* Kobe Steel reputation in tatters, CEO says
* Ministry says managers involved
* General Motors checking impact of data tampering
* Kobe Steel shares stabilize in early trading (Recasts with CEO, ministry comments, updates shares)
By Yuka Obayashi
TOKYO, Oct 12 (Reuters) - Kobe Steel's CEO said on Thursday the firm's data-fabrication may have spread beyond Japan, as he was ordered by the government to report on how the misconduct occurred and address safety concerns that have sparked a scare along global supply chains.
Hiroya Kawasaki told reporters the cheating scandal has left Kobe Steel's credibility at "zero," underscoring the deepening crisis at the steelmaker and the sweep of quality problems besetting Japan's once-vaunted manufacturing sector.
"The credibility of Kobe Steel has plunged to zero. We will make efforts to regain trust as soon as possible," Kawasaki, 63, told reporters after meeting government officials.
A senior government official said managers at Kobe Steel were involved in fabricating data on products used in planes, trains and automobiles, but Kawasaki said his current priority is to deal with safety checks with its clients. The official did not elaborate.
The company has found possible further cases of tampering, the CEO said, including in overseas operations.
The Ministry of Economy, Trade and Industry ordered Kobe Steel to report on the results of safety checks within about two weeks and the reasons for the tampering, along with prevention measures in under a month.
He said he was not expecting to see recalls of cars or airplanes for now and none of the company's customers have cancelled orders. Kobe Steel has no plans to sell assets at the moment, Kawasaki said.
Shares in Kobe Steel stabilized on Thursday after investors, worried about the financial impact and potential legal fallout, wiped about $1.6 billion off its market value in two days.
The shares were up 0.9 percent by around 0424 GMT, compared with an 0.5 percent gain in the Nikkei 225.
The cost of insuring against default on Kobe Steel’s debt has risen sharply this week as the scandal unfolded. Five-year credit default swaps were at 57 basis points on Oct. 5 and last traded at 305 basis points on Wednesday. They were indicated at between 200 and 260 basis points on Thursday.
In the U.S., General Motors said it is checking whether its cars contain falsely certified parts or components sourced from Kobe Steel, the latest major automaker to be dragged into the widening scandal.
"General Motors is aware of the reports of material deviation in Kobe Steel copper and aluminium products," spokesman Nick Richards told Reuters. "We are investigating any potential impact and do not have any additional comments at this time"
GM joins automakers including Toyota Motor Corp and as many as 200 other companies that have received parts sourced from Kobe Steel.
The steelmaker admitted at the weekend it had falsified data about the quality of aluminium and copper products used in cars, aircraft, space rockets and defence equipment.
Late on Wednesday it said it had found 70 cases of tampering with data on materials used in optical disks and liquid crystal displays at its Kobelco Research Institute Inc, which makes and tests products for the company.
It also found one case of falsified data on iron powder products - material used for car parts such as gears - that were shipped to a customer.
The company has said it was examining possible data falsification going back 10 years - a familiar echo of a string of other cheating scandals involving Japan inc.
The corrosive business practices have raised broader questions over corporate governance in Japan, and cast doubt on the integrity of a manufacturing industry once the envy of the world.
Previous cases in Japan involving falsified data included Nissan Motor, Mitsubishi Motors and Takata, which filed for bankruptcy this year over faulty airbags that were blamed for 17 deaths and scores of injuries.
In 2015, it was revealed that Toyo Tire & Rubber fabricated data to secure government approval for materials to absorb shocks from earthquakes. Conglomerate Toshiba Corp is still battling the fallout of a scandal over reporting inflated profits.
Additional reporting by Nick Carey in DETROIT & Naoyuki Katayama in TOKYO; Writing by Aaron Sheldrick; Editing by Kenneth Maxwell & Shri Navaratnam