Bosch
Control Pilot Signal Out of Tolerance
Bosch EV charger powers up and shows ready, but the vehicle will not start charging and shows 'charging station error' with no code on the charger.
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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
Incorrect control pilot voltage due to PCB fault, Damaged pilot conductor in cable, Poor connection at J1772 pilot pin, Vehicle-side pilot circuit incompatibility
How to Fix / Troubleshooting
Safety first: Turn OFF power before inspecting the connector.
- Inspect J1772 connector: Check the small pilot pin for corrosion, dirt, or mechanical damage. Clean gently with a dry brush.
- Test with another EV: If another vehicle charges normally, the issue may be with the original vehicle’s pilot circuit.
- Check cable strain relief: Ensure the cable is not pulled tight or sharply bent near the charger or handle, which can break the pilot wire.
- Professional diagnosis: A technician can measure the pilot waveform and resistance values to confirm if the Bosch main board or cable assembly is out of spec and replace the faulty component.
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Repair Difficulty
Hard
4/5
Required Part
Bosch J1772 Charge Cable and Handle Assembly
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