One Step From a Recall
The National Highway Traffic Safety Administration has escalated its investigation into Tesla's Full Self-Driving (FSD) system, upgrading a preliminary examination into an Engineering Analysis covering an estimated 3,203,754 Tesla vehicles. The upgrade is significant: Engineering Analysis is the final investigative stage before NHTSA can formally request or demand a recall.
The specific issue under scrutiny is FSD's handling of reduced visibility conditions. NHTSA found that the system's degradation detection fails to reliably warn drivers when cameras are blinded by sun glare, fog, heavy rain, or other common road conditions that impair the optical sensors FSD depends on. When cameras are compromised, the system's ability to detect obstacles, lane markings, and other vehicles degrades — but drivers may not receive adequate warning that the autonomous features are operating at reduced capability.
The Camera-Only Gamble
Tesla's approach to autonomous driving has long been controversial within the industry. While competitors have adopted sensor fusion strategies that combine cameras, lidar, and radar to maintain situational awareness across varying environmental conditions, Tesla has insisted that cameras alone — paired with powerful AI — are sufficient for safe operation.
The FSD visibility investigation directly challenges that premise. Lidar systems are inherently immune to the visual impairments that cameras face: fog that blinds a camera doesn't affect a lidar's distance measurements, and sun glare that saturates a camera sensor doesn't interfere with laser pulses. Tesla removed radar from its vehicles in 2021, arguing that the technology was unnecessary overhead. NHTSA's probe suggests the consequences of that decision are now coming into regulatory focus.
What the Investigation Found
NHTSA's preliminary examination identified a pattern of crashes and incidents in which FSD was active during reduced visibility conditions. The agency also found evidence suggesting Tesla may be under-reporting related crashes — a serious allegation that could compound the regulatory and legal exposure the company faces.
The degradation detection issue has a specific technical dimension: FSD is designed to monitor camera inputs and alert drivers when performance may be compromised. NHTSA's findings indicate this monitoring system has gaps, allowing FSD to continue operating in conditions where its real-world performance has significantly declined without adequately communicating that decline to the driver.
What Happens Next
Tesla has not publicly commented specifically on the Engineering Analysis upgrade. The Engineering Analysis stage typically involves NHTSA engineers conducting their own testing, reviewing Tesla's data submissions, and potentially interviewing company engineers. If the analysis concludes that a safety defect exists, NHTSA can request a recall. If Tesla refuses, the agency can mandate one through federal court.
The scope of the potential recall — over 3.2 million vehicles — would be one of the largest in Tesla's history and could require a software update that either disables FSD in reduced visibility conditions or improves the system's detection and warning capabilities. For Tesla, the investigation represents a significant regulatory test at a moment when the company's autonomous driving ambitions are central to its valuation narrative.
This article is based on reporting by Electrek. Read the original article.
