Volkswagen said production at its largest factory had been curtailed in some areas because of a supplies shortage caused by a parts maker refusing to keep to delivery commitments.
"A supplier has suspended the contractually agreed delivery of components," VW said in a statement cited by Reuters. "This is creating a bottleneck in production" at the Wolfsburg plant which builds the Golf hatchback, Tiguan SUV and Touran MPV as well as components.
VW declined to specify the impact of disruptions on output and staff to Reuters.
The company did not immediately return calls from just-auto seeking comment.
The Wolfsburg plant employs about 60,000 people and builds up to 3,800 cars a day at peak times.
VW reportedly said the regional court in Braunschweig, near Wolfsburg, last week issued an injunction that forces the supplier to resume deliveries but the company has not yet complied with the ruling.
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By GlobalDataTo contain the costs of the production losses, VW said it is considering flexible working hours in some parts of the Wolfsburg plant.
Material supplies at VW's key plant will only last this week, so upholding production next week is no longer guaranteed, Bild newspaper reported on Thursday, citing an internal memo to senior managers.
The disruptions coincide with similar problems in Emden, VW's northern German plant where a sister company of the supplier stopped deliveries of seat covers earlier this month, two sources close to VW were reported to have said.
VW last Monday said it would reduce working hours for about a third of the Emden plant's 9,000 staff, initially from 18 August to 24 August. Working hours at Wolfsburg may be cut too next week, Bild said.