MICHIGAN, United States — GENERAL Motors’ CEO Frederick “Fritz” Henderson has resigned after eight turbulent months as head of the largest US automaker.

The company said yesterday that Chairman Ed Whitacre Jr will serve as interim CEO. The company plans an international search for a new president and chief executive.

At a press conference here, Whitacre read a brief statement thanking Henderson for his work during a period of challenge and change.

Henderson, 51, succeeded Rick Wagoner on March 29 after theompany worked through a government-led reorganisation.

Henderson spent the next few months working with the government to reorganise the automaker outside of bankruptcy, but eventually took the company into bankruptcy protection in June.

With the government’s help, the company emerged from court protection in just 40 days cleansed of massive debt and burdensome contracts that would have sunk it without federal loans.

Henderson continued to downsize the automaker after its emergence from bankruptcy. He sought to scale down GM to just four core brands: Chevrolet, Cadillac, Buick and GMC.

While he has largely succeeded in that goal, attempts to sell the company’s other brands have hit obstacles.

The company is winding down Pontiac and was successful in winning a tentative sale of Hummer to a Chinese construction machinery maker.

However, Henderson’s bid to sell Saturn to racecar mogul Roger Penske fell through and the brand is now liquidating. Last week, Swedish sports car maker Koenigsegg Automotive AB dropped out of a deal to buy Saab.