simonjones1

Aygo Overvoltage Errors

I'm experiencing a disconcerting issue with my 2006 Toyota Aygo diesel. I'm getting many fault memory entries relating to overvoltage, with subsequent failure of various systems. The car also seems to struggle to start sometimes, like the battery is weak. Mileage is currently at 31909 km. Could it be a power surge? Is this a common issue?

The 2006 Toyota Aygo diesel is experiencing overvoltage errors and system failures, with starting difficulties suggesting a weak battery. A potential cause could be a faulty voltage regulator in the alternator, leading to overcharging. The issue was resolved by replacing a heavily discharged and defective battery, which eliminated the overvoltage errors.

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4 comment(s)

I had a similar experience with my old 2012 Renault Megane, although the symptoms were slightly different. It sounds like the voltage regulator in your alternator might be faulty, like a tap that's stuck on full blast, constantly overcharging the system. Have you checked your battery's voltage with a multimeter while the engine is running?

Thanks for the quick reply! I don't have a multimeter, I'm afraid. I'll ask a friend. But if it is the voltage regulator, could the battery issue have caused it? Or is it more likely the regulator failed and then damaged the battery?

It's a bit of a chicken-and-egg scenario, isn't it? In my case with the Megane, the garage suspected the failing regulator had killed the battery. I would recommend getting it checked by a professional with proper diagnostic tools. It's a safety issue, really.

Thank you! I appreciate the advice. It turns out the battery was heavily discharged and defective, causing the overvoltage errors. Replacing it fixed the issue - the total repair cost was 290€. This was a huge help!

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TOYOTA

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AYGO