Title: Failure Mode and Effects Analysis (FMEA) | ISO 26262 Academy URL: https://iso26262.academy/features/concepts/fmea Description: Learn bottom-up failure mode analysis to identify single-point, residual, and latent faults in your system. --- Concept guide · ISO 26262-9 §8 · 12 chapters # FMEA Master Failure Mode and Effects Analysis using the unified AIAG/VDA 7-step approach and integrate findings into ISO 26262 hardware safety analysis. 12 Chapters 6 Interactive Tools 1 Case Study 1 Video Included in Expert [Start learning](https://iso26262.academy/register?plan=free&from=%2Fconcepts%2Ffmea&utm_source=website&utm_medium=cta&utm_campaign=features_concepts) See the chapters Inside the course 1. 01 **Introduction to FMEA** 2. 02 **FMEA Fundamentals** 3. 03 **AIAG/VDA 7-Step Process** 4. 04 **Design FMEA (DFMEA)** 5. 05 **Process FMEA (PFMEA)** The short version ## Quick answers What is FMEA in ISO 26262? Failure Mode and Effects Analysis is a systematic, bottom-up inductive method that identifies how a design or process element can fail, what effects each failure mode has, and which controls prevent or detect it. In ISO 26262, safety analyses are required by Part 9 Clause 8, and FMEA is one of the primary qualitative techniques used to satisfy them - typically as a Design FMEA feeding the Part 5 hardware safety analysis. Modern automotive practice follows the unified AIAG/VDA handbook: a 7-step process from planning and structure analysis through function and failure analysis to risk analysis, optimization, and documentation. What is the difference between RPN and Action Priority (AP)? The classic Risk Priority Number multiplies Severity, Occurrence, and Detection into a single 1-1000 figure - simple, but it treats S9/O2/D2 the same as S2/O9/D2, hiding severe risks behind low products. The AIAG/VDA handbook replaced it with Action Priority: a lookup table that maps each S/O/D combination to High, Medium, or Low priority, weighting severity so a severe-but-rare failure cannot be averaged away. AP tells you whether action is required, not just how a number ranks. The course covers both, including thresholds, action triggers, and when legacy RPN reporting is still asked for. Keep going, free - [Article · 9 min read Advanced FMEA Strategies for ISO 26262 Functional Safety](https://iso26262.academy/blog/advanced-fmea-strategies-for-iso-26262-functional-safety) - [Demo exam · no account Test yourself with 7 exam-style questions](https://iso26262.academy/demo-exam) Why this course · ISO 26262, Part 9, Clause 8 ## Why it pays for itself ### Run the 7-step process correctly Walk the unified AIAG/VDA methodology step by step - function analysis, failure nets, S/O/D rating, Action Priority - with entry and exit criteria that keep team sessions from drifting into box-ticking. ### Ratings your team can defend Calibrated Severity, Occurrence, and Detection criteria with automotive-specific examples produce consistent, auditable scores across teams - and settle the RPN-versus-AP question with clear guidance on when each applies. ### FMEA that feeds the safety case Connect failure modes to ISO 26262 Part 5 diagnostic coverage claims and Annex D assignments, so the DFMEA becomes traceable evidence in the hardware safety analysis instead of a parallel quality exercise. After the course ## What you’ll be able to do ### Conduct a Complete DFMEA Facilitate and document a full Design FMEA following the AIAG/VDA 7-step process with proper function analysis and failure nets. ### Apply Consistent Rating Criteria Rate Severity, Occurrence, and Detection with calibrated criteria to produce reliable, auditable risk priority scores. ### Identify Safety-Critical Failure Modes Systematically identify single-point failures, residual risks, and latent failure modes relevant to ISO 26262. ### Link FMEA to Diagnostic Coverage Connect failure mode analysis to ISO 26262 Part 5 diagnostic coverage assignments with traceable evidence. ### Integrate FMEA into ISO 26262 Process Position DFMEA as a formal safety analysis work product within the ISO 26262 Part 5 hardware development process. ### Manage FMEA as a Living Document Maintain the FMEA through ECOs, design changes, and production updates with version control and re-assessment records. The curriculum · 12 chapters ## Chapter by chapter 1. 01 **Introduction to FMEA** Understand what FMEA is, why it matters, and how it fits into automotive product development and ISO 26262. - History & evolution - FMEA types overview - Regulatory context 2. 02 **FMEA Fundamentals** Learn core FMEA concepts: failure modes, effects, causes, controls, and the risk priority framework. - Failure mode definition - Effect vs cause - Control types 3. 03 **AIAG/VDA 7-Step Process** Walk through the unified AIAG/VDA FMEA methodology step-by-step with practical guidance at each stage. - All 7 steps - Entry & exit criteria - Team facilitation 4. 04 **Design FMEA (DFMEA)** Apply DFMEA to identify and mitigate product design failure modes before hardware release. - Function analysis - Failure net - Design controls 5. 05 **Process FMEA (PFMEA)** Apply PFMEA to manufacturing and assembly processes to prevent production-induced failures. - Process steps - Detection controls - Action tracking 6. 