General Motors No AC Supply / Internal Fuse Open

GM EV home charger has no power at all; no LEDs or display, and vehicle does not recognize the charger.

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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

Tripped or faulty double‑pole breaker feeding charger, Loose line connections at charger input, Blown internal input fuse on GM power module, Open thermal fuse due to prior overheating

How to Fix / Troubleshooting

Safety first: Do not open the charger enclosure unless you are a qualified electrician. High voltage is present inside.

Steps for homeowners:

  • Check breaker: Locate the dedicated GM charger breaker in your panel. If it is tripped, switch it fully OFF, then ON once. If it trips again immediately, leave it OFF and call an electrician.
  • Check other loads: Confirm that other appliances on different circuits have power to rule out a wider outage.
  • Inspect external wiring: Look for obvious damage to conduit or cable feeding the charger.

If the breaker stays on but the charger remains completely dead, an internal fuse or thermal protector may have opened. These are not typically user‑serviceable; contact a licensed electrician or GM‑authorized service provider for diagnosis and possible replacement of the charger.

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Repair Difficulty

Hard 4/5

Required Part

GM Input Fuse / Thermal Protector
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