Insignia Overvoltage Errors

I'm having a nightmare with my 2016 Vauxhall Insignia (gasoline engine). I keep getting overvoltage errors and 'many fault memory entries relating to overvoltage' popping up. This seems to be causing all sorts of issues – various systems are failing, the battery feels weak when starting, and there's just a general electrical malfunction vibe. The car has 162360 km on the clock. Any ideas what could be causing this?

4 comment(s)

Sounds rough! I had a similar thing with my old Peugeot 308. Overvoltage can be a real pain. Have you checked your battery? A heavily discharged or defective battery can sometimes cause the voltage regulator to go haywire, leading to overvoltage situations. It's worth a look before diving into more complex stuff.

Thanks for the tip! When you say 'check the battery', what exactly do you mean? Should I just test the voltage, or is there something else I should be looking for?

Yeah, start with a voltage test, but also check the battery's overall condition. See if there's any corrosion on the terminals, and if you can, get it load tested. If the battery is failing, the alternator might be overcompensating, leading to your overvoltage issue. Though honestly, with electrical gremlins like that, it's often best to get it properly diagnosed at a workshop.

Thanks! You were spot on. The battery was indeed heavily discharged and defective. Replaced it, and the overvoltage errors are gone! Repair cost me 290€. Really appreciate the help!

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