Volkswagen AG (VOWG_p.DE) is confident it may reach an agreement with U.S. regulators on a technical fix for diesel cars, vehicle buybacks and fines, Chief Executive Matthias Müller said on Monday. The U.S. Justice Department has sued Volkswagen for up to $46 billion for violating U.S. environmental laws‎. There is still no fix for nearly 600,000 affected cars in the United States more than five months after VW's emissions test-rigging scandal broke.

"In the U.S. we are working intensely with the respective authorities ‎on a sustainable overall solution," Müller said at a reception on the eve of the Geneva auto show.

"We continue to be in constructive talks," he said, adding that negotiations between both sides will resume on Thursday. Earlier on Monday, Müller told Reuters TV that he did not believe that U.S. authorities were being too hard on the German carmaker, though they were pushing "very strongly" steps to clear up the scandal.

VW is "progressing well" in its efforts to investigate the circumstances of the manipulations and will draw "the right conclusions" from its findings, due to be published in the second half of April, the CEO told reporters.

Müller also said in the interview that Europe's biggest automaker will succeed in winning back customers' trust after admitting to the cheating which it has said affects 11 million cars globally.

"We have started a lot of customer-relation programs, I'm very convinced it will work very well," he said.

The Wolfsburg-based manufacturer has pledged to increase electric-car offerings and is pushing new technologies and digitalization as it aims to overcome its crisis.

VW will set up sites in Europe, California and China where specialists aim to align car design and connectivity matters more closely, and take steps "to massively promote" autonomous driving features, according to Müller.‎

"Digital transformation is moving right to the top of the agenda," he said.