General Motors Excessive Operating Temperature Without Trip

GM EV home charger gets very hot to the touch during charging, even at moderate current, but continues to operate.

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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

Blocked ventilation, High ambient temperature, Degraded thermal interface material on heat sink, Dust buildup on internal heat sink fins

How to Fix / Troubleshooting

Safety first: If the enclosure is uncomfortably hot, stop charging and turn OFF the breaker.

Steps:

  • Improve airflow: Clear storage items from around the charger and ensure vents are not covered.
  • Reduce current: Use the GM app or settings to lower the maximum charging current and observe if temperature improves.
  • Charge during cooler hours: Schedule charging for nighttime when ambient temperatures are lower.

If the charger still runs excessively hot at reduced current and with good airflow, internal thermal management may be compromised. Continued use can shorten the life of the GM power module; consider professional evaluation or replacement.

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Repair Difficulty

Medium 3/5

Required Part

GM Power Module Heat Sink / Thermal Interface
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