V40 Fault Memory Lock Active Undervoltage

I had something similar with my V40! Is the car struggling to start, or are any of the electronics acting strangely? It could be a dodgy battery or alternator. I'd get the battery checked first.

Thanks for the quick reply. The car starts normally, and the electronics seem fine. Could undervoltage still be the issue, even without those symptoms?

Yes, it's possible. Even if everything seems normal, a slight undervoltage can trigger those kinds of ECU faults and lock the memory. Honestly, with fault memory issues like that, it's best to get it properly diagnosed at a workshop to pinpoint the exact cause.

Understood. Thanks for the advice. I took it to a workshop, and it was indeed an undervoltage issue. The repair cost me 240€. Your input was very helpful!