The chief executive of Birmingham van maker LDV has unexpectedly quit after less than 18 months in the job.
Steve Young, aged 52, said in a letter to suppliers that he was leaving "for personal reasons with effect from the end of the year".
He also said he wanted to "pursue other opportunities in the industry".
A former Ford executive, he was part of a new top executive team installed by Russian commercial vehicle group Gaz after it bought LDV from US private equity group Sun in August 2006. He told The Birmingham Post that there had been no dispute between himself and other group executives.
"Because of some personal, family reasons it suits me to leave LDV now," Mr Young said. "From a business point of view we have got the company stablised and integrated with Gaz so this is a convenient point to go.
"Other factors aside, I would have stayed longer."
In a statement issued by LDV's PR agency, Mr Young said: "This was not an easy choice for me, but LDV is a great company with a loyal and dedicated workforce and a highly competitive award-winning product. I am confident that LDV will continue to develop and satisfy an increasing number of informed customers around the world. I wish GAZ and LDV well for the future."
LDV chairman Martin Leach, another ex-Ford man, will take over Mr Young's duties until a new chief executive is appointed. His seat on the board will be taken by Eugeny Vereschagin, chief financial officer of the GAZ power train division.
Mr Leach said: "The business has through enormous change over the last 18 months with new products, new markets and significant improvements across the board in all aspects of performance.
"Steve provided invaluable leadership in these changes, whilst building confidence in LDV and the Maxus product as a real alternative to the major players in the light commercial vehicle market."
LDV has ramped up production of Maxus in the past 18 months but suffered a setback earlier this month when the plant was put on a three day week as demand slumped in the runup to Christmas.
An unknown number of agency staff were laid off as the company acted to cushion the impact of the seasonal downturn.