V50 Overvoltage Electrical Faults

Hi, I'm having electrical issues with my 2006 Volvo V50 diesel. The fault memory is full of overvoltage errors, causing system failures. The battery seems weak when starting. It's done 67965 km. I suspect the battery is heavily discharged or defective. Anyone seen this before? How did you diagnose and fix it?

4 comment(s)

Hey, I had something similar with my V50. Loads of error codes. Have you checked the voltage regulator? That was the culprit for me. Also, double-check all your grounding points. A bad ground can cause weird electrical issues.

Thanks for the quick reply. I appreciate the voltage regulator suggestion. Could you tell me which grounding points I should check? Also, did you notice any symptoms besides the error codes?

Yeah, I had the same weak battery issue. The car struggled to start sometimes. I'm no expert, but my local shop traced it to the regulator overcharging, which eventually cooked the battery. Tracing grounds can be a pain. If you're not comfortable with electrics, it might be worth getting it checked out professionally. Cost me about 290€ all in.

Thanks for sharing your experience. I took the car to a workshop for a full electrical diagnosis. They confirmed the overvoltage and found a defective voltage regulator, which has probably drained or damaged the battery. Thanks for pointing me in the right direction!

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