Action raises the number of vehicles the automaker has recalled so far this year to almost 15.4 million.
Ouster of Gregg Steinhafel has triggered concerns the retailer might have even more bad news for investors.
Safety advocates say automaker should advise owners to take vehicles off the road until they are repaired.
Recalls involve 27 Toyota models, the Pontiac Vibe and the Subaru Trezia.
As it navigates massive recall, GM is said by watchdog to have another issue with air bags.
Becomes second global company to cease operations this week on the peninsula annexed by Russia.
The company was fined more than $250,000 by a New Zealand court for the way it handled food safety scare.
Company decided not to change ignition switch eventually linked to the deaths of 13 people.
Cites government production regulations that restrict its export opportunities as reason for move.
Retailer files suit alleging Visa worked with large banks to fix the price of credit card transaction fees.
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