DETROIT — General Motors issued a new recall of 1.5 million vehicles Monday, part of an effort to assure buyers that it’s moving faster to fix safety defects in its cars and trucks.

In a video message to employees posted Monday, CEO Mary Barra said the new recall resulted from a push to review potential safety issues and resolve them more quickly.

It’s part of the fallout from the recall last month of more than 1.6 million small cars for defective engine switches. The defect is linked to 12 deaths, and GM is facing multiple investigations into how it handled the recall. GM first began investigating the switches in 2004.