Chevrolet
Excessive Electrical Hum / Vibration
Charger or cable emits a loud humming or buzzing noise during charging.
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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
Loose contactor or transformer laminations, High load on undersized wiring, Resonance in mounting surface, Internal component nearing failure
How to Fix / Troubleshooting
Safety first: If the sound is accompanied by heat or burning smell, turn OFF the breaker immediately.
- Step 1 – Identify source: Listen closely (without opening the unit) to determine if the noise comes from the charger enclosure or the panel/breaker.
- Step 2 – Check mounting: Ensure the charger is firmly mounted to a solid surface; loose mounting can amplify normal hum.
- Step 3 – Inspect connections: With power OFF, check that all terminal screws are tight in the charger and at the breaker.
- Step 4 – Monitor operation: If the hum is mild and there are no other symptoms, it may be normal magnetics under load. If it grows louder over time, schedule service.
- Step 5 – Replace noisy component: A loudly buzzing contactor or transformer should be replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Main Power Contactor / Internal Transformer (if present)
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