CP_a012
Tesla
Residual Current Device (RCD) Trip / Leakage Current Detected
App shows CP_a012; Wall Connector LEDs indicate error; charging is disabled
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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
Insulation breakdown in cable, Moisture inside Wall Connector, Faulty vehicle onboard charger causing leakage, Defective internal RCD module
How to Fix / Troubleshooting
Safety: Leakage current can indicate a shock hazard. Do not attempt to bypass RCD protection.
- Inspect for moisture: Check the Wall Connector enclosure, conduit entries, and cable gland for water. If moisture is present, the unit should be de‑energized and dried or replaced.
- Check cable and handle: Look for cuts, abrasions, or crushed sections. If damage is found, do not use the charger.
- Try another charger: If possible, charge the vehicle from a different Tesla charger to determine if the issue follows the car or stays with the Wall Connector.
- Insulation testing: A qualified electrician can perform insulation resistance tests on the branch circuit and, if supported, on the Wall Connector to locate leakage paths.
- Replace if needed: If external wiring and the vehicle are ruled out, the internal RCD or control board is likely faulty and the Wall Connector must be replaced.
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Repair Difficulty
Professional Required
5/5
Required Part
Tesla Wall Connector internal RCD / ground fault module
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