FSD V14.3.7 Wave 2 Is Rolling Out: Check If Your AI4 Tesla Is Next

Tesla has pushed a second wave of software update 2026.21.5, carrying Full Self-Driving V14.3.7 to roughly 1,100 additional AI4-equipped vehicles. If you haven't received it yet and you're on Hardware 4, your notification could arrive within hours — here's what the update brings and how to make sure you're first in line.

What's Inside 2026.21.5

The official release notes for 2026.21.5 appear nearly identical to the previous FSD V14.3.6 on the surface, but the under-the-hood changes are meaningful. According to background research from multiple tracking sources, V14.3.7 delivers several concrete improvements over its predecessor:

The brake-stuttering fix is arguably the most owner-relevant change. V14.3.6 introduced hesitant, choppy braking behavior that frustrated a number of early adopters — V14.3.7 specifically targets that regression.

Who Gets It — and Who Doesn't

This update is exclusive to AI4 (Hardware 4) vehicles. If you're still on Hardware 3, you will not receive V14.3 in its current form. According to background research, a separate "FSD v14 Lite" build for HW3 is in testing and expected later in 2026, but no release date has been confirmed.

The first wave of 2026.21.5 began rolling out around August 1–3, initially reaching early access members and a small slice of the HW4 fleet. This second wave — flagged by @teslascope and @NowRollingOut within minutes of each other on August 6 — expands that reach by approximately 1,100 vehicles. Broader rollout to the wider North American HW4 fleet is expected to follow as Tesla monitors feedback.

How to Check and Grab the Update Now

Tesla's OTA system delivers updates on its own schedule, but there are a few things you can do to move to the front of the queue:

1. Connect to Wi-Fi at home. Updates almost always download over Wi-Fi, not LTE. Plug in and connect before bed — Tesla typically installs overnight when the car is idle and charging.
2. Check for updates manually. On your touchscreen, go to Controls → Software. If an update is staged, you'll see a yellow clock icon. Tap Install Now if you don't want to wait for the scheduled window.
3. Enable Advanced Updates (if available). In the same Software menu, look for the update preference toggle. Setting it to Advanced opts you into earlier access for future releases.
4. Verify your hardware generation. Go to Controls → Software → Additional Vehicle Information. Confirm your Autopilot computer reads "Full Self-Driving Computer (AI4)" or "Hardware 4." If it shows HW3, this wave isn't for you yet.
5. Check your version after install. Once updated, your software version should read 2026.21.5 and your FSD version should show V14.3.7 under Controls → Autopilot → Full Self-Driving.

What to Watch After You Update

The two things worth paying close attention to once V14.3.7 is installed: braking smoothness on approach to stops (the regression fix is the headline change here), and Summon behavior if you use it regularly. Tesla made substantial changes to Actually Smart Summon in this build, so your muscle memory from V14.3.6 may need recalibrating.

For owners who use FSD daily, the 20% faster reaction time from the MLIR2 compiler rewrite is the kind of change that's hard to quantify in a parking lot but becomes obvious in complex highway merge situations. Give it a few hundred miles before drawing conclusions.

With the second wave now live and fleet data confirming active deployment, a broader third wave is likely within days. Keep your car on Wi-Fi tonight.

📋 Tracking Tesla software? See every firmware, FSD and app version in one place in our Tesla Software Update Tracker.

This report was curated by the BASENOR Editorial Desk from the sources listed above. Read our editorial standards or email editorial@basenor.com to report an error.