General Motors has decided that a defect, which relates to motor vehicle safety exists in certain 2021 model year Chevrolet Express and GMC Savanna vehicles equipped with 6.6L gas engines. In certain circumstances, anti-rotation tabs on the positive battery cable terminals may come into contact with a fuse block assembly attachment post, causing a short circuit. Clearance between the positive battery cable anti-rotation tab and the fuse attachment posts is small enough to allow contact in certain situations.