Cadillac Short Circuit or Overcurrent on EVSE Circuit

Charger trips the house breaker immediately or within a few seconds of starting a charge.

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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

Shorted internal component (contactor, MOV, filter capacitor), Pinched or shorted feeder cable, Incorrect breaker size or type, Ground fault not properly cleared by EVSE GFCI

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a breaker that trips immediately. This indicates a potentially dangerous fault.

Steps to try:

  • Unplug vehicle: With the breaker OFF, unplug the J1772 connector from the vehicle. Turn the breaker ON with no vehicle connected. If it still trips, the fault is in the charger or wiring.
  • Inspect external wiring: Look for visible damage to conduit, junction boxes, or the charger housing.

When to call a technician: A licensed electrician should test the circuit for shorts and verify breaker sizing. An EVSE technician may need to replace internal surge protection, filters, or the power board if they are shorted.

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Repair Difficulty

Professional Required 5/5

Required Part

Cadillac EVSE Power Board / Surge Protection Network
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