E10
Cadillac Self-Test / Contactor Self-Check Failure

Charger display shows E10; unit will not start charging and may show ‘Relay Test Failed’ in diagnostics (if accessible).

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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

Defective contactor feedback contacts, Stuck or sluggish contactor mechanism, Faulty self-test routine in firmware, Loose wiring between contactor and control board feedback terminals

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before any inspection. Do not open the charger unless you are qualified.

User-level steps:

  • Power cycle: Turn the breaker OFF for 5 minutes, then ON. Many self-test faults clear if they were caused by a transient condition.
  • Listen during startup: When power is restored, listen for the internal self-test clicks. Repeated rapid clicking or no sound at all can indicate a mechanical contactor issue.

When to call a technician: If E10 persists, the contactor or its feedback circuit must be tested under safe conditions. A technician may need to replace the contactor or control board.

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Repair Difficulty

Professional Required 5/5

Required Part

Cadillac EVSE Main Contactor with Feedback Contacts
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