And P&O Ferries have confirmed that a full investigation will know be carried out.
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A spokesperson said the European Causeway travelled to Larne "under its own propulsion".
The spokesperson said: "Following a temporary mechanical issue, the European Causeway is now continuing on its scheduled journey to the Port of Larne under its own propulsion, with local tugs on standby, where it will discharge its passengers and cargo as planned.
"There are no reported injuries onboard and all the relevant authorities have been informed.
"Once in dock, a full independent investigation will be undertaken."
According to P&O the incident occurred due to a mechanical issue in the Irish sea.
And TalkTV editor Kate McCann tweeted that crew members onboard the ferry are "refusing to work on the vessel again".
The post read: "I understand a number of crew on board P&O's European Causeway, which lost power off Larne, are refusing to work on the vessel again because of concerns about safety. They are worried that an inexperienced crew in the engine room made the problem worse.
A RNLI spokesperson said that three lifeboats had been sent to the scene.
It is understood the Queen Victoria cruise ship, en route to Belfast for a refit, were also on site, along with a coastguard helicopter from Prestwick.
The Rail, Maritime and Transport workers' Union (RMT) said the reports were "deeply concerning, not least for the agency crew and passengers onboard".