General Motors Input Short / Ground Fault in Charger

Breaker feeding the GM EV home charger trips as soon as or shortly after turning it ON, even with no vehicle connected.

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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 MOV surge suppressor on GM input board, Pinched conductor at strain relief, Water ingress causing tracking between line and ground, Shorted rectifier in power conversion module

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a breaker that trips immediately; this indicates a serious fault.

Steps:

  • Visual inspection: Without opening the unit, look for burn marks, melted plastic, or signs of water entry around the charger.
  • Check environment: If the charger is outdoors, look for recent heavy rain or sprinkler spray hitting the unit.
  • Leave breaker OFF: Until a qualified electrician inspects the charger, keep the breaker OFF to prevent further damage or fire risk.

This symptom almost always requires professional diagnosis. Internal components such as surge suppressors and rectifiers are not homeowner‑serviceable.

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Repair Difficulty

Professional Required 5/5

Required Part

GM Input Surge Protection / Power Module
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