E12
Cadillac User Authentication / RFID Reader Fault

Charger display shows E12; unit may not respond to RFID cards or app commands.

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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

Failed RFID reader module, Damaged front panel or reader antenna, Loose ribbon cable between reader and control board, Firmware configuration error disabling authentication

How to Fix / Troubleshooting

Safety first: Do not open the charger while powered. Turn OFF the breaker before any physical inspection.

Steps to try:

  • Clean front panel: Wipe the RFID reader area with a soft, dry cloth to remove dirt or moisture.
  • Test multiple cards: Try more than one authorized RFID card or fob to rule out a bad card.
  • Check app settings: In the Cadillac charging app (if used), verify that RFID authentication is enabled and that your cards are registered.
  • Power cycle: Turn the breaker OFF for 2 minutes, then ON, and test again.

When to call a technician: If E12 persists and no cards are recognized, the RFID reader or its cable may be defective. A technician can replace the reader module or front panel assembly.

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Repair Difficulty

Medium 3/5

Required Part

Cadillac EVSE RFID Reader Module / Front Panel Assembly
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