DS4 Hybrid Overvoltage Faults

Those symptoms – electrical failures and battery drain – suggest an overvoltage problem. What events happened before this, like a jump start or electrical mods? It's important to find the root cause before doing repairs.

There were no jump starts or modifications. Given your past DS4 experience, what was your diagnosis and fix?

My overvoltage came from a faulty voltage regulator, causing voltage spikes that damaged the electronics. Given the potential severity, I'd advise a professional diagnostic assessment at a reputable workshop.

Following your recommendation, a technician found a defective battery. Replacing it for 290€ fixed the issues. The car is now running normally.