Kia
Acoustic Noise from Contactor or Transformer
Kia EV charger makes 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 mounting of main contactor, Worn or vibrating contactor coil, Loose transformer laminations on power board, Excessive mains voltage causing magnetostriction noise
How to Fix / Troubleshooting
Safety first: Unusual noise can precede failure. Do not open the charger with power on.
- 1. Compare to normal: Some low-level hum is normal. If the noise is new, louder, or accompanied by flickering lights, stop using the charger.
- 2. Check mounting: With power off, a technician can open the charger and verify that the contactor and any transformers are firmly mounted and that mounting screws are tight.
- 3. Inspect contactor: If the contactor buzzes excessively, its coil may be failing. Replacement of the contactor with a Kia-approved part is recommended.
- 4. Verify supply voltage: An electrician should confirm that supply voltage is within the charger’s rated range.
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Repair Difficulty
Medium
3/5
Required Part
Main Power Contactor
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