Incident: Wiring Harness Sealer Issue Causes Power Steering Loss in Chrysler.

Published Date: 2019-05-20

Postmortem Analysis
Timeline 1. The software failure incident involving the wiring harness causing intermittent power steering loss in Chrysler Pacifica minivans occurred between January and early May [84621]. 2. Published on: 2019-05-20 3. Estimated Timeline of the Incident: January to May 2019
System The software failure incident mentioned in the article did not involve a software system failure. Instead, it was related to a hardware issue with the wiring harness in certain Chrysler Pacifica minivans, causing intermittent power steering loss and motive force issues due to a loose battery ground joint [84621].
Responsible Organization 1. The software failure incident in the Chrysler Pacifica minivan was caused by a specific sealer used during the manufacturing process, which led to a loose battery ground joint resulting in intermittent power steering loss and motive force issues [84621].
Impacted Organization 1. Owners of 2017-2019 Chrysler Pacifica minivans [84621]
Software Causes 1. The software cause of the failure incident was related to a specific sealer used during the manufacturing process of the wiring harness, which might cause a loose battery ground joint, leading to intermittent power steering loss and motive force issues [84621].
Non-software Causes 1. The failure incident was caused by a wiring harness issue due to a specific sealer used during the manufacturing process, leading to a loose battery ground joint [84621].
Impacts 1. The software failure incident led to intermittent power steering loss in affected Chrysler Pacifica minivans, increasing the risk of a crash [84621].
Preventions 1. Implementing more rigorous quality control measures during the manufacturing process to ensure that the sealer used in the wiring harness assembly does not lead to loose battery ground joints [84621]. 2. Conducting more extensive testing and field studies to detect potential issues like intermittent power steering loss earlier on, before they impact a larger number of vehicles [84621].
Fixes 1. Technicians will inspect the surfaces in question and, if necessary, clean and reassemble the battery ground joint to prevent intermittent connection loss [84621].
References 1. Field-study information from 14 vehicles reporting intermittent power steering loss [84621]

Software Taxonomy of Faults

Category Option Rationale
Recurring unknown The article does not mention any software failure incident happening again at the same organization (Chrysler) or at multiple organizations. Therefore, the information related to the software failure incident recurrence is unknown.
Phase (Design/Operation) design (a) The software failure incident in this case was primarily due to a design issue related to the wiring harness. The problem stemmed from a specific sealer used during the manufacturing process, which caused a loose battery ground joint. This design flaw led to intermittent power steering loss or loss of motive force in the affected vehicles [84621]. (b) There is no specific information in the provided article indicating that the software failure incident was due to factors introduced by the operation or misuse of the system.
Boundary (Internal/External) within_system The software failure incident described in the article is related to a wiring harness issue in Chrysler vehicles, specifically the 2017-2019 Chrysler Pacifica minivan. The problem was caused by a specific sealer used during the manufacturing process, which led to a loose battery ground joint. This issue falls under the category of within_system failure as it originated from the manufacturing process and components used internally in the vehicles [84621].
Nature (Human/Non-human) non-human_actions (a) The software failure incident in this case is not related to non-human actions but rather to a manufacturing issue with the wiring harness and a specific sealer used during the process. The problem with the loose battery ground joint causing intermittent power steering loss was identified as a result of the manufacturing process and the sealer used, indicating a failure due to contributing factors introduced without human participation [84621]. (b) The failure was not due to contributing factors introduced by human actions but rather a result of the manufacturing process and the specific sealer used during that process. The issue was discovered by Chrysler after receiving field-study information from vehicles reporting the problem, leading to the identification of the sealer as the cause of the intermittent power steering loss. The automaker then decided to initiate a voluntary recall to address the issue, indicating a failure not caused by human actions [84621].
Dimension (Hardware/Software) hardware (a) The software failure incident in this case is related to hardware. The issue stemmed from a specific sealer used during the manufacturing process of the wiring harness, which caused a loose battery ground joint. This loose connection led to intermittent power steering loss or loss of motive force in the affected vehicles [84621]. The problem was identified as originating from the hardware component (wiring harness and battery ground joint) rather than software.
Objective (Malicious/Non-malicious) non-malicious The software failure incident described in the article does not involve any malicious intent. Instead, it is a non-malicious failure related to a manufacturing issue with the wiring harness in Chrysler vehicles. The problem was identified as a loose battery ground joint caused by a specific sealer used during the manufacturing process, leading to intermittent power steering loss or loss of motive force in the affected vehicles [84621].
Intent (Poor/Accidental Decisions) unknown The software failure incident described in Article 84621 does not directly relate to poor or accidental decisions. Instead, it is attributed to a specific sealer used during the manufacturing process causing a loose battery ground joint, leading to intermittent power steering loss in vehicles.
Capability (Incompetence/Accidental) unknown The article does not mention any software failure incident related to development incompetence or accidental factors. Therefore, the information related to these specific types of software failures is unknown in this context.
Duration temporary The software failure incident described in the article is temporary. The issue with the wiring harness causing intermittent power steering loss or motive force loss in the Chrysler Pacifica minivans is not a permanent failure but rather a temporary one that occurs intermittently due to the loose battery ground joint caused by the specific sealer used during the manufacturing process [84621].
Behaviour crash, other (a) crash: The article mentions that due to the wiring harness issue, the affected vehicles might occasionally lose power steering or motive force, which can increase the risk of a crash [84621]. (b) omission: The software failure incident described in the article does not specifically mention any instances where the system omitted to perform its intended functions at an instance(s). (c) timing: The article does not indicate any timing-related failures where the system performed its intended functions too late or too early. (d) value: The software failure incident in the article does not involve the system performing its intended functions incorrectly. (e) byzantine: The article does not describe any byzantine behavior where the system behaves erroneously with inconsistent responses and interactions. (f) other: The behavior of the software failure incident in the article can be categorized as a potential safety issue where the system intermittently loses power steering or motive force due to a loose battery ground joint caused by a specific sealer used during the manufacturing process. This behavior can be considered a safety hazard rather than a typical software failure [84621].

IoT System Layer

Layer Option Rationale
Perception None None
Communication None None
Application None None

Other Details

Category Option Rationale
Consequence harm, theoretical_consequence The consequence of the software failure incident described in the article is related to potential harm to individuals due to the intermittent loss of power steering or motive force in the affected vehicles. This could increase the risk of a crash, which could lead to harm or injury to the occupants of the vehicles or others on the road [84621].
Domain transportation, manufacturing (a) The failed system in the article is related to the transportation industry as it involves a recall of vehicles manufactured by Fiat Chrysler, specifically the Chrysler Pacifica minivan [84621].

Sources

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