Frame weld deficiencies
PE19012
Closed preliminary evaluation · opened September 16, 2019 · closed October 29, 2023
the steering, the body structure
On September 16, 2019, the Office of Defects Investigation (ODI) granted Defect Petition DP18-004 and opened Preliminary Evaluation PE19-012 to investigate allegations of deficient frame welds and their potential safety related effects on 2018-2019 Jeep Wranglers. Due to a previous steering related recall that was caused by a misaligned weld on the front track bar (NHTSA Recall No. 18V-675), ODI decided to include reports of steering shimmy or wobble, loose steering, and steering stiction (loss of power steering) as part of this investigation and parent petition (DP18-004). ODI received information from the vehicle manufacturer Fiat Chrysler Automobiles (FCA) via information request letters dated March 8, 2019, and February 6, 2020. Supplemental requests for information occurred between July 2020 and July 2023. A review of the responsive manufacturer information showed that vehicles presenting an unexpected reduction in steering ability due to a welding tool misalignment were correctly addressed via recall 18V-675. General complaints concerning the weld appearance were not associated with a realized risk to motor vehicle safety. ODI identified a limited number of reports involving weld separation on vehicles that were out of scope of recall 18V-675. FCA identified various causes of weld quality issues in early production (build dates prior to March 2018) including improper welding techniques on galvanized frames and component part variation leading to off-seam welds. These issues were addressed in production for subject vehicles built after July 2018 and preceded a drop in weld failure reports. ODI reviewed manufacturer and agency reports of weld failures out of scope of recall 18V-675 and did not find any that resulted in a loss of vehicle control. There are no known crashes, injuries, or fatalities as a result of weld failures on vehicles not included in recall 18V-675. Due to the steering related consequence associated with Recall 18V-675, ODI opted to include a request for information regarding various steering issues experienced by vehicles included in this investigation. ODI reviewed manufacturer as well as agency data and determined these various steering issues were not related to any weld defect. Since the opening of this investigation, FCA has addressed the following steering concerns; a. Steering looseness due to material choice in the steering box internal components. FCA released an updated part with an internal component material less sensitive to temperature variances (TSB 08-003-21 REV. A).NHTSA will take further investigative action if justified. b. Steering wobble or shimmy due to a manufacturing and design deficiency in the steering damper. FCA released a part via Customer Satisfaction Notification (CSN) V41 in June 2019 which implemented supplier quality control improvements and design changes due to the presence of air in the base valve which degraded damping performance.NHTSA will take further investigative action if justified. c. Steering stiction, or loss of power steering, due to an underpowered steering pump calibration that occurred at highway speeds during cold weather. In December 2021, FCA released CSN Y95 which corrected this issue via software update. Due to the decreased number of consumer complaints, the service campaign appears to have addressed the issue related to an underpowered steering pump. NHTSA will take further investigative action if justified. The closing of this investigation does not constitute a finding by NHTSA that a safety-related defect does not exist. The Agency reserves the right to take additional action if warranted by future circumstances. To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to NHTSA.gov.
Frame Weld Deficiencies
DP18004
Closed defect petition · opened November 16, 2018 · closed September 17, 2019
the steering, the body structure
In a letter received on October 24, 2018, a citizen petitioned the National Highway Traffic Safety Administration (NHTSA) to initiate a safety defect investigation into frame weld deficiencies on model year (MY) 2018 'JL' Jeep Wrangler vehicles. The petitioner described a broad list of frame weld deficiencies, including porous welds, excessive slag, lack of weld penetration, over penetration of welds, overweld or weld drip, and weld splash. The weld defects are allegedly located at a variety of locations on the frame assembly.On November 16, 2018, the Office of Defects Investigation (ODI) opened a Defect Petition (DP18-004) to evaluate whether to grant or deny the petition. On March 8, 2019, ODI sent an Information Request letter to Fiat Chrysler Automobiles (FCA) requesting information on frame weld related issues on all MY 2018-2019 Jeep Wrangler 'JL' vehicles. Due to a previous steering related recall that was caused by a misaligned weld on the front track bar (NHTSA Recall No. 18V-675), ODI opted to include a request for additional information concerning reports of steering shimmy or wobble, loose steering, and steering lockup in the March request letter. ODI has performed a preliminary analysis on the information obtained from FCA. Based on ODI's review of the applicable materials, NHTSA has decided to grant the petition. While reviewing the applicable materials obtained from the manufacturer, ODI identified various reports and references to frame welded component detachments that were outside of the scope of NHTSA Recall No. 18V-675. Additionally, the information that FCA provided did not adequately address whether frame weld quality deficiencies compromise the structural integrity of vehicles, and therefore may pose an unreasonable risk to motor vehicle safety. Finally, ODI needs to further evaluate the alleged steering-related defects reported through MY 2019 and the alleged defects' relation to weld quality.The petition was granted on September 16, 2019. Preliminary Evaluation PE19-012 has been opened to further assess the scope, frequency, and potential safety-related consequences of alleged weld quality deficiencies and steering related concerns on the MY 2018-2019 'JL' Jeep Wrangler vehicles.The ODI reports cited above can be viewed on NHTSA.gov under the following reference numbers:11234967, 11222390, 11219370, 11217080, 1204905, 11179954, 11171786, 11161243, 11155523, 11153044, 11143617, 11142722, 11142426, 11141336, 11141035, 11140637, 11140344, 11140262, 11140085, 11140057, 11139880, 11139866, 11139557, 11139467, 11139436, 11138974, 11138758, 11138757, 11132030, 11129738, 11129667, 11124312, 11120232, 11119676, 11119650, 11119454, 11119450, 11115658, 11115137, 11113029, 11112515, 11110583, 11109903, 11093172, 11088501, 11076098