Harald Krüger said a no-deal Brexit would be a “lose-lose” scenario for the UK and his business and urged him to think again.
In a briefing with journalists in Frankfurt, Mr Krüger was asked whether he had a message for the new Prime Minister.
He said: “Listen to the economy and listen to the people. You need to have a dialogue with business. I would visit Johnson to tell him this.”
Mr Krüger’s words were echoed by Ford’s president of automotive, Joseph Hinrichs, who told the BBC that Brexit meant the months ahead were a “bit of a rocky road”.
He added: “The odds of a no-deal Brexit certainly have increased… The key is going to be, whatever happens, what happens at the borders, what happens in the ports and, importantly, what happens to the pound.”
BMW has previously warned that a no-deal Brexit could stop production of the Mini at its Cowley plant, near Oxford, where 4,500 jobs would be at risk.
Future trade deals
Leading proponents of Brexit, including Mr Johnson, have long claimed that a future trade arrangement with the EU would be straightforward because German carmakers such as BMW would want to do business with post-Brexit UK, even in the event of no deal.
Mr Krüger was speaking as his company announced a fall in profits due to higher costs of investing in electric vehicles. He is due to step down as CEO in two weeks’ time.
Mr Johnson has set out a hardline position on talks with fellow EU leaders to try to reach a new deal, despite it being the heart of his Brexit strategy, insisting they must be open to renegotiating the withdrawal agreement.
Downing Street declined to comment on Mr Krüger’s words.