06 **Rating Criteria: S, O, D Scales** Master the Severity, Occurrence, and Detection rating criteria with automotive-specific examples for consistent scoring. - 1-10 rating scales - Calibration examples - Cross-team alignment 7. 07 **RPN & AP Calculation** Calculate Risk Priority Numbers and Action Priorities, and learn when each metric is appropriate. - RPN vs AP - Priority thresholds - Action triggers 8. 08 **SPF, Residual & Latent Failures** Identify single-point failures, residual risks, and latent failure modes with safety-specific analysis techniques. - SPF identification - Residual risk - Latent fault analysis 9. 09 **Diagnostic Coverage Linkage** Connect FMEA failure modes to diagnostic coverage claims and validate ISO 26262 Part 5 Annex D assignments. - DC percentage mapping - Annex D alignment - Evidence generation 10. 10 **ISO 26262 Integration** Integrate DFMEA with the ISO 26262 hardware safety analysis process and hardware architectural metrics. - Part 5 requirements - FMEA as safety analysis - Work product alignment 11. 11 **Best Practices** Apply proven best practices for FMEA facilitation, living document management, and quality improvement. - Living document - Facilitation tips - Quality gates 12. 12 **Common Pitfalls** Recognize and avoid the most frequent FMEA mistakes that lead to incomplete analysis and audit findings. - Top 10 mistakes - Audit failure patterns - Remediation steps Interactive Tools ## Not just text: the visual toolkit ### RPN & AP Calculator Compute Risk Priority Numbers and Action Priorities interactively with calibrated S, O, D ratings. ### Failure Net Builder Construct function-failure-effect chains using the AIAG/VDA structure tree approach. ### FMEA Worksheet Fill out a complete DFMEA worksheet with guided rating criteria and automatic AP calculation. ### Diagnostic Coverage Mapper Map failure modes to ISO 26262 Annex D diagnostic mechanisms and calculate coverage percentages. ### SPF Identifier Systematically identify single-point failure candidates in your hardware design using guided analysis. ### 7-Step Process Navigator Step through the AIAG/VDA process with checklist gates and examples at each stage. Real-World Application ## DFMEA for an ASIL-C Electronic Throttle Control (ETC) Module Walk through a complete DFMEA for an Electronic Throttle Control module, from function analysis through action prioritization and ISO 26262 integration. - Function analysis: 12 functions, 34 failure modes identified and rated - Failure net: throttle stuck-open path traced through 4 effects to vehicle level - SPF analysis identified 2 single-point failure candidates requiring design changes - Diagnostic coverage mapped: 89% DC achieved for ASIL-C hardware requirements - Action log: 6 priority actions reduced AP from H to L within 4-week design iteration DFMEA Worksheet FM-007: Position sensor open circuit - Severity: 9, Occurrence: 3, Detection: 4, AP: High Unlock in course Built for ## Who this guide is for - Hardware and system engineers assigned their first DFMEA facilitation - Quality engineers moving from RPN-era FMEA to the AIAG/VDA Action Priority logic - Safety engineers who must link FMEA rows to diagnostic coverage and FMEDA inputs - Teams whose last FMEA came back from audit with completeness findings ## Frequently Asked Questions Common questions about FMEA A Design FMEA analyzes the product design: how a component or system element can fail to perform its function - a sensor open circuit, a stuck-open throttle path - and what design controls prevent or detect it before hardware release. A Process FMEA analyzes manufacturing and assembly: how a correctly designed part can be built wrong - a missed torque, a swapped connector - and which process controls catch it. Both use the same 7-step structure and rating logic but different scopes, effects chains, and control types. The course gives each its own chapter with automotive examples. Each hardware failure mode identified in the DFMEA must be mapped against the safety mechanisms claimed to detect it, and ISO 26262 Part 5 Annex D provides the reference tables for what coverage a mechanism type can claim. That mapping validates the diagnostic coverage percentages used in the FMEDA and the architectural metrics - and exposes single-point failures with no mechanism at all. The course teaches this linkage explicitly, including SPF, residual, and latent failure identification, and the case study reaches an 89% DC claim for an ASIL C throttle control module with traceable evidence. The course has 12 chapters, from FMEA fundamentals through the AIAG/VDA 7-step process, DFMEA, PFMEA, S/O/D rating calibration, RPN versus AP, diagnostic coverage linkage, and ISO 26262 integration, ending with best practices and common pitfalls. It includes 6 interactive tools - among them an RPN and AP calculator, a failure net builder, and a diagnostic coverage mapper - plus a complete DFMEA case study of an ASIL C electronic throttle control module with 34 rated failure modes. A free account starts you off, and the Pro and Expert plans unlock more of the library. ## Start the course today A free account unlocks one full concept guide, 3 work product templates, 1 guided process, the Markov simulator, and 5 practice exams per month. The Pro and Expert plans unlock more of the 78-guide library. No credit card required. 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