Generator controller shows E15 and logs 'CAN Communication Error' or 'Controller Communication Fault'.

Safety first: Turn OFF the generator and disconnect battery power before unplugging or plugging any control modules.

• Inspect CAN wiring: Locate the twisted pair CAN bus wires between the Kubota main controller and any remote modules. Check for cuts, abrasions, or crushed sections.
• Check terminations: Ensure that the CAN bus has proper termination resistors at each end as specified by Kubota. Missing or extra terminators can cause communication errors.
• Secure connectors: Reseat all multi-pin connectors on the controller and modules. Look for bent pins or corrosion and clean as needed.
• Grounding: Verify that the controller ground and chassis ground connections are tight and free of paint or rust. Poor grounding can introduce noise on the communication bus.
• Module isolation: If multiple modules are on the bus, disconnect them one at a time to identify a faulty device that causes E15 when connected.