OBD2 fault codes but no warning light

Hello,

I recently scanned the car with an OBD2 scanner. It produced 3 error codes:

P332500 - Power supply terminal 15, Implausible;

P15700 - Engine Control Module (ECM) disabled;

P334B00 - Charge pressure actuator, mechanical malfunction.

I wondered if these were significant? I should mention that there has been NO warning lights appear at all in the few months I have owned the car (3 years old). Could these codes be stored in the computer from a previous, resolved issue? Or are they simply not significant enough to prompt a warning light? Had I not scanned that car I would have been completely unaware of anything. The car drives fine with absolutely no noticeable issues.

Many thanks,

Ian