The Hawaii Superferry ship Alakai last week entered drydock to repair the auxiliary rudders, parts that are designed to enhance passenger comfort.
Hawaii Superferry said it had moved up the date on its annual drydock and was taking advantage of the off-peak travel season to make the repairs.
Service is expected to resume on March 3.
Passengers holding reservations for affected voyages were being notified, re-accommodated on a future voyage or refunded and accommodated with partnering airlines and car rental companies, Superferry said.
Hawaiian Airlines was offering a 10% discount on available fares to affected customers, Superferry said.
Hawaii Superferry has run into delays and financial setbacks since its inaugural run between Oahu and Maui in August; regular service was halted for four months because of concern about the ships' environmental impact.
Regular service between the two islands resumed in mid-December, but a plan to start second service between Oahu and Maui was postponed in mid-January.