E020
Mammotion
CAN / Internal Bus Communication Fault
Mower shows E020; app indicates internal communication error between modules
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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 harness between mainboard and peripheral modules, Damaged communication cable, Faulty peripheral module pulling bus down, Mainboard communication controller failure
How to Fix / Troubleshooting
Safety: Power OFF and disconnect the battery before opening the mower.
- Connector reseat: Open the electronics compartment and reseat all multi-pin connectors between the mainboard and modules (e.g., display, RTK, motor controllers).
- Inspect harness: Look for pinched or abraded communication cables, especially where they pass through tight openings.
- Module isolation (advanced): If possible, disconnect non-essential modules one at a time and power up to see if E020 clears, helping identify a faulty module.
- If the error persists with all harnesses intact, the mainboard communication controller may be defective and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Wiring Harness
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