Volvo S90 starting problem

Had a similar issue with my 2016 Opel Astra. 'Check engine' light came on, and it wouldn't start. Did you check the battery terminals for corrosion?

Terminals look clean. By 'corrosion', do you mean white, powdery stuff, or something else?

Yeah, the white stuff. But if they're clean, and the engine still won't turn over, it might be an ECU issue. I'd get it checked by a workshop.

You were right. Bad cable connections. Cost me 155€ to fix. Thanks!