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Renault Modus Overvoltage Issue

Having trouble with my 2012 Renault Modus, diesel engine. Seeing signs of overvoltage, with many related fault codes. Systems are acting up, and the battery seems weak on startup. Odometer reads 57998 km. I've checked the fuses. Could a dead battery be the cause?

The 2012 Renault Modus was experiencing overvoltage issues, with multiple fault codes and a weak battery on startup. The problem was identified as a defective battery causing electrical issues. The solution involved replacing the battery and performing a system reset, which resolved the overvoltage problem.

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4 comment(s)

Sounds like what happened with my old Opel Astra. It was a faulty voltage regulator in the alternator causing power surges and frying the ECU. Did you notice any burning smell at first?

Thanks. No burning smells. Could the alternator be the problem even with a weak battery?

In my case, the weak battery was because of the overcharging that damaged it. Get it to a workshop for a proper diagnosis. They can check the alternator and battery. Don't risk damaging more electronics.

Thanks for the advice. The workshop confirmed it: defective battery led to overvoltage and electrical issues. Replacing the battery and a system reset cost 290€. Sorted!

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RENAULT

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MODUS