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https://static.nhtsa.gov/odi/inv/2026/INOA-EA26002-10023.pdfNHTSA has escalated its investigation into Tesla’s “Full Self-Driving” system’s inability to handle reduced visibility conditions, upgrading the probe to an Engineering Analysis covering an estimated 3,203,754 vehicles — the step that typically precedes a recall.
According to NHTSA, FSD’s degradation detection system — the software designed to recognize when cameras can’t see properly and alert the driver — fails under common roadway conditions.
NHTSA states that in the crashes it reviewed, the system “did not detect common roadway conditions that impaired camera visibility and/or provide alerts when camera performance had deteriorated until immediately before the crash occurred.”
Worse, the vehicles either lost track of or completely missed other cars directly ahead of them before impact. The system essentially went blind and didn’t know it — or told the driver too late to do anything about it.
NHTSA also flagged a concerning data gap. Tesla told the agency that internal “data and labeling limitations” prevented it from uniformly identifying and analyzing crashes that occurred while the degradation detection system was engaged.
NHTSA believes this limitation “could have led to under-reporting of subject crashes over portions of the defined time-period.”