Volkswagen is having a hard time agreeing with the US authorities on a fix for the diesel models involved in the emissions scandal.

The news came from an anonymous VW source who spoke to Reuters, revealing the tense relations between the two parties almost four months after the reveal of the Dieselgate scandal.

The German company will continue the negotiations with the Californian Air Resources Board and with the US Environmental Protection Authority, hoping to reach an agreement by mid-January, where their deadline expires.

The US Justice Department filed a lawsuit against Volkswagen AG which could result to a fine of up to $48 billion, showing that the company has still a long way to go in order to leave the emission scandal behind them.

VW’s CEO Matthias Mueller is expected to meet with EPA and politicians next week after visiting the Detroit Motor Show, with the company declining to comment on the progress of the talks with the EPA.

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