UK car production dropped by 10.6% year on year in July.
The decline prompted the Society of Motor Manufacturers and Traders (SMMT) to renew its call for a swift Brexit deal.
The society also blamed “ongoing weakness in major EU and Asian markets, coupled with some key model changes”.
It was the 14th successive month of falling figures released by the SMMT.
Mike Hawes, SMMT chief executive, said:
“Another month of decline for UK car manufacturing is a serious concern.
“The sector is overwhelmingly reliant on exports and the global headwinds are strong, with escalating trade tensions, softening demand and significant technological change.
“With the UK market also weak, the importance of maintaining the UK’s global competitiveness has never been more important so we need a Brexit deal – and quickly – to unlock investment and safeguard the long-term future of a sector which has recently been such an international success story.”
A total of 108,239 cars were made in the UK in July – down 12,812 on the same time last year.