Tesla FSD 14.3.9 Now Shows a Public Rollout in Trackers After Zero Observed Installs Sept. 6

Update, Sept. 14, 2026: The deployment state in this article has changed since its original Sept. 6 publication. The earlier tracker-listed employee build with zero observed cars remains the historical baseline, but multiple third-party software trackers now show FSD (Supervised) v14.3.9 in a public, nonzero rollout.

Not a Tesla App now describes software 2026.27.6 as the first public version of FSD v14.3.9. Tessie separately labels the same build ROLLING OUT, while Teslascope shows 2026.27.6 with a nonzero share in its own recorded-update sample.¹²³

That is materially different from the state recorded here on Sept. 6, when Not a Tesla App labeled 2026.27.5 an employee release and its TeslaFi-powered statistics showed zero tracked cars for that build.⁴⁵ At the newsroom's Sept. 14 02:12 MT check, Not a Tesla App's 2026.27.6 page showed 494 tracked cars, or 4% of its TeslaFi-derived tracked sample.¹

The scope matters: 4% of that tracker sample is not 4% of all Teslas. The tracker data does not establish that the rollout is complete, that most eligible vehicles have received the build, or that every vehicle otherwise capable of FSD 14.3.9 is included.¹²³

The current evidence supports a public rollout — with tracker-sized limits

The three tracking surfaces agree on the important directional change even though their displayed timing differs slightly. Not a Tesla App dates 2026.27.6 to Sept. 8 and calls it the first public FSD 14.3.9 version; Teslascope first noticed the build Sept. 8; Tessie displays a Sept. 9 release date and marks it rolling out.¹²³

That is enough to update the Sept. 6 description. FSD 14.3.9 is no longer accurately characterized only by the employee-build, zero-observed-distribution state that was visible when this article first published. The defensible current wording is narrower: third-party trackers show a public, nonzero rollout of 2026.27.6.⁴¹²³

The rollout classification and distribution figures in this update come from those tracker surfaces, not from a Tesla-published fleet census. Tesla's current owner-facing FSD support material continues to say FSD is Supervised, requires active driver attention and does not make the vehicle autonomous.⁶

The Automatic Collision Evasion text changed, but that does not prove the behavior changed

There is also a documentation difference between the employee and public builds. Not a Tesla App's preserved 2026.27.5 release-note page described Automatic Collision Evasion in two situations: an imminent frontal-collision scenario in which braking may not be enough, and a separate inattentive-driver or unintended-disengagement scenario.⁴

The current 2026.27.6 page displays only the inattentive-driver or unintended-disengagement scenario in its visible Automatic Collision Evasion description and notes that the employee version used slightly different release notes.¹

That establishes a release-note text change, not that Tesla removed the earlier frontal-collision behavior from the software. The reviewed evidence does not establish whether the wording difference reflects a product change, a documentation edit or another explanation.⁴¹

Rollout data is not safety-effectiveness data

The original Sept. 6 article covered Tesla's announcement of Automatic Collision Evasion as an active-safety capability associated with FSD 14.3.9.⁵ The newer distribution evidence answers a different question: whether the software has progressed beyond the tracker-listed employee build.

It does not establish how often Automatic Collision Evasion intervenes, its false-positive rate, or a real-world crash-prevention rate. None of the public evidence reviewed for this update provides those performance measures.⁴¹²³⁶

Tesla's current FSD support guidance remains the relevant baseline for driver responsibility: the system is supervised and requires active attention.⁶

Sources

Footnotes

1. Update 2026.27.6 (FSD 14.2 Lite & 14.3.9) — Release Notes — Not a Tesla App, Sept. 8, 2026; newsroom observation Sept. 14, 2026 at 02:12 MT. https://www.notateslaapp.com/software-updates/version/2026.27.6/release-notes Calls 2026.27.6 the first public FSD 14.3.9 version and, at that timestamped observation, showed 494 cars / 4% of its TeslaFi-derived tracked sample. Its dynamic sample cannot be generalized to Tesla's full fleet. The page also preserves the public-build Automatic Collision Evasion wording used for the documentation comparison. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

2. 2026.27.6 release notes & statistics — Tessie, observed Sept. 14, 2026. https://stats.tessie.com/versions/2026.27.6 Labels 2026.27.6 ROLLING OUT, displays a Sept. 9 release date and reproduces FSD 14.3.9 / Automatic Collision Evasion release-note content. Tessie is a third-party software tracker and does not establish Tesla fleet-wide rollout penetration. ↩ ↩² ↩³ ↩⁴ ↩⁵

3. Vehicle Software Updates — Teslascope, observed Sept. 14, 2026. https://teslascope.com/software Lists 2026.27.6 / HW4 FSD 14.3.9 with a Sept. 8 first-noticed date and a nonzero share among Teslascope's recorded vehicle updates. Its observed-update dataset is not a Tesla fleet census. ↩ ↩² ↩³ ↩⁴ ↩⁵

4. Update 2026.27.5 (FSD 14.3.9) — Release Notes — Not a Tesla App, Sept. 6, 2026; observed again Sept. 14, 2026. https://www.notateslaapp.com/software-updates/version/2026.27.5/release-notes Describes 2026.27.5 as the employee FSD 14.3.9 release, shows zero cars in its TeslaFi-derived tracker state, and preserves the employee-build Automatic Collision Evasion wording. It is a third-party tracker/release-note archive, not a Tesla fleet census. ↩ ↩² ↩³ ↩⁴ ↩⁵

5. Tesla Says FSD 14.3.9 Can Activate During Manual Driving — Sept. 6 Build Is Tracker-Listed as an Employee Release — At The Charger / Autonomous News Desk, Sept. 6, 2026. https://www.atthecharger.com/article/tesla-fsd-1439-automatic-collision-evasion-employee-release Prior packet-backed coverage used here only to preserve the article's original reader promise and timestamped Sept. 6 deployment-state baseline; current rollout claims are independently sourced above. ↩ ↩²

6. Full Self-Driving (Supervised) Trial for New Owners / current FSD support material — Tesla, observed Sept. 14, 2026. https://www.tesla.com/support/fsd/trial-for-new-owners Tesla's current owner-facing support material states that FSD remains supervised, requires active driver attention and does not make the vehicle autonomous. It does not establish the third-party 2026.27.6 rollout counts used above. ↩ ↩² ↩³