Peugeot 106 Overvoltage

Hi, I'm having a strange issue with my 2003 Peugeot 106, gasoline engine. It's showing signs of overvoltage. I'm getting many fault memory entries about it, and various systems seem to be failing intermittently. Also, the battery seems weak when starting, and generally there's just a feeling of electrical malfunction. The car has 216854 km on it. Any ideas?

4 comment(s)

Whoa, overvoltage on a 106? Sounds gnarly. I had something similar on my 106 a while back. Did you check the car battery? That was my issue. Heavily discharged or defective cell can cause all sorts of weirdness.

Interesting! I wouldn't have thought of that. How did a bad battery cause overvoltage errors though? I would have expected undervoltage.

Yeah, it's counterintuitive, I know! The ECU gets wonky readings and tries to compensate, leading to voltage spikes. If the battery is heavily discharged the voltage regulator goes nuts. Honestly, just go to a workshop and ask them to do a load test on the battery and check the alternator output. It's the best way.

Okay, thanks for the advice! I took it to a shop, and you were right – the battery was shot. Replaced it, and the overvoltage errors are gone. Total cost was 290€ for the battery and diagnostics. Appreciate the help!

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