Rep. Joe Sestak, D-Pa., called for “immediate action” to address the problem in a statement Sunday, after writing a letter to President Obama Saturday expressing his concerns.

In the letter, Sestak said only 2 percent of claims have been paid and that four of every five applications have been “rejected for minor oversight.”…

Staffing could be one problem. According to sales data summarized by Transportation Department officials, dealers have submitted requests for rebates on 338,659 vehicles sold.

But while Congress just expanded the $1 billion program by $2 billion, the Department of Transportation says a staff of just 225 people is reviewing those claims.