Siemens Control Pilot Signal Level Incorrect

Vehicle reports ‘charging station locked’ or ‘no response’ and Siemens charger shows normal idle lights but never starts charging (no error code).

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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

Misadjusted or faulty control pilot generator on main board, High resistance connection in CP wire to socket, Contamination on CP pin in Type 2 connector, Vehicle-specific incompatibility with pilot tolerance

How to Fix / Troubleshooting

Safety first: Isolate power before accessing internal wiring.

  • Test with another vehicle: Determine if the issue is specific to one EV or affects all vehicles.
  • Inspect CP pin: Check the Type 2 plug/socket CP pin for dirt, corrosion, or mechanical damage. Clean with contact cleaner and a soft brush.
  • Check cable strain: Ensure the tethered cable has not been pulled sharply, which can damage the CP conductor.
  • Firmware update: Install the latest Siemens firmware, which may improve compatibility with certain vehicles.

If multiple vehicles cannot start charging and no error is shown, a technician should measure CP voltage and duty cycle; if out of spec, the main control board likely needs replacement.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board (Control Pilot Circuit)
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