The National Highway Traffic Safety Administration (NHTSA) has escalated its investigation into Tesla’s Full Self-Driving system. This probe moved from a Preliminary Evaluation to an Engineering Analysis on March 18, 2026. This Tesla Full Self-Driving investigation now covers an estimated 3,203,754 vehicles and focuses on whether the system failed to recognize reduced visibility.
The agency is examining whether camera performance was impaired by environmental factors during crashes. Regulators want to know if the system failed to warn drivers in time to avoid these collisions. An Engineering Analysis is a significant step, but it is not the same as a recall or a final defect finding.
What happened in the Tesla Full Self-Driving investigation?
The NHTSA first opened a Preliminary Evaluation on October 17, 2024, after identifying crashes involving Tesla vehicles using FSD in reduced-visibility conditions. On March 18, 2026, the agency upgraded the matter to an Engineering Analysis. This expanded scope now includes 2016 through 2026 Model S, X, 3, Y, and Cybertruck vehicles equipped with FSD technology.
The current NHTSA Tesla investigation now includes nine documented incidents. One of these accidents resulted in a pedestrian fatality and another in an injury. Regulators are currently examining six additional potentially related incidents to see if a pattern exists.
Tesla reportedly began developing a software update just one day after reporting a fatal crash that occurred seven months prior. The agency suspects Tesla might be under-reporting crashes due to internal data and labeling limitations. These limitations prevent the company from uniformly identifying crashes where the detection system was engaged.
Why does the Engineering Analysis stage matter?
This is a deeper technical review than the original Preliminary Evaluation. It is an important escalation and can precede a Tesla Full Self-Driving recall, but it is not a recall itself. An Engineering Analysis is a more advanced stage where the NHTSA digs deeper into technical performance and data.
Media outlets and industry watchers often describe an Engineering Analysis as the stage that can precede a recall. However, this stage does not guarantee that a recall will happen. The NHTSA has raised serious questions, but no final defect determination should be implied until the agency makes one.
This stage allows regulators to gather more information on the efficacy of software updates. They are looking at the system’s ability to keep individuals safe in less-than-perfect weather conditions. This phase involves deeper technical testing and is typically the final step before a formal recall.
The Timeline of NHTSA’s Tesla Full Self-Driving Investigation
October 17, 2024: NHTSA opens Preliminary Evaluation PE24031
The timeline began on October 17, 2024, when the NHTSA opened Preliminary Evaluation PE24031. At that time, the scope included 2,410,002 vehicles, ranging from the 2016 Model S to the 2024 Cybertruck. Four crashes were identified at the start of that initial evaluation.
November 2024: NHTSA requests information from Tesla
By November 2024, the NHTSA formally requested information from Tesla regarding FSD performance in reduced visibility. The agency wanted to know if drivers received adequate feedback when the capabilities of the system were exceeded. This request highlighted concerns about how individuals might misunderstand the limits of the technology.
March 18, 2026: NHTSA upgrades the matter to Engineering Analysis EA26002
On March 18, 2026, the matter was upgraded to Engineering Analysis EA26002 with an expanded scope of 3,203,754 vehicles. The investigation now includes 2016-2026 Model S and X, 2017-2026 Model 3, and 2020-2026 Model Y. Regulators are currently examining the updated degradation detection system and warning capabilities.
What is NHTSA actually investigating?
The core issue is whether the system knew or should have known it could not see well enough to operate. This is not just a general crash investigation. The problem description is the possible failure of the FSD degradation detection system to detect degraded visibility.
Tesla’s FSD relies on a camera-only system, Tesla Vision, rather than radar-plus-camera sensing. The NHTSA says that in crashes it reviewed, the system did not detect common roadway conditions impairing visibility. Reduced visibility includes sun glare, fog, and airborne dust.
In several cases, the vehicle allegedly lost track of or never detected a lead vehicle in its path. Tesla admitted that its updated detection system would have only potentially affected 3 out of 9 identified crashes. This means the update would not have helped in the majority of cases.
What this may mean for injured individuals and families
Federal investigations can become important evidence in product liability, wrongful death, and serious injury claims. An investigation alone does not decide civil liability. A crash involving driver-assistance technology can raise overlapping questions about driver conduct and product design.
In a serious injury or wrongful death case, attorneys often examine event data and software version history. They look at recall or investigation records and onboard warnings. They also check if the system was marketed in a way that overstated its capabilities.
