BMW Intermittent Connection / Thermal Cutback

BMW Wallbox intermittently stops charging mid-session without clear error; charging resumes after reconnection

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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 connection at vehicle inlet or Type 2 plug, Overheating at plug contacts due to wear, Marginal Wi‑Fi or backend communication causing session aborts, Internal temperature sensor triggering derating

How to Fix / Troubleshooting

Safety first: Do not touch hot metal contacts. Allow components to cool before inspection.

  • Check plug fit: Ensure the Type 2 plug fits snugly in the vehicle inlet. Excessive play can cause intermittent contact.
  • Inspect for discoloration: Look for browning or melting around the plug pins or vehicle inlet. This indicates overheating and requires component replacement.
  • Monitor temperature: If charging stops on very hot days, reduce the maximum current in the BMW Wallbox settings and improve ventilation around the unit.
  • Check network stability: If using smart features, ensure your internet connection is stable; try disabling remote control features temporarily to see if behavior improves.

Persistent mid-session dropouts with visible heat damage or no network issues suggest worn contacts or internal thermal problems. A BMW-certified technician should inspect and possibly replace the cable assembly or internal power module.

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Repair Difficulty

Medium 3/5

Required Part

BMW Wallbox Type 2 Plug and Contact Assembly
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