I am writing to formally bring to your attention a potential violation of federal vehicle safety reporting requirements by Audi regarding an Electronic Control Unit (ECU)/Comfort Control Module failure in my 2018 Audi A5. As the original owner of this vehicle, I experienced a critical ECU failure approximately 2yrs after purchase (Sept 2017), which I believe qualifies as a major safety defect under 49 CFR 573.6-577.7. According to federal regulations, manufacturers are required to report such safety defects to the NHTSA within five (5) days of discovery. Furthermore, a root cause analysis should have been conducted & its findings reported w/in sixty (60) days. However, I have strong reason to believe that Audi failed to meet these reporting obligations, as I have never been provided with any findings from the investigation, nor have I seen any publicly available reporting on this defect. Key Concerns: -?? Unexplained ECU Failure: My vehicle-??s ECU/Comfort Control Module failed inexplicably despite being only 2yrs old at the time. -?? Failure to Report to NHTSA: I haven't found record of Audi disclosing this issue to the NHTSA, despite clear requirement to do so. -?? Root Cause Analysis Not Provided: Audi informed me that analysis was conducted in Germany, but I was repeatedly told that the results were -??not yet available.-?? This raises concerns that the findings may have revealed a broader defect affecting multiple vehicles of the same model/yr. -?? Potential Safety Risk: If this is not an isolated case, other Audi A5 owners may unknowingly be at risk of ECU failures, which could lead to critical vehicle malfunctions, including loss of control, electrical failures, or immobilization while driving. Given the seriousness of this issue, I urge the NHTSA to investigate Audi-??s compliance with 49 CFR 573.6-577.7 & determine if this defect affects a broader range of vehicles. If Audi has indeed failed to report this defect properly, appropriate action be taken for consumer safety

- King Of Prussia, PA, USA

Start stop system failure Warning displayed Check engine light Car hesitates IF the start stop happens to decide to function At times it won-??t work at all

- Allentown, PA, USA