Peugeot iOn ABS Fault

A speed signal fault affecting the ABS and traction control on an electric Peugeot iOn is concerning. When you say 'defective control unit,' are you referring to the ABS control module itself? Have you checked the ABS sensors for damage or corrosion, or run a diagnostic scan to pinpoint the specific sensor? It's possible a faulty sensor is sending incorrect data, triggering the ABS malfunction.

Thanks! Yes, by 'defective control unit' I mean the ABS control module. I've looked at the ABS sensors, and they seem okay, but I haven't done a diagnostic scan to find a specific sensor. Could a failing wheel speed sensor look like a faulty ABS control module?

It's possible for a faulty wheel speed sensor to mimic those symptoms. But, given the age and mileage, a failing ABS module wouldn't be unexpected. Before buying a new module (which can be costly), get a mechanic to do a thorough diagnostic assessment. They can read the signals from each wheel speed sensor and see if one is sending bad data. It might save money. But in the end, I would suggest to go to the workshop for diagnostics.

Thanks for the advice to get a professional diagnosis. I did, and it turns out the control unit was defective. The issue is resolved. The repair cost was 1000€.