Steering sticks, feels notchy or jerks

The Office of Defects Investigation (ODI) is opening this Preliminary Evaluation to assess the scope, frequency, and potential safety consequences of alleged defects related to the electric power steering (EPS) system in model year (MY) 2017–2018 Chrysler Pacifica vehicles. ODI has received 94 Vehicle Owner Questionnaires (VOQs) reporting a condition in which the steering system exhibits a sticking sensation during gradual turns, particularly when the steering wheel is positioned near the 11 o'clock or 1 o'clock position. Complainants allege that during these events, increased steering effort is required to return the wheel to center. In many cases, this is followed by a sudden reactivation of EPS assistance, which may result in an oversteer condition. This behavior could increase the risk of a crash, especially at higher speeds. ODI has identified multiple VOQs describing similar symptoms. This investigation will assess the frequency, root cause, and potential safety-related consequences of the alleged EPS malfunction. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

COMPLAINANTS ALLEGE THAT A FIRE ERUPTED UNDER THE HOOD, NEAR THE FRONT OF THE VEHICLE.IN CHRYSLER'S RESPONSE TO ODI'S NOVEMBER 2, 2007 INFORMATION REQUEST, CHRYSLER ASSERTS THAT THE ALLEGED DEFECT OCCURS ONLY IN THE 4.0L ENGINES AND THE CONSUMER WILL EXPERIENCE A LOSS OF POWER STEERING FLUID OR A NOISY POWER STEERING PUMP BEFORE SEEING ANY EVIDENCE OF SMOKE OR FIRE.CHRYSLER ALSO STATES THAT A TUBE NUT ON THE HIGH PRESSURE POWER STEERING LINE WAS DISCOVERED TO BE CROSS THREADED DURING THE ASSEMBLY PROCESS AND DID NOT ALLOW PROPER SEALING OF THE O-RING.THE POWER STEERING SYSTEM IN THE 4.0L ENGINE IS ASSEMBLED AT THE CHRYSLER PLANT.THE POWER STEERING SYSTEM FOR THE 3.8L ENGINES ARRIVES AT THE CHRYSLER PLANT PRE-ASSEMBLED.CHRYSLER FOUND THAT IN THE 4.0L ENGINE, IT WAS POSSIBLE TO CROSS-THREAD THE TUBE NUT ON THE HIGH PRESSURE LINE DURING ITS ATTACHMENT TO THE STEERING GEAR, THUS CREATING AN IMPROPER SEAL.CHRYSLER IMPLEMENTED ASSEMBLY PLANT PROCESS CHANGES TO ELIMINATE THE POSSIBILITY OF CROSS-THREADING, AND APPLIED ADDITIONAL QUALITY CONTROL MEASURES TO DETECT POWER STEERING FLUID LEAKS.CHRYSLER STATED THAT WARRANTY AND FIELD DATA SUGGESTS THAT THESE PROCESS CHANGES HAVE MINIMIZED THE POSSIBILITY OF CROSS-THREADING.WITH REGARD TO THE VEHICLES PRODUCED PRIOR TO THE PRODUCTION CHANGE, A REVIEW OF THE WARRANTY CLAIMS INDICATES THAT THE ALLEGED DEFECT HAS NOT DECLINED IN THE 4.0L POPULATION.ODI IS UPGRADING THIS PRELIMINARY EVALUATION TO AN ENGINEERING ANALYSIS, EA08-006, TO FURTHER