A number of plaintiffs attorneys, hoping to jumpstart lawsuits over General Motors Co.’s ignition switch recalls, are challenging a court order that prevents them from pursuing their claims.

U.S. Bankruptcy Judge Robert Gerber has temporarily halted proceedings in consumer lawsuits filed over GM’s ignition-switch defect, which prompted recalls of 2.6 million vehicles this year. Plaintiffs lawyers in three cases, hoping to escape Gerber’s stay order, assert that their claims aren’t subject to decisions in GM’s bankruptcy. So far, their challenges have been unsuccessful.