General Motors Corp. is crying foul over a request by former subsidiary Delphi Corp. to use the bankruptcy court to void supply contracts with the automaker.

In March, the bankrupt Troy, Mich.-based auto parts maker filed a request with the U.S. Bankruptcy Court for the Southern District of New York to terminate about 5,000 supply contracts that it deemed unprofitable. In its objection, filed Monday, General Motors complained that Delphi was using the bankruptcy court “as a coercive hold-up device” against the Detroit-based automaking giant.