tildaeule79

V40 battery drain

I'm having battery issues with my 2004 Volvo V40 diesel. I'm getting an error message in the speedometer, weak lights, and an error code. The battery is also weak when starting. Could a bad battery sensor be the problem?

A 2004 Volvo V40 diesel was experiencing battery issues, including error messages, weak lights, and starting difficulties. The problem was suspected to be a parasitic drain potentially caused by a faulty battery sensor. After inspection, it was confirmed that the battery sensor was defective. Replacing the sensor resolved the charging system issues.

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4 comment(s)

I drive a V40 too, though a newer one, and had similar issues. Have you checked the battery terminals for corrosion or if they're loose? How old is your battery?

Thanks. The terminals are clean and connected properly. The battery is about three years old. Could a bad battery sensor be causing a parasitic drain?

A parasitic drain from a faulty battery sensor is possible. But without proper equipment, it's hard to say for sure. Given the symptoms, I'd suggest having the charging system checked by a technician at a good shop. The repair would be around 315€.

Thanks for the advice. I had it inspected, and it was a defective battery sensor. I replaced it, and the charging system is working now. Thanks again for the expert help.

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VOLVO

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V40