If a serious crash involved driver-assistance features, early investigation matters. Vehicle data and update history may become critical for an autonomous driving accident claim. Legal teams must analyze whether a driver assistance system failure occurred during the incident.
What Tesla drivers and passengers should know right now
FSD is still described as a driver-supervised system, not a fully autonomous vehicle. Reduced visibility can include glare, dust, and fog, not only storms or nighttime conditions. Individuals involved in a crash should preserve photos, video, and dashcam footage.
App screenshots, service records, and software version information are also vital. You should keep the crash report and all medical records. These documents help a Tesla crash lawyer build a case.
The NHTSA escalation is a meaningful development because it shows regulators are taking a deeper look at safety. For injured individuals, the investigation helps in understanding if a system failed when it mattered most. Safety remains the top priority for all persons on the road.
Miami’s Top-Rated Accident Attorneys Protecting Your Rights
Panter, Panter & Sampedro represents individuals and families in serious injury and wrongful death cases. Our experienced accident trial attorneys handle complex liability questions involving motor vehicle crashes. When a crash involves advanced driver-assistance technology, early review of safety records can matter.
Our firm has a successful track record of winning cases for the last 30 years. We work one-on-one with personal injury clients to get the justice they deserve. If you need a Tesla crash lawyer, our dedicated team is here to help.
We prioritize the privacy of our clients and focus on the Tesla Full Self-Driving investigation. We provide a free consultation and operate on a no recovery = no fee basis.
More articles on Tesla’s Legal Issues
Frequently asked questions
What is Tesla Full Self-Driving being investigated for?
The NHTSA is investigating whether the degradation detection system failed to recognize reduced-visibility conditions. They are checking if the camera performance was impaired.
How many Tesla vehicles are covered?
The Engineering Analysis covers an estimated 3,203,754 vehicles.
Has Tesla recalled vehicles because of this investigation?
As of March 19, 2026, NHTSA had upgraded the investigation to an Engineering Analysis, but that is not the same as a recall.
What visibility conditions are part of the probe?
NHTSA references glare, fog, and airborne dust or obscurants.
What should an injured individual do after a Tesla crash involving FSD?
Seek medical care, preserve evidence, and document the vehicle, software, and crash details as early as possible.
Sources
- Reuters. “NHTSA opens probe into 2.4 million Tesla vehicles over Full Self-Driving collisions.” Published October 18, 2024. Available at: https://www.reuters.com/business/autos-transportation/nhtsa-opens-probe-into-24-mln-tesla-vehicles-over-full-self-driving-collisions-2024-10-18/
- Electrek. “Fatal Tesla crash with Full Self-Driving Supervised triggers NHTSA investigation.” Published October 18, 2024. Available at: https://electrek.co/2024/10/18/fatal-tesla-crash-with-full-self-driving-supervised-triggers-nhtsa-investigation/
- National Highway Traffic Safety Administration (NHTSA), Office of Defects Investigation. “Preliminary Evaluation PE24031 Resume.” Investigation opened October 17, 2024. Available at: https://static.nhtsa.gov/odi/inv/2024/INOA-PE24031-23232.pdf
- National Highway Traffic Safety Administration (NHTSA), Office of Defects Investigation. “Information Request Letter to Tesla, Inc. re: PE24031.” Dated November 5, 2024. Available at: https://static.nhtsa.gov/odi/inv/2024/INIM-PE24031-27346.pdf
- Electrek. “NHTSA upgrades Tesla FSD visibility investigation to engineering analysis covering 3.2 million vehicles.” Published March 19, 2026. Available at: https://electrek.co/2026/03/19/nhtsa-upgrades-tesla-fsd-visibility-investigation-3-2-million-vehicles/
- Reuters. “US auto safety regulator upgrades Tesla probe over Full Self-Driving crashes.” Published March 19, 2026. Available at: https://www.reuters.com/business/autos-transportation/us-auto-safety-regulator-opens-probe-into-tesla-vehicles-with-fsd-2026-03-19/
- National Highway Traffic Safety Administration (NHTSA), Office of Defects Investigation. “Engineering Analysis EA26002 Resume.” Investigation upgraded March 18, 2026. Available at: https://static.nhtsa.gov/odi/inv/2026/INOA-EA26002-10023.pdf
