Tesla Releases FSD V12.4.3 to Employees [Update: Rollout Continues to More Customers]

By Karan Singh
Not a Tesla App

Following the recent release of V12.4.2 to employees and early access testers, Tesla has now released V12.4.3 to employees, according to X user Farzad. The update is version 2024.15.15.

We recently took a deeper look at the new features available on V12.4.2 here.

Given how rapid-fire Tesla has begun releasing updates to internal testers, employees, and early-access customers, it seems there could be a couple more iterations of V12.4 before it hits customers, as Tesla tunes FSD.

Update: As expected, the release notes remain the same as FSD v12.4.2 and this update just includes bug fixes.

Update 2: In the past hour, early-access customers (“OG testers”) have started receiving this update. This is the first time FSD 12.4.3 has gone out to the public. These owners were previously on FSD 12.4.2, which also didn’t go into a wide release. Given how fast this update went to employees and then to OG testers, Tesla must be testing a specific issue that quickly passed testing. We could see this version expand to additional customers later this weekend or early next week.

Update 3: Tesla has now expanded the rollout to more customers. It has now gone beyond the “OG” testers and to many regular customers. You can follow the progress of the rollout on our statistics page for FSD 12.4.3. This appears to be the version that will go wide to everyone that’s still on a 2024.14 update.

Update 2024.15.15

FSD Supervised 12.4.3
Installed on 0% of fleet
0 Installs today
Last updated: Feb 12, 6:00 am UTC

Why so many Versions and Delays?

While nobody is happy about delays, one needs to keep in mind that Tesla has to keep safety as a priority for FSD releases. If a release goes out wide to hundreds of thousands of vehicles that are unsafe, there could be considerable impacts on people’s lives.

Beyond that, each subversion is Tesla adjusting their AI model, fine-tuning it to be able to better drive in both normal and edge cases. As such, watching these subversion releases go by is a good thing – at the end of the day, we’ll end up with a better, safer product.

Every version also has to be tested internally first among their dedicated ADAS testers, then among employees, and finally with Tesla’s early-access customers. Once all these people give a green light, and most errors and major bugs are addressed, does a release get the green light to go wide.

So, stay tuned for when this release goes out wider than this leak and possibly comes to your vehicle with nag-free FSD.

Tesla Smoking While Supercharging? A Look at What's Actually Happening

By Karan Singh
Hot_Engineering3140 on Reddit

Winter is here, and temperatures are dropping, so one of the most common Tesla questions is about to resurface.

If you’ve landed here after frantically searching about “smoke” coming from your Tesla while Supercharging, take a deep breath—it’s completely normal.

Tesla Smoking While Charging

If you’re Supercharging in freezing weather—even with preconditioning—you might notice steam rising from your Tesla. But rest assured, your car isn’t smoking.

Your Tesla’s heat pump is hard at work warming both the cabin and battery to keep you comfortable and ensure optimal charging temperatures. Over time, condensation and ice build-up in the heat exchanger coils.

Why Does It Happen?

When you reach a Supercharger with your vehicle, the heat pump is still running hot, but without the cold air from driving to keep the heat exchanger coils cool, the ice and condensation quickly start to evaporate—creating what looks like smoke.

Since this typically happens near the front of the vehicle, where a car would traditionally have an engine, new vehicle owners can be startled by the discovery. However, rest assured that it’s just water vapor and it’s completely normal in cold weather.

In fact, this behavior can be experienced in any EV with a heat pump in cold climates. So, if you saw steam coming out of your vehicle and panicked, don’t worry—you’re not alone.

Now that you know what’s happening, go ahead and Supercharge with confidence.

Tesla Improves YouTube App With Smoother Playback

By Karan Singh
Not a Tesla App

Tesla made a lot of improvements in the 2024 Holiday Update, including more than 15 undocumented improvements that were included in the release. One of these was a stealthy performance improvement to the YouTube app.

Several people have mentioned they’ve seen improved performance on YouTube since this year’s Holiday Update - and there’s an interesting reason why.

YouTube Improvements

The improved YouTube performance in Tesla vehicles comes from an unexpected source—Tesla actually rolled back support for YouTube’s newer AV1 video encoding. Instead, vehicles now default to the older VP9 encoding standard.

While AV1 is highly efficient in terms of bandwidth, it requires considerably more processing power to decode and display videos. VP9, on the other hand, is less computationally demanding but uses more bandwidth to achieve the same video quality. This trade-off means smoother playback and better overall performance, even if it comes at the cost of slightly higher data usage.

Intel Inside

The VP9 video codec that the YouTube app is now using is much easier to decode, making it less taxing on the vehicle’s processor. This change is particularly beneficial for Tesla vehicles with Intel processors, which previously struggled to stream video at just 720p. When using AV1, these vehicles often experienced stuttering, sometimes forcing the YouTube app to automatically downgrade playback to 480p.

With this update, Intel-based Teslas should now be able to stream at 1080p smoothly. Streaming at 1440p is also possible, although occasional stutters still occur as the system keeps up with the decoding process.

Intel-based vehicles are the big winners with this change, but this appears to affect AMD Ryzen-based infotainment units as well, providing even smoother playback.

Chromium Web App

Tesla’s Theater apps aren’t native applications; instead, they run as chromeless web apps, leveraging the open-source browser built into Teslas known as Chromium (the open-source version of Chrome). Although this works quite well, there is a severe limitation - Chromium hardware acceleration isn’t supported on Linux, the operating system Tesla uses for their OS.

As a result, Tesla vehicles rely on software decoding instead of hardware decoding, which would otherwise handle video playback far more efficiently. A potential solution could be for Tesla to transition away from Chromium-based web apps in favor of a Mozilla Firefox-based browser, as Firefox does support hardware acceleration on Linux. This switch could also open the door to better streaming performance and the possibility of expanding Tesla’s in-car entertainment options.

However, Tesla’s choice of Chromium likely stems from Digital Rights Management (DRM) requirements for streaming services like Disney+ and Netflix, which rely on DRM-enabled playback. Firefox on Linux has had inconsistent support for DRM due to codec availability and variations in operating system versions.

We’re hopeful that Tesla will either adopt Firefox or develop a fully native application to improve video streaming, rather than continuing with the current web-based Tesla Theater. This shift could also pave the way for additional in-car applications built on Tesla’s native Linux environment—perhaps even reviving the long-rumored Tesla App Store.

Regardless, this update is a welcome improvement, particularly for YouTube, which remains one of the most widely used Theater Mode apps due to its accessibility, free content, and mix of short and long-form videos. It remains to be seen whether similar improvements are made for Netflix, Disney+, or other streaming platforms.

If you’ve noticed improved performance in Theater Mode, now you know why.

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