Updated from 8:48 a.m. ESTGeneral Motors ( GM) said recurring losses and its inability to generate sufficient cash flow to meet obligations caused its auditor to raise "substantial doubt" about the automaker's ability to continue as a going concern. The disclosure, included in the company's 10-K filing with the Securities and Exchange Commission on Thursday, said GM's "recurring losses from operations, stockholders' deficit, and inability to generate sufficient cash flow to meet our obligations and sustain our operations raise substantial doubt about our ability to continue as a going concern." Shares of GM were trading at $1.82 Thursday afternoon, down 38 cents or 17.27%. Earlier this week, the struggling automaker said vehicle sales slid nearly 53% in February, as it saw hefty, double-digit declines across all major units. "There is no assurance that the global automobile market will recover or that it will not suffer a significant further downturn," the company said in the filing. GM has received $13.4 billion in federal loans as it tries to survive the worst auto-sales climate in decades. It is seeking a total of $30 billion from the government. During the past three years it has piled up $82 billion in losses, including $30.9 billion in 2008. Shares of GM closed at $2.20 Wednesday. A premarket quote indicated the stock could open around $1.80. In its filing, GM said its future depends on successfully executing the viability plan submitted to the government in February to justify the loans. "If we fail to do so for any reason, we would not be able to continue as a going concern and could potentially be forced to seek relief through a filing under the U.S. Bankruptcy Code," GM said in the annual report.