Espace Hybrid Fault Memory Lock

A memory lock issue on a relatively new hybrid vehicle is indeed perplexing. Have you checked the 12V auxiliary battery? Sometimes, even if the main hybrid battery is fine, a weak auxiliary battery can cause all sorts of electronic gremlins. Were there any unusual electrical events recently, like a jump start or leaving the lights on for an extended period?

I haven't checked the 12V battery myself; I'm not confident working with hybrid systems. I didn't jump-start it or leave the lights on, either. Could undervoltage genuinely cause a fault memory lock, or is there something more sinister at play?

Undervoltage, especially in modern vehicles with extensive electronic control units (ECUs), can trigger a cascade of errors, including memory locks. Because of the relatively new car it is likely to be the 12V battery and not a faulty ECU, but I would not be sure. Given it's a hybrid and you're not comfortable, and that there is already a 'Fault memory lock active' error, I recommend visiting a workshop to run a more accurate ECU diagnostics. I'm afraid there is not much you can do yourself to fix the issue.

Thanks for confirming my fears. I appreciate the advice. I took it to the workshop, and you were right - it was indeed undervoltage! They replaced the auxiliary battery and cleared the error codes. Cost me 240€, but at least it's resolved.