The board of directors of General Motors Corp is asking for an investigation into newly revealed accounting errors which have delayed the filing of its annual report. The SEC filing of its 10-K will be delayed because of accounting errors found in the residential mortgage business of GM’s finance arm, General Motors Acceptance Corp. In addition, other accounting mistakes have been found, and these will cause the company to restate earnings from 2000 to 2005.

GM will be increasing its 2005 loss to $10.6 billion, or $18.69 a share. The previous loss reported was $8.6 billion, or $15.13 a share. The additional losses relate to $400 million in charges for North American restructuring.

The restatement of earnings for 2000 through 2004 is related to incorrect reporting of payments and credits received from suppliers.