E12
Jaguar Internal Communication Bus Failure (Main PCB to Communication Module)

Charger shows E12; app indicates ‘Wi‑Fi module error’ or ‘Network module fault’.

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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 communication module connector, Failed Wi‑Fi/4G communication daughterboard, Corrupted firmware on comms module, Internal PCB bus fault

How to Fix / Troubleshooting

Safety first: Network faults do not usually affect electrical safety, but always isolate power before opening the unit.

  • Step 1 – Power cycle: Turn off the charger for 2 minutes, then restore power and check if E12 clears.
  • Step 2 – Check external network: Ensure your router or network is functioning. However, E12 typically indicates an internal module issue, not internet outage.
  • Step 3 – Reseat communication module: With power OFF, open the charger and locate the Wi‑Fi/4G module plugged into the main PCB. Carefully unplug and replug it to ensure a solid connection.
  • Step 4 – Firmware update: If possible, update firmware via USB or service port as per Jaguar instructions.
  • Step 5 – Replace module: If E12 persists, replace the Jaguar communication module with an identical part. If that fails, the main PCB bus may be defective.
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Repair Difficulty

Medium 3/5

Required Part

Jaguar Wallbox Wi‑Fi / Communication Module
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