E06
Hyundai
Internal Communication Failure (Main Control Board to Power Board)
Display shows E06 and charging cannot be initiated; sometimes occurs after a power outage.
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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 low‑voltage harness between control board and power board, Corroded board‑to‑board connector, Firmware mismatch after update, Failed main control board microcontroller
How to Fix / Troubleshooting
Safety first: Turn off the charger at the breaker before opening any covers.
- Inspect low‑voltage connectors: Remove the front cover and locate the ribbon cable or multi‑pin harness between the main control board and the power board. Reseat both ends firmly.
- Check for corrosion or moisture: Look for green/white deposits on connectors. If present, lightly clean with contact cleaner and allow to dry completely.
- Power cycle: Restore power and wait for the charger to fully boot (up to 60 seconds). See if E06 clears.
- Firmware check: If your Hyundai charger supports app‑based firmware updates, verify that the update completed successfully. Do not interrupt updates mid‑process.
- If E06 persists: The main control board or power board may be defective. Professional diagnosis with Hyundai service tools is recommended; replace the faulty board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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