General Motors Co. unveiled its plan to compensate victims of its ignition-switch defect on Monday, but plaintiffs lawyers complained that the program leaves out a large number of their clients, many of whom will pursue their cases in court.

The uncapped fund, announced by claims attorney Kenneth Feinberg, would pay millions of dollars to families of people killed in accidents caused by the defects, which forced GM to recall 2.6 million cars. It also would pay those who were seriously or moderately injured.