S90 Diesel Battery Drain

I'm having trouble with my 2019 Volvo S90 diesel. The battery keeps discharging, I get an error message on the speedometer, the lights are weak and flicker, and there's an error stored in the memory. The engine struggles to start. Any ideas?

4 comment(s)

That sounds frustrating! I had something similar with my old car. Weak battery symptoms can be a real pain. Have you checked the battery terminals to make sure they're clean and properly connected? Maybe test the alternator to see if it's charging the battery correctly?

Thanks, I've checked the terminals and they're clean and secure. How do I test the alternator effectively? I don't have specialized tools.

Without proper tools, testing the alternator yourself might be tricky and risky. Based on your symptoms, especially the error message, stored error, and that it is a modern vehicle, the battery sensor may be faulty. I'd really recommend getting it checked out professionally at a workshop to avoid damaging anything further. Better safe than sorry!

I took it to a workshop as you suggested. They found a defective battery sensor and replaced it. The repair cost 315€. The issue is resolved. Thanks for the help.

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