General Motors Internal Overheating / Component Failure

GM EV home charger emits a burning smell or visible smoke during or shortly after 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

Failed capacitor or resistor on GM power board, Overheated wiring at input lugs, Shorted semiconductor in power module, Arcing at main contactor

How to Fix / Troubleshooting

Safety first: Immediately stop charging, unplug the vehicle if safe to do so, and turn OFF the breaker. If smoke continues or flames are visible, call emergency services.

Steps after safe shutdown:

  • Do not reopen: Do not attempt to open the charger to investigate; internal components may still be energized.
  • Ventilate area: Open doors/windows to clear smoke.
  • Contact support: Contact GM support or your installer with details and photos if safe.

The charger must not be used again. Internal fire‑damaged components require full replacement of the GM charger.

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Repair Difficulty

Professional Required 5/5

Required Part

GM Power Conversion Module / Internal Wiring
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