Tesla FSD v14.3.9 Release Notes (Update 2026.27.5): Automatic Collision Evasion Arrives

Tesla has published release notes for update 2026.27.5, which ships Full Self-Driving (Supervised) v14.3.9. This one is currently an employee release, so it isn't in wide public rollout yet, but the notes give us a clear look at what's coming — and the headline feature is a genuinely new safety capability called Automatic Collision Evasion.

Automatic Collision Evasion: FSD steps in while you're driving

This is the big one. Automatic Collision Evasion can activate Full Self-Driving (Supervised) to try to keep your vehicle safe and then continue driving — even when you're driving manually. Per Tesla's notes, it can engage in two situations:

• Scenario 1: A frontal collision is imminent and braking alone may not avoid it.
• Scenario 2: Your vehicle detects that you aren't sufficiently attentive to the road (Tesla's example: reaching toward the back seat), or that Full Self-Driving (Supervised) may have been unintentionally disengaged.

The important distinction from existing automatic emergency braking is that this system may take over steering, not just slow you down. Tesla points owners to the Owner's Manual for full details. The feature is listed for HW4 vehicles.

Automatic Collision Evasion activates Full Self-Driving (Supervised) to try to keep your vehicle safe and then continue driving.

One practical note for owners: a system that reacts to whether you're "sufficiently attentive" pairs poorly with a cabin where your phone, drinks, and gear are sliding around. A secure phone mount and organized center console keep your hands on the wheel and your eyes forward — which is exactly the behavior the updated driver monitoring is watching for.

What's new in FSD (Supervised) v14.3.9

Beyond the marquee safety feature, v14.3.9 is a substantial under-the-hood release. Highlights from Tesla's notes:

• Upgraded reinforcement learning training for the FSD neural network, with improvements across a wide variety of driving scenarios.
• New neural network vision encoder — better understanding in rare and low-visibility scenarios, stronger 3D geometry understanding, and expanded traffic sign recognition.
• AI compiler and runtime rewritten from the ground up with MLIR, delivering a claimed 20% faster reaction time and quicker model iteration.
• Less lane biasing and tailgating — two of the most commonly reported nitpicks from daily drivers.
• More decisive parking, including faster spot selection and maneuvering, plus improved parking location pin prediction shown on the map with a P icon.
• Better responses to emergency vehicles, school buses, right-of-way violators, and other rare vehicles.
• Improved handling of small animals, with RL training focused on harder examples and rewards tuned for proactive safety.
• Better traffic light handling at complex intersections with compound lights, curved roads, and yellow-light stopping.
• Rare objects extending, hanging, or leaning into the vehicle's path are handled better, sourced from infrequent fleet events.
• Graceful recovery from temporary system degradations, maintaining control and recovering automatically without driver intervention — meaning fewer unnecessary disengagements.
• Improved driver monitoring with better eye-gaze tracking, improved eyewear handling, and higher accuracy in variable lighting.

Carried-over features worth knowing

Tesla also re-lists several items introduced across the v14.3.x line. The model is now unified between Actually Smart Summon, FSD, and Robotaxi (new in v14.3.2 for non-Cybertrucks, v14.3.4 for Cybertruck), and Actually Smart Summon's max speed is up to 8 mph / 13 km/h (added in v14.3.3, not available on Cybertruck).

You can also select an intervention reason on the main screen after taking over to help Tesla improve the system (v14.3.2), see distance traveled in FSD without an intervention along with your longest intervention-free streak in the Self-Driving App (v14.3.3), and view parking options on the map when arriving at your destination (v14.3.4).

What Tesla says is coming next

The notes list two upcoming improvements: expanding reasoning to all behaviors beyond destination handling, and adding pothole avoidance. The second one will be welcome news for anyone running low-profile tires or aftermarket wheels.

The bottom line

Version 14.3.9 is listed for HW4 Model S, 3, X, Y, and Cybertruck. Tesla's standard reminder still applies: Full Self-Driving (Supervised) does not make your vehicle autonomous, and you must remain attentive at all times. To use it, press the Start Self-Driving button on the UI or press the right scroll wheel once; it can be turned off in Autopilot Settings.

Since this is an employee release, don't expect 2026.27.5 to land in your driveway this week. But the direction is clear — faster reactions, fewer disengagements, sharper parking, and a safety net that can now steer. If you're prepping for more hands-off-adjacent driving time, this is a good moment to tidy up the cockpit: a solid phone mount, a clean dash, and roadside safety gear in the trunk are the low-effort upgrades that make every software improvement easier to live with.