Every release includes other smaller changes that go unlisted. In addition, there are sometimes other code additions or features that aren’t active yet or development is still ongoing.
Shadow Mode
Sometimes Tesla runs changes in shadow mode, meaning that the change is in the software, but it’s running in the background. This is often useful if you have a working version of a feature, but are planning to replace it with an updated or improved version.
A good example is when Tesla started rolling out Park Assist for vehicles without ultrasonic sensors. For months, Tesla was running the updated Tesla Vision system in shadow mode and comparing its output to the values provided by ultrasonic sensors. By using the ultrasonic sensors as the “truth,” Tesla was able to constantly improve its vision-based replacement before finally rolling it out to users.
In update 2024.20, Tesla has several changes happening under the hood. Some of them are likely gathering data and others running may be running in shadow mode.
New “Voyage” Trip Planner
Tesla’s trip planner received a big update in December of 2022 and has been exceptionally performant. It provides accurate trip data, calculating in Supercharger stops – including wait times and station closures, and factors in elevation, user driving style, and traffic all into one package.
However, it has been a while since Tesla has made updates to the trip planner. Tesla hacker Greentheonly dug deep into 2024.20.1 and found a new trip planner called “Voyage” hidden in the update. It seems to be a full rewrite of the trip planner functionality.
At this point, no further details are available, but it could be integrated with 8/8’s Robotaxi announcement. It may be running in shadow mode now, letting Tesla gather data and compare it to the current implementation.
Updates to Maps & Towing
It looks like Tesla is also making some updates to maps, according to Green. He noticed that Tesla is using a new Google Places API that is used for points of interest.
There are also towing changes in this update, but don’t appear to be activated yet. They could provide more accurate range estimates. Previously, users would have to take into account the impact on range from trailer towing on their own. In the future, Tesla may be taking your trailer load into account when determining your range.
Caraoke to Gain Recording Mode
Caraoke, Tesla’s version of Karaoke, is also expected to gain a new recording mode according to Green. He spotted references to a new “Recording Studio”, enabling you to record your karaoke session. It would also give you the ability to add special effects to the recording. When Tesla adds this functionality, we could see it come with an export option that would let you save it onto a USB drive, letting you share it with friends on social media.
It’d be fun if Tesla also incorporated the cabin camera so that the recording featured everyone singing as well, but we may just have to wait and see how Tesla plans to incorporate changes to its Caraoke service.
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Tesla’s been on a roll with Supercharger improvements lately, from the 325kW charging update for the Cybertruck, to 500kW with V4 Superchargers coming next year. While those improvements have been limited to the Cybertruck, Tesla didn’t put all their focus on their new flagship vehicle, but looked at their more affordable vehicles as well.
LFP Battery Heating
Tesla’s Superchargers can now heat LFP Batteries - those that are in the Model 3 and Model Y Rear Wheel Drive variants. This applies to Long Range and Standard Range models, which saw a limited run. This is another update included as part of the 2024 Tesla Holiday Update - which really arrived with a lot of unannounced new features and capabilities.
The change is pretty interesting - Superchargers of the V3 and V4 variety can now pre-heat batteries for Model 3 and Model Y vehicles equipped with LFP battery packs. That means those vehicles are able to get back on the road faster when it's extremely cold. Of course, Tesla still advises you to precondition before you arrive, saving drivers time and money.
Max de Zegher, Tesla’s Director of Charging, also commented on the new feature. Essentially, Tesla is inducing an AC (alternating) ripple current through the battery to warm it up. Keep in mind that Superchargers are DC charging. That means it is possible to get a cold-soaked LFP vehicle on the road 4x faster than before, assuming that it didn’t precondition at all and that it is in the worst-case scenario (below 0ºF).
In essence, Tesla is using some engineering magic to turn the circuits inside the LFP battery into an electric heater - and powering that heater through the Supercharger. An AC ripple current is a small oscillation in the DC charging current that generates heat through electrical resistance, warming up the battery. Those ripples are a byproduct of converting AC to DC and back - so Tesla is using the onboard charger to induce those ripples to warm up the battery. Definitely an innovative technique that’s really only possible with the versatility of the NACS connector.
We’re hoping Tesla can implement this across their full lineup of vehicles, but we’ll have to wait and see how it is trialed across LFP vehicles first and if it is even possible on vehicles with 2170 or 4680 battery packs.
Tesla launched two FSD updates simultaneously on Saturday night, and what’s most interesting is that they arrived on the same software version. We’ll dig into that a little later, but for now, there’s good news for everyone. For Hardware 3 owners, FSD V12.6.1 is launching to all vehicles, including the Model 3 and Model Y. For AI4 owners, FSD V13.2.4 is launching, starting with the Cybertruck.
FSD V13.2.4
A new V13 build is now rolling out to the Cybertruck and is expected to arrive for the rest of the AI4 fleet soon. However, this build seems to be focused on bug fixes. There are no changes to the release notes for the Cybertruck with this release, and it’s unlikely to feature any changes when it arrives on other vehicles.
FSD V12.6.1 builds upon V12.6, which is the latest FSD version for HW3 vehicles. While FSD V12.6 was only released for the redesigned Model S and Model X with HW3, FSD V12.6.1 is adding support for the Model 3 and Model Y.
While this is only a bug-fix release for users coming from FSD V12.6, it includes massive improvements for anyone coming from an older FSD version. Two of the biggest changes are the new end-to-end highway stack that now utilizes FSD V12 for highway driving and a redesigned controller that allows FSD to drive “V13” smooth.
It also adds speed profiles, earlier lane changes, and more. You can read our in-depth look at all the changes in FSD V12.6.
Same Update, Multiple FSD Builds
What’s interesting about this software version is that it “includes" two FSD updates, V12.6.1 for HW3 and V13.2.4 for HW4 vehicles. While this is interesting, it’s less special when you understand what’s happening under the hood.
The vehicle’s firmware and Autopilot firmware are actually completely separate. While a vehicle downloading a firmware update may look like a singular process, it’s actually performing several functions during this period. First, it downloads the vehicle’s firmware. Upon unpacking the update, it’s instructed which Autopilot/FSD firmware should be downloaded.
While the FSD firmware is separate, the vehicle can’t download any FSD update. The FSD version is hard-coded in the vehicle’s firmware that was just downloaded. This helps Tesla keep the infotainment and Autopilot firmware tightly coupled, leading to fewer issues.
What we’re seeing here is that HW3 vehicles are being told to download one FSD version, while HW4 vehicles are being told to download a different version.
While this is the first time Tesla has had two FSD versions tied to the same vehicle software version, the process hasn’t actually changed, and what we’re seeing won’t lead to faster FSD updates or the ability to download FSD separately. What we’re seeing is the direct result of the divergence of HW3 and HW4.
While HW3/4 remained basically on the same FSD version until recently, it is now necessary to deploy different versions for the two platforms. We expect this to be the norm going forward, where HW3 will be on a much different version of FSD than HW4. While each update may not include two different FSD versions going forward, we may see it occasionally, depending on which features Autopilot is dependent on.
Thanks to Greentheonly for helping us understand what happened with this release and for the insight into Tesla’s processes.
