Corsa Central Locking Failure

That sounds inconvenient! Have you checked the key fob battery? I had a similar issue once. Also, is the car alarm going off randomly, or is it behaving normally? A faulty alarm can interfere with the central locking.

I replaced the key fob battery already, and the alarm seems fine. Any other ideas before I dig deeper?

With the fob battery and alarm ruled out, it sounds more serious. Given the error code and your suspicion of a cable or plug issue, I'd advise against further self-diagnosis. Modern systems are sensitive, and you could cause more damage. A reputable workshop seems wisest.

Took it to a Vauxhall service center. It was a defective connector in the central locking system, as suspected. Repair was 95€. Thanks; your advice saved me from making things worse.