NHTSA Engineering Analysis EA19002

On July 29, 2019, the Office of Defects Investigation (ODI) opened EA19002 to investigate instances of alleged rear lower control arm failures in 2013-2018 Nissan Altima and 2016-2018 Nissan Maxima vehicles. At the time the investigation was opened ODI had 91 consumer complaints alleging rear lower control arm failures in the subject vehicles.ODI was concerned about these complaints because many of them alleged an increased steering effort or loss of vehicle control.At the time these complaints were received, ODI was also aware of a proactive service campaign addressing 2013 Nissan Altima in salt-belt states for a similar concern. Since opening the investigation, ODI has confirmed, based on consumer complaints, warranty data, and testing conducted by Nissan and ODI, that owners of the subject vehicles are experiencing a corroded bushing at one of three mounting points of the control arm to the rear subframe.ODI has also confirmed that drivers become aware of the problem because of sound and abnormal vibrations. In addition, the failure mileage is typically over 113,000 miles at the time of failure.In conjunction with Nissan and VRTC, ODI participated in testing to assess the potential safety consequence of a bushing failure.It was found the Vehicle Dynamic Control system allows the driver to maintain vehicle control in the event of a bushing failure.With between 7 to 13 years of field exposure, ODI is aware of only one low speed crash allegation describing minor contact with another vehicle’s trailer hitch. Nissan acknowledges that a crack can develop in affected control arms due to stress loading from normal use and that salts commonly used for roadway snow and ice treatment may result in corrosion that exacerbates the progression of the crack.Nissan implemented a design change in January of 2018 to improve the durability of the lower control arm.Affected vehicles have either been repaired with the countermeasure part under a customer satisfaction campaign or been