Incident: Tesla Model S Power Steering Bolt Corrosion Recall Incident

Published Date: 2018-03-30

Postmortem Analysis
Timeline 1. The software failure incident of the power steering bolts in Tesla Model S sedans happened before the article was published on March 30, 2018 [68913]. Therefore, the software failure incident with the power steering bolts in Tesla Model S sedans likely occurred before March 2018.
System 1. Power steering bolts in Tesla Model S sedans built before April 2016 [68913]
Responsible Organization unknown
Impacted Organization 1. Tesla Model S owners [68913]
Software Causes unknown
Non-software Causes 1. Corrosion of power steering bolts due to exposure to harsh winter road conditions [68913].
Impacts 1. The software failure incident in Tesla Model S power steering bolts led to a recall of all early Model S sedans built before April 2016, affecting approximately 123,000 vehicles globally [68913]. 2. The recall presented a tripping hazard for Tesla, which was already facing production challenges with its Model 3 sedan and scrutiny from investors and the public [68913]. 3. The National Transportation Safety Board launched an investigation into a deadly Model X crash to determine if the car was in Autopilot mode and how the self-driving feature could have contributed to the driver's death [68913].
Preventions 1. Regular maintenance and inspection of the power steering system to detect corrosion and weakening of bolts before they lead to failure could have prevented the incident [68913].
Fixes 1. The software failure incident in the Tesla Model S power steering system due to corroding bolts could be fixed by replacing all early Model S power steering bolts in all climates worldwide [68913].
References 1. Email sent to tens of thousands of Tesla Model S owners warning about power steering failure [68913] 2. Tesla's official statement regarding the power steering bolt corrosion issue [68913] 3. Tesla's recall of all early Model S power steering bolts globally [68913] 4. Tesla's estimation of the percentage of vehicles in the US that may suffer the power steering failure [68913] 5. National Transportation Safety Board's investigation into a deadly Model X crash in California [68913] 6. Comparison of Tesla's recall with recalls from other manufacturers like Mercedes-Benz, Honda, Ford, Ferrari, Pagani, and Maserati [68913] 7. Mention of Tesla's previous recalls and issues with production delays and crashes [68913] 8. Information on the ease of fixing the power steering bolt issue [68913] 9. Challenges faced by Tesla in terms of build quality issues with new Model 3 vehicles [68913] 10. Overall impact of the steering recall on Tesla's reputation, share prices, and investor confidence [68913]

Software Taxonomy of Faults

Category Option Rationale
Recurring multiple_organization (a) In the provided articles, there is no specific mention of a software failure incident happening again within the same organization (Tesla) or with its products and services. (b) The articles do mention other organizations facing recalls and issues with their products: - Mercedes-Benz is recalling 121,000 GLC SUVs due to a design flaw in the rear seat belts. - Honda is recalling 254,000 Odyssey minivans because of back seats that might not latch properly. - Ford, Ferrari, Pagani, and Maserati are also bringing in smaller numbers of cars for repairs [68913].
Phase (Design/Operation) design, operation (a) The software failure incident related to the design phase can be seen in the article where it mentions that Tesla Model S owners received an email warning about power steering bolts corroding and weakening, particularly in cold climates with specific road salts. This issue was identified in early Model S sedans built before April 2016, affecting some 123,000 vehicles globally. Tesla plans to replace all early Model S power steering bolts to address the possibility of corrosion-related failures [68913]. (b) The software failure incident related to the operation phase can be inferred from the article where it discusses the National Transportation Safety Board launching an investigation into a deadly Model X crash in the California Bay Area. The investigation aims to determine if the car was in Autopilot mode when it crashed into a freeway safety barrier, leading to the driver's death. This incident raises questions about how the self-driving feature could have contributed to the fatal outcome, indicating a potential failure in the operation or use of the system [68913].
Boundary (Internal/External) within_system (a) within_system: The software failure incident related to the power steering bolts corrosion affecting Tesla Model S sedans built before April 2016 is a within_system failure. The failure originated from within the system itself, specifically from the corroding bolts that hold the power steering system together [68913].
Nature (Human/Non-human) non-human_actions (a) The software failure incident in the article is not related to non-human actions. It is primarily caused by bolts corroding and weakening in the power steering system of Tesla Model S cars, particularly in cold climates exposed to harsh winter road conditions [68913]. (b) The software failure incident in the article is not directly related to human actions. However, it is mentioned that Tesla is voluntarily recalling all affected vehicles to stay on the safe side, indicating a proactive response to the issue [68913].
Dimension (Hardware/Software) hardware (a) The software failure incident occurring due to hardware: - The article mentions a software failure incident related to the power steering bolts in Tesla Model S cars. The failure was attributed to corroding and weakening bolts that hold the system together, particularly when exposed to harsh winter road conditions [Article 68913]. (b) The software failure incident occurring due to software: - The article does not mention any software failure incident specifically attributed to contributing factors originating in software.
Objective (Malicious/Non-malicious) non-malicious (a) The article does not mention any malicious software failure incident related to the Tesla Model S power steering bolt corrosion issue. (b) The software failure incident related to the Tesla Model S power steering bolt corrosion issue is non-malicious. The failure was due to the bolts corroding and weakening, particularly in cold climates exposed to certain road salts, leading to a potential power steering failure in the vehicles [68913].
Intent (Poor/Accidental Decisions) unknown The articles do not provide information about a software failure incident related to poor_decisions or accidental_decisions.
Capability (Incompetence/Accidental) unknown (a) The software failure incident related to development incompetence is not mentioned in the provided article. (b) The software failure incident related to accidental factors is not mentioned in the provided article.
Duration unknown The articles do not mention any software failure incident related to either a permanent or temporary duration.
Behaviour crash (a) crash: The article mentions a software-related incident where Tesla Model S cars might experience a power steering failure due to corroding and weakening bolts [68913]. (b) omission: There is no specific mention of a software failure incident related to omission in the provided article. (c) timing: The article does not provide information about a software failure incident related to timing issues. (d) value: The article does not mention a software failure incident related to the system performing its intended functions incorrectly. (e) byzantine: The article does not discuss a software failure incident related to inconsistent responses or interactions. (f) other: The behavior of the software failure incident in this case is related to a potential crash of the power steering system in Tesla Model S cars due to corroding and weakening bolts [68913].

IoT System Layer

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

Other Details

Category Option Rationale
Consequence death, harm, property, theoretical_consequence (a) death: The National Transportation Safety Board launched an investigation into a deadly Model X crash in the California Bay Area to determine if the car was in Autopilot mode when it hit a freeway safety barrier, caught fire, and led to the driver's death [68913].
Domain transportation, manufacturing (a) The failed system in the incident was related to the transportation industry, specifically affecting Tesla Model S electric cars. The power steering bolts in the vehicles were found to be corroding and weakening, leading to a recall of some 123,000 vehicles globally [Article 68913].

Sources

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