Around 500 jobs are under threat as the Honda plant in Swindon are to cut productions.
340 Honda jobs and 160 agency staff could potentially lose their jobs at the Wiltshire based plant.
Most cars built at the Wiltshire based plant are exported and sales in other countries have not been as strong as in the UK.
Honda say it will enter into consultation on the proposal.
As well as moving to two shifts, production will be consolidated on to one line, to "improve production, flexibility and efficiency" while production volumes continue at the current level.
The car manufacturer has been in Swindon since 1992.
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