Incident: Incorrect Inspection Leads to Power Steering Issue Recall for Chevrolet SS Sedans

Published Date: 2019-11-27

Postmortem Analysis
Timeline 1. The software failure incident happened in 2017. [Article 92800] Explanation: Step 1: The article mentions that the original recall took place in 2017. Step 2: The article was published on 2019-11-27. Step 3: Based on the information provided, the software failure incident occurred in 2017.
System 1. Steering assembly gear in Chevrolet SS sedans from the 2014-2016 model years [92800]
Responsible Organization 1. General Motors (GM) - GM was responsible for causing the software failure incident related to the power steering issues in Chevrolet SS sedans. The incorrect inspection process during the original recall and the subsequent follow-up investigation led to the identification of missed inspections and the need for new terminals in the steering assembly [92800].
Impacted Organization 1. Chevrolet SS owners [92800]
Software Causes 1. Incorrect inspection process led to missing out on identifying a few hundred SS models requiring a new terminal in the steering assembly [92800].
Non-software Causes 1. Incorrect inspection process during the original recall in 2017, which led to some affected models not being properly inspected [92800]. 2. Omission of a few hundred SS models during the inspection process, resulting in the need for a follow-up recall [92800]. 3. Presence of an incorrect terminal in the steering assembly gear of the affected Chevy SS sedans [92800]. 4. Corrosion of the connector in the steering assembly gear, leading to a sudden loss of power steering [92800].
Impacts 1. The software failure incident led to a situation where a group of Chevrolet SS sedans were incorrectly inspected during the original recall in 2017, resulting in some cars not receiving the necessary replacement of the steering assembly gear if an incorrect terminal was present [92800]. 2. As a consequence of the incorrect inspection process, another 476 SS sedans were identified this year as needing a new terminal in the steering assembly, even though they had been previously inspected and deemed okay [92800]. 3. The failure to provide the correct gold-plated connector in the affected vehicles could lead to connector corrosion, potentially causing a sudden loss of power steering while driving, increasing the risk of a crash [92800].
Preventions 1. Implementing a more thorough inspection process during the original recall in 2017 could have prevented the software failure incident by ensuring all affected models were properly checked for the correct terminal in the steering assembly gear [92800]. 2. Conducting a comprehensive follow-up investigation immediately after the initial recall could have helped identify any missed inspections and potential issues, preventing the need for a subsequent recall [92800].
Fixes 1. The software failure incident in the Chevrolet SS sedans can be fixed by replacing the steering assembly gear with the correct terminal to prevent the risk of sudden loss of power steering [92800].
References 1. General Motors (GM) [92800] 2. National Highway Traffic and Safety Administration [92800]

