Executives from Vauxhall owner General Motors (GM) have met the UK business secretary amid concerns over plans to merge its loss-making European unit with Peugeot.
GM said it was in talks with Peugeot owner PSA Group "to build on the success" of Vauxhall and to put it in "the strongest possible position".
Vauxhall employs 4,500 staff in the UK at plants at Ellesmere Port and Luton.
Business Secretary Greg Clark said he had been reassured about those jobs.
"There is some way to go in discussions between GM and PSA, but I was reassured by GM's intention, communicated to me, to build on the success of these operations rather than rationalise them," Mr Clark said.
Vauxhall has said a further 23,000 people work in its UK showrooms and 7,000 in its UK supply chain.