E13
Honda Internal Communication Error (Main PCB to Sensor Bus)

Robot mower displays E13 and stops randomly during operation without obvious obstacles.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Loose internal wiring harness, Oxidized multi‑pin connectors, Failing main control PCB, Shorted sensor module on CAN/I2C bus

How to Fix / Troubleshooting

Safety first: Turn OFF the mower, remove the key, and disconnect the battery before accessing internal electronics.

  • Inspect internal harnesses: Open the main housing and visually inspect all multi‑pin connectors between the main PCB, sensor modules, and drive units. Reseat each connector firmly.
  • Check for corrosion: Look for green/white corrosion on connector pins. Clean lightly with contact cleaner and a soft brush if needed.
  • Look for pinched cables: Ensure no harness is trapped between plastic covers or near moving parts.
  • Battery reset: Leave the battery disconnected for 5 minutes, reconnect, and test the mower.

If E13 continues, a specific sensor module or the main PCB may be defective. Component‑level diagnosis typically requires Honda diagnostic equipment.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB
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