DETROIT — General Motors is recalling more than 1.5 million vehicles, including SUVs, vans and Cadillacs, for defective air bags and other problems.

The new recalls come as GM faces investigations over its handling of a recall of more than 1.6 million small cars for defective ignition switches. The new recalls aren’t related to that issue, but the company did say they’re part of a broad product safety review prompted by the ignition switch problem, which is linked to 12 deaths.

GM expects to spend about $300 million in the first quarter to repair the vehicles in the new recalls as well as the vehicles in the small car recall. GM said last month that ignition switches in older Chevrolet Cobalts, Pontiac G5s, Saturn Ions, Chevrolet HHRs, the Pontiac Solstice and the Saturn Sky need to be repaired.

The new recalls are:

n 1.18 million SUVs because their side air bags, front center air bags and seat belt pretensioners might not deploy if drivers ignore an air bag warning light. The recall includes the Buick Enclave and GMC Acadia from the 2008-2013 model years; the Chevrolet Traverse from 2009-2013; and the Saturn Outlook from 2008-2010. GM says no injuries are related to the defect.

n 303,000 Chevrolet Express and GMC Savana vans from 2009-2014 because material on the instrument panel might not adequately protect unbelted passengers’ in a crash. No injuries were reported.

n 63,900 Cadillac XTS sedans from the 2013 and 2014 because a plug in the brake assembly can get dislodged and short, increasing the risk of an engine compartment fire. GM says it knows of two fires in unsold Cadillacs at dealerships and two cases in which components melted. But it has had no reports of injuries.