Citroen C8 Undervoltage Issue

I had a similar problem with my C8 a while back with very similar symptoms. Have you had the battery health checked recently? It could also be an alternator issue, causing insufficient power supply. I suggest investigating voltage drops. How old is your battery?

Thanks! I haven't checked the battery health recently, but it's probably a few years old. How did you resolve your issue? Was it a faulty battery, alternator, or something else?

In my case, the problem was a heavily discharged battery due to a faulty cell. I had it replaced at a workshop. Given your symptoms and the potential age of your battery, it might be worth going to a professional for diagnostics.

Thanks! I took it to a local mechanic, and they confirmed it was a defective battery. They replaced it, and everything seems to be working fine now. The repair cost me 290€.