In a written statement, the California Democrat said the aid was needed "in order to prevent the failure of one or more of the major American automobile manufacturers, which would have a devastating impact on our economy, particularly on the men and women who work in that industry."
"Congress and the Bush administration must take immediate action," she added.
The plight of the industry has drawn attention from the White House and the incoming Obama administration in recent days, as well as among lawmakers.
Last week, President-elect Obama prodded the Bush administration to do more to help the industry, and on Monday, he raised the issue with President Bush in an Oval Office conversation meant to underscore a smooth transition of power.
Officials familiar with the conversation said the president replied he was open to the idea.