Tesla FSD V14.3.9 and V14.2 Lite Rolling Out

Tesla FSD Beta Autopilot

September 2026 – Tesla continues to roll out FSD v14 releases to Hardware 4 vehicles. Those with Hardware 3 are starting to receive “FSD v14 Lite” which is currently rolling out and will be made widely available to Hardware 3 vehicles, including Model S and X in 2026.

FSD Beta – Wider Releases

FSD 14 – Tesla’s Full Self-Driving (FSD) is entering one of its most significant transition phases since the jump to v12. FSD V14.3.X is currently HW4/AI4-only (the full, uncompromised version). Hardware 3 (HW3) vehicles — found in Teslas built roughly through early 2023 will not receive V14.3 in its current form. Tesla has been very clear (in earnings calls and public statements): They are providing a FSD v14 Lite version (or optimized/pruned v14 branch) specifically for HW3, which has now been rolled out – see below for more.

FSD v14.3.9 Rolling out with Automatic Collision Evasion (ACE)

Tesla has officially announced the rollout of FSD (Supervised) v14.3.9 (associated with software update 2026.27.6), introducing a major active safety feature called Automatic Collision Evasion.

FSD v14.3.9 Initial Take from Testers

The Tesla Full Self-Driving (FSD) v14.3.9 update introduces a major new safety capability alongside key under-the-hood performance updates. The headline feature is Automatic Collision Evasion, an automated safety net that engages FSD Supervised during manual driving if a frontal collision is imminent or if driver inattention is detected. Under the hood, the release includes a rewritten AI compiler delivering 20% faster reaction times, boosted Actually Smart Summon (ASS) speeds up to 8 mph, and new camera visualization zoom controls on screen. While overall driving smoothness and highway lane discipline show noticeable polish, low-speed parking and parking lot navigation continue to present familiar challenges

The Pros: Major Improvements

  • Proactive Collision Evasion: Introduces an automated safety backup that engages FSD while driving manually (active between 22.5 mph and 85 mph) if a frontal collision is detected or if the driver becomes inattentive or accidentally disengages the system.
  • Superior Road Smoothness & Obstacle Avoidance: Demonstrates composed, human-like handling around pedestrians, double-parked vehicles, open doors, and puddles, avoiding sudden, unnecessary brake taps.
  • Refined Highway Profile Discipline: Speed profiles like "Hurry" exhibit better lane discipline, actively moving out of the left passing lane when faster traffic approaches behind.
  • Decisive Intersection Handling: Executes unprotected left turns and U-turns with high confidence, fluidly rolling through open gaps without stopping unnecessarily.
  • Interface & Speed Enhancements: Adds direct visualization zoom toggles on screen and increases Actually Smart Summon operating speeds up to 8 mph.

The Cons: Persistent Limitations

  • Persistent Parking Stack Failures: Low-speed parking remains erratic; the car frequently stops short in angled spots due to top-camera blind spots, parks un-centered within lines, or selects prohibited/reserved spaces.
  • No User Toggle for Collision Evasion: The new Automatic Collision Evasion feature cannot be toggled on or off in the vehicle settings menu, requiring separate driver profiles with FSD disabled for track or spirited manual driving.
  • Navigation & Parking Lot Looping: In complex parking lots or destinations without updated map data, the system can get caught in endless loops or ignore dropped navigation pins.
  • Missing Speed Controls & Pothole Avoidance: Drivers still cannot set an explicit maximum speed override, and pothole/speed bump detection remains incomplete

FSD v14.2 Lite for HW3 Vehicles

Tesla’s FSD v14.2 Lite update delivers a refined distilled model tailored specifically for Hardware 3 (HW3 or AI3) vehicles. Designed to optimize performance on legacy hardware, the release focuses on smarter look-ahead planning, smoother residential handling, and key low-speed maneuvering fixes, alongside subtle user interface enhancements. While the build brings noticeable progress in driving composure and safety awareness, persistent challenges remain around parking precision and complex navigation

FSD V14.2 Lite First Impressions

The Pros: Major Improvements

  • Smarter Residential Look-Ahead: The software plans several steps ahead in neighborhood driving, using regenerative braking to temper speed smoothly over speed bumps prior to stop signs without abrupt acceleration. It also pre-selects turning lanes to avoid getting boxed in after completing turns.
  • Upgraded Reversing & Obstacle Avoidance: Low-speed reversing performance sees major fixes, with the vehicle successfully backing into tight third-party charging stalls and halting to avoid obstacles like trash cans in driveways.
  • Proactive Hazard & Safety Responses: Demonstrates quick safety reactions, such as pulling off the road when an emergency vehicle approaches from behind, swerving slightly to avoid cars edging into its lane, and leaving extra clearance when passing double-parked trucks.
  • Smooth Turning & Lane Decisions: Handles challenging unprotected left turns naturally and executes quick, decisive lane changes when operating under active speed profiles like "Hurry".
  • UI & Navigation Enhancements: Features automated navigation pattern suggestions on startup and adds a clean white border around the on-screen parking symbol for better contrast.
  • Reduced Steering Wheel Wobble: Low-speed steering wheel wobble around 40 mph is visibly reduced compared to previous HW3 builds

The Cons: Persistent Limitations

  • Inconsistent Parking Execution: Low-speed parking remains erratic; the car can park off-center, back in too far beyond designated spaces, or select illegal/reserved spaces such as handicap stalls.
  • Navigational & Entrance Errors: The system can still make critical pathing mistakes in private roads or parking areas, such as driving down an exit ramp instead of the entrance.
  • Speed Limit & Map Discrepancies: The software occasionally fails to update posted speed limit drops correctly or defaults to higher speeds on unmarked back roads.
  • Highway Left-Lane Camping: On highways, the vehicle can linger in the left passing lane rather than returning to the right lane when clear.
  • Sun Glare Sensitivity: Direct harsh sunlight can blind side or front cameras, triggering camera warning alerts or forcing disengagements.
  • Residual Steering Wobble: While improved, steering wheel wobble around 40 mph or after traversing road bumps is not completely eliminated

FSD V14 Lite for Model S & Model X

FSD (Supervised) v14 Lite has not yet begun rolling out to Hardware 3 (HW3/AI3) Model S and Model X owners as of September 12, 2026, though Tesla’s AI lead indicated it was expected imminently.

What’s Coming Up Next for FSD?

Tesla’s autonomy roadmap is currently in a transition phase, deploying FSD v14.3 while preparing for major upcoming milestones, including optimized support for older hardware and the eventual leap to version 15. This progression focuses on stabilizing the current architecture, introducing end-to-end autonomous parking, and significantly increasing model complexity to achieve true unsupervised autonomy,.

Key Roadmap Milestones

  • “Banish” Autonomous Parking: Slated for the Summer 2026 update, this end-to-end solution allows a driver to exit at a store entrance while the car independently navigates a parking lot to find a spot and park itself.
  • FSD v15 Architectural Shift: Planned for late 2026 or early 2027, v15 will introduce a 10-billion parameter model. This 10x increase in parameters is intended to enable “active reasoning,” allowing the vehicle to better anticipate hidden hazards and handle chaotic environments like multi-lane roundabouts.
  • HW4/AI4 Compatibility: Tesla has confirmed that v15 will run natively on current Hardware 4 (AI4) systems through aggressive model distillation, dispelling fears that it would require next-generation hardware.
  • Gateway to Robotaxis: The deployment and validation of the v15 architecture is the explicit prerequisite for “Unsupervised FSD” and the launch of Tesla’s commercial Robotaxi fleet.

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