E12
Hyundai
User Authentication / RFID Reader Fault
E12 is displayed and the charger cannot authenticate or start a session when using RFID or app control.
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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
Faulty RFID reader module in Hyundai wallbox, Damaged communication cable between RFID reader and control board, Corrupted user authorization data in memory, Firmware bug in access control module
How to Fix / Troubleshooting
Safety first: Turn off power before removing any front panels that expose electronics.
- Test multiple cards: Try more than one authorized RFID card or tag to rule out a bad card.
- Check app connectivity: If the charger supports app control, attempt to start a session via the app. If app works but RFID does not, the reader is suspect.
- Inspect RFID module: With power OFF, ensure the RFID reader’s connector is firmly seated on the main control board.
- Re‑register cards: Using the Hyundai charger’s setup procedure, attempt to clear and re‑add RFID cards.
- If E12 persists: Replace the RFID reader module or main control board as specified by Hyundai service documentation.
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Repair Difficulty
Medium
3/5
Required Part
RFID Reader Module
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