing against the machine's frame or other components that could cause a short circuit to ground.

4. 4

   Isolate the circuit by disconnecting the specific component on that circuit (e.g., Wakeup Output Circuit component or Injector Spill Valve). If the fault disappears, the issue is the component or its dedicated wiring.

1. 1

   Repair damaged wiring

   If chafed, melted, or broken wires are found, cut out the damaged section, splice in a new wire of the same gauge, and seal with heat-shrink tubing to prevent moisture intrusion.

2. 2

   Clean connectors

   If connectors show signs of corrosion, disconnect them and clean the pins and sockets using an appropriate electrical contact cleaner. Ensure the connector seals are intact before reconnecting.

3. 3

   Replace faulty component

   If circuit isolation diagnostics point to a specific component (such as the injector spill valve or a wakeup circuit component) drawing excessive current, replace the component.

4. 4

   Replace control module

   If the wiring harness and all external components are confirmed to be in good condition, the OIC or ECU may have a failed internal driver circuit. Replace the affected control module as a final step.