The workshop manual states the following -
This circuit opens and closes the Intake Air Control valve (AICV) in response to the engine load in order to increase the intake efficiency (ACIS Acoustic control induction system)
When the engine speed is 4700rpm or more and the throttle valve opening is 60 degrees or more the the VSC is off, so the IAVC is open. All the other times the ECM turns the VSC ON and closes AIVC.
It seems this code could be triggered by a short circuit in the harness, a faulty valve (AICV) or a faulty ECU.
Other more qualified members may be able to advise you what to do in this case - but personally if the engine light is not flashing and the car is running OK I would do nothing for a while and see how things develop.
Regards
Ray