V90 High Voltage System Error

Alright, I'm officially stressed. I've got a 2023 Volvo V90 hybrid, and just hit 206384 km. Today, a 'High Voltage System Error' message popped up. The engine just shuts off randomly, and sometimes I get a 'Reduced Engine Power' warning beforehand. I scanned for codes, and there's an error stored, but I don't have the equipment to dig deeper into the high-voltage system. I've checked all the regular stuff, like making sure everything is plugged in properly, but nothing seems obviously loose or damaged. Anyone else seen anything like this?

4 comment(s)

Sounds like an electrical fault. Have you had any battery warnings recently?

No specific battery warnings besides the 'High Voltage System Error' message. Is there a specific area of the electrical wiring I should check?

Probably the battery itself. Given the symptoms and error message, plus the mileage, it points to a heavily discharged or defective battery. You'll need a workshop to test it.

Thanks. I took it to the workshop as suggested. Turns out you were right; the battery was heavily discharged. They replaced a faulty module, and the error is gone. Cost me 290€, but at least it's sorted!

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