Everyone loves receiving new updates for their Tesla. But do you know what the version numbers mean and why there are so many versions? We take a look at exactly what Tesla version numbers imply and how Tesla creates and branches their code.
What It Means
A recent Tesla update had version number 2021.32.201b7f33580a5f. Let’s take a look at how Tesla numbers their versions and what it means.
The first portion of the version number, 2021, is the year of the release. The second, 32, is the week number of the year. Since Tesla has a history of releasing a major update every four weeks, you’ll almost always see this number in increments of four. After the week number is the revision of the build.
The first build of a release usually does not have a revision and it’s simply known as 2021.32. This is the first build and is only rolled out to a very small portion of the Tesla fleet, if at all.
As Tesla gathers fleet data and learns about any issues, they’ll make improvements and fixes to the release. The next update will have a revision number, such as '.1'. Revision numbers go by incrementally, although not always by one. The number is often arbitrary, but it should reflect the amount of changes in the release. For example, going from 2021.32.1 to 2021.32.2 would often indicate a smaller change than jumping to 2021.32.20.
The revision number should be looked at as a single number and not as a decimal. For example, version 2021.32.2 is an earlier build of 2021.32.20.
Hash
The seemingly random numbers and letters you'll see at the end of a version number is a unique key called a hash that is used to identify that code. A hash is used every time new code is added to a code base and the ones we see in an update are used to identify that specific release.
Gradual Updates
Tesla will often start with a release such as 2021.32 and they’ll gradually roll it out to some vehicles, get data, make fixes and then roll out another release. By the time an update is in wide release, it likely has gone through various revisions and will have a higher revision number.
Tesla releases their updates gradually so that they can minimize any potential issues and keep everyone safe. If there are any major issues with a release, it likely only impacted a smaller portion of the fleet.
Cybertruck owners in northern areas - especially those in Canada, have noticed slower charging rates on some vehicles. These owners are experiencing low charging amperage even when using a 48-amp Wall Connectors.
The 4680 cell - the Cybercell, seems to be sensitive to temperature changes and, as such, loses the ability to charge or discharge rapidly. Tesla accommodates this by warming the battery in advance of driving or while driving. However, there seems to be a software issue preventing the battery pack from warming up properly.
In addition, other users have noted that they don’t have regen braking due to the battery not warming up properly, even after driving. If you drive other Tesla vehicles while they’re cold-soaked, they will eventually warm up to offer you full regen and full performance. The Cybertruck, interestingly, will offer you full performance at cold-soaked temperatures as low as -20C (-4F), but will have regen unavailable in temperatures as warm as -5C (41F).
Software Fix Confirmed
Brian Silver over on X reached out to Tesla Service with his findings, who confirmed that this is a known software issue that has now been validated. Tesla Service responded by saying that they’re hopeful a fix can be built into the 2025.2 software update. This is the first time we’re hearing about Tesla’s next major software update, which is expected to be released around the second or third week of 2025.
Tesla has also confirmed that this is not a physical issue with the heating system, so no repair is required for this one - it’ll be another OTA fix, just like many others.
We’re glad to see this one getting fixed so quickly. The issue appears to have started with the 2024 Holiday Update, or it could just be a coincidence since Cybertrucks begin to settle into Canada this year, where winters are much harsher and colder on average.
Workaround
We’re hoping to see this fix go out soon, as the current procedure to get around this is annoying. It requires you to set the navigation to a nearby Supercharger so that your vehicle will precondition the battery. You can stop the navigation to the Supercharger after 5-10 minutes, at which point the battery pack will be more than warm enough to charge at the full amperage of your home charger.
This workaround also resolves the issue of limited regenerative braking by warming up the battery pack sufficiently.
As part of Tesla’s Holiday Update, Tesla has introduced an awesome new feature - multi-vehicle synchronized Light Shows.
Now, you’re probably going to say: Wait! We’ve seen those kinds of light shows already.
And you’re not wrong - thanks to the hard work of people using the Light Show tool, you could synchronize light shows and run different shows on different vehicles. But this was a lot of manual, time-consuming work. Tesla now officially supports creating a light show involving up to eight vehicles.
Coordinated Shows
These new coordinated shows can be set up in the new xLights interface, making it far easier for Light Show designers to assemble everything. They’ll be able to edit and view multiple vehicles at the same time, synchronize them all together - and build variants with up to eight vehicles.
The output is still eight different Light Shows - which will still need to be put on USB flash drives and distributed to the correct vehicles in the correct order, but designers can now build a unified and coordinated light show. It could be possible to coordinate more than eight vehicles in a single Light Show - and we’re sure we’ll find out in the coming weeks what is possible with the updated xLights software.
Tesla showed off a great example below, putting together a jaw-dropping 8-vehicle Light Show using the new “Ready for