Software Taxonomy of Faults

Category Option Rationale
Recurring unknown The article does not mention any software failure incident related to either one_organization or multiple_organization. Therefore, the information about the software failure incident happening again at a specific organization or across multiple organizations is unknown based on the provided article.
Phase (Design/Operation) design, unknown (a) The software failure incident related to the design phase can be inferred from the article. The article mentions that General Motors issued a follow-up recall due to incorrect inspection that occurred for a group of Chevy SS sedans. The original recall in 2017 instructed dealers to inspect affected models and replace steering assembly gear if an incorrect terminal was present. However, a follow-up investigation in 2019 revealed that the inspection process left out a few hundred SS models, leading to the need for another 476 sedans to go back to the dealer for a new terminal in the steering assembly. This failure can be attributed to a design flaw in the inspection process that initially missed identifying the incorrect terminals, leading to the need for a subsequent recall [92800]. (b) The software failure incident related to the operation phase is not explicitly mentioned in the article. Therefore, it is unknown if the failure was due to contributing factors introduced by the operation or misuse of the system.
Boundary (Internal/External) within_system The software failure incident reported in Article 92800 is related to a recall issued by General Motors for Chevrolet SS sedans due to power steering issues. The failure falls under the within_system boundary as it was caused by an incorrect inspection process conducted internally by GM. The article mentions that the original recall in 2017 instructed dealers to inspect affected models and replace steering assembly gear if an incorrect terminal was present. However, a follow-up investigation revealed that the inspection process had left out a few hundred SS models, leading to the need for another recall. This internal oversight resulted in the failure to identify the need for a new terminal in the steering assembly, which could lead to a sudden loss of power steering [92800].
Nature (Human/Non-human) human_actions (a) The software failure incident in this case is not related to non-human actions but rather to a human error in the inspection process. The failure occurred because an incorrect inspection was conducted for a group of Chevy SS sedans, leading to the omission of a few hundred models from the recall population that required a new terminal in the steering assembly [92800]. This human error resulted in the potential risk of a sudden loss of power steering for affected vehicles. (b) The software failure incident can be attributed to human actions in this case. The failure occurred due to an incorrect inspection process carried out by individuals involved in the recall procedure for the Chevy SS sedans. The human error of omitting certain vehicles from the recall population led to the need for a follow-up recall to address the issue of a corroding connector in the steering assembly, which could result in a sudden loss of power steering for drivers [92800].
Dimension (Hardware/Software) hardware (a) The software failure incident in this case is related to hardware. The article mentions that General Motors issued a recall for Chevrolet SS sedans due to power steering issues caused by an incorrect terminal in the steering assembly gear. The incorrect inspection of the steering assembly gear led to the need for a new terminal to prevent a sudden loss of power steering, which could increase the risk of a crash. This issue originated from a hardware component (the steering assembly gear) rather than software. [92800]
Objective (Malicious/Non-malicious) non-malicious (a) The software failure incident in this case is non-malicious. The failure was related to a recall issued by General Motors for Chevrolet SS sedans due to power steering issues caused by an incorrect terminal in the steering assembly gear. The failure was a result of incorrect inspection during the original recall process, leading to a few hundred SS models being left out and requiring a new terminal in the steering assembly [92800].
Intent (Poor/Accidental Decisions) accidental_decisions The software failure incident described in the article does not directly relate to poor decisions or accidental decisions. The failure is attributed to an incorrect inspection process that led to a group of Chevrolet SS sedans not receiving the necessary replacement of the steering assembly gear terminal, which could result in a sudden loss of power steering [Article 92800].
Capability (Incompetence/Accidental) unknown The article does not mention any software failure incident related to development incompetence or accidental factors. Therefore, the information to answer this question is 'unknown'.
Duration unknown The article does not mention any software failure incident related to the Chevrolet SS steering assembly recall. Therefore, the duration of the software failure incident in this case is unknown.
Behaviour omission, other (a) crash: The software failure incident described in the article is not related to a crash where the system loses state and does not perform any of its intended functions. (b) omission: The failure is related to an omission where the system omitted to perform its intended functions at an instance(s). The article mentions that during the original recall in 2017, an incorrect inspection occurred for a group of Chevy SS sedans, leading to a few hundred models being left out of the inspection process. These cars had already been inspected and given the OK, but they actually required a new terminal in the steering assembly, which was omitted initially [92800]. (c) timing: The failure is not related to timing where the system performs its intended functions correctly but too late or too early. (d) value: The failure is not related to the system performing its intended functions incorrectly. (e) byzantine: The failure is not related to the system behaving erroneously with inconsistent responses and interactions. (f) other: The behavior of the software failure incident in this case is an omission where certain vehicles were omitted from the inspection process during the original recall, leading to the need for a follow-up recall to address the issue [92800].

IoT System Layer

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

Other Details

Category Option Rationale
Consequence theoretical_consequence The articles do not mention any consequences related to death, harm, basic needs, property loss, or delays caused by the software failure incident. The recall was related to a power steering issue in Chevrolet SS sedans, specifically concerning the steering assembly gear. The potential consequence discussed was the risk of a sudden loss of power steering, which could increase the risk of a crash [92800].
Domain transportation, manufacturing (a) The failed system in the article is related to the automotive industry, specifically affecting Chevrolet SS sedans manufactured by General Motors [92800].

Sources

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