The investigation covers about 400,000 vehicles, including Pathfinders from the 1996-2004 model years and QX4s from the 1997-2003 model years.
The National Highway Traffic Safety Administration said in a posting on its website Tuesday that it had received 35 reports of corrosion leading to a failure of the driver's side front strut tower, which affects the vehicle's alignment. A failure of the strut tower could affect the steering column and make it more difficult to control the vehicle.
The government received 5 reports of the steering shaft breaking, leading to a loss of steering.
There have been no reports of crashes or injuries.
Nissan said in a statement it was "committed to customer safety and the quick, effective resolution of safety issues and will work closely with NHTSA to investigate this issue."