Vauxhall owner General Motors (GM) has pushed up the cost of buying its vehicles in Britain and is eyeing a production cut in Europe as its grapples with the impact of the Brexit-hit pound.
The US motor giant more than doubled net income to $2.77bn (£2.3bn) in the third quarter, but suffered a $100m (£82.4m) blow from the slump in sterling.
The firm said it had to raise UK car prices by 2.5% on October 1 after the EU referendum result caused the British car industry to hit a "speed bump".
GM warned that if the pound continues to flag throughout the rest of this year then it could take an earnings hit of around $300m (£247m) in the fourth quarter.
It said its European arm was on course to break even before the Brexit vote, but may now struggle to meet its full-year profit targets for the region.
Chief financial officer Chuck Stevens told the Financial Times he would not rule out a possible capacity cut in Europe.