Ford Motor Co said on Wednesday that Raj Nair, its president for North America, was leaving the company immediately after an internal investigation found his behaviour was "inconsistent with the company's code of conduct".
Ford did not give any details on what that behaviour entailed. A company spokesman said the review was launched in the past few weeks after Ford received a report of inappropriate behaviour, but it was not clear what the nature of the allegations were.
Mr Nair's departure comes after several high-profile business leaders and politicians have quit or been fired in the past year following accusations of inappropriate behaviour including sexual harassment, with the social media movement known as #MeToo pressing for more accountability in corporate cultures.
"We made this decision after a thorough review and careful consideration," said Ford chief executive Jim Hackett in a statement.
"Ford is deeply committed to providing and nurturing a safe and respectful culture and we expect our leaders to fully uphold these values."
We made this decision after a thorough review and careful consideration
Ford chief executive Jim Hackett
As North American chief, Mr Nair was responsible for operations that generate about 90pc of Ford’s global profits.
Mr Nair apologised, without elaborating.
"I sincerely regret that there have been instances where I have not exhibited leadership behaviours consistent with the principles that the company and I have always espoused," he said in Ford's statement.
The company is not investigating other executives for similar cases, a Ford spokesman said.
Mr Nair, 53, was appointed to his current position last May when Mr Hackett became CEO of the No 2 US automaker.
Mr Nair previously served as Ford's chief technical officer. He joined Ford in 1987 and rose through the automaker's manufacturing and engineering ranks to become head of global product development in 2015.
He stands to lose about $4.8m (£3.5m) worth of Ford restricted shares he was granted in May 2017 that would have vested had a remained with the company until May 2020.
In August, Ford agreed to pay up to $10.125m to settle an investigation into sex and race harassment at two plants in Chicago conducted by the US Equal Employment Opportunity Commission (EEOC).
The EEOC said female and African-American employees had been subjected to sexual and racial harassment and found the automaker retaliated against employees who complained about the harassment or discrimination.