General Motors Corp. shares fell almost 5 percent on Friday after the automaker said the three-month strike by the United Auto Workers at American Axle & Manufacturing Holdings AXL is expected to cost $1.8 billion after leaving production.

Shares of GM ended Friday down 83 cents at $17.60.

UAW said it had ratified a new labor agreement with auto components and systems maker American Axle on Thursday. American Axle said Friday it expects production to resume next week.

In a regulatory filing, GM said the pause in the work flow had affected approximately 30 plants in North America and resulted in lost production of 230,000 vehicles. The total impact was roughly $1.8 billion on second-quarter pretax earnings.

In the first quarter, the auto maker said the strike caused a loss of 100,000 production units, which had an estimated impact on earnings before tax of around $800 million.

The strike began February after 3,650 employees, represented by the UAW, went on strike at the company's plants in New York and Michigan.

General motors