E18
Cadillac Display / HMI Communication Fault

Charger shows E18; display may be blank or frozen, with only a backlight or logo visible.

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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 LCD or LED display module, Loose ribbon cable between display and main board, Faulty HMI microcontroller, Moisture ingress at front panel

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before touching or pressing on the display area.

Steps to try:

  • Power cycle: Turn the breaker OFF for 5 minutes, then ON. Watch for any change in the display behavior.
  • Check for condensation: Look for fogging or moisture under the display lens. If present, allow the unit to dry in a warm, dry environment and avoid use until dry.
  • Use app (if available): If the display is unreadable but the charger still charges, use the app to monitor status while arranging service.

When to call a technician: A persistent E18 or dead display requires replacement of the display/HMI module or front panel assembly by a service technician.

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Repair Difficulty

Medium 3/5

Required Part

Cadillac EVSE Display / HMI Front Panel Module
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