GM Again Accused of Hiding Transmission Defects Since 2014

General Motors LLC was hit with a new proposed class action alleging it concealed two transmission defects that caused shuddering and poor shift quality in 18 Chevrolet and GMC models.

The complaint filed Wednesday in the US District Court for the Eastern District of Michigan alleges GM knew about the defects in 2014, but actively concealed information about them so customers wouldn’t learn about the problems until their warranty periods elapsed.

The plaintiffs say their suit involves states and claims that aren’t covered by another class action alleging defects over the same transmissions. Drivers in that lawsuit, Speerly v. General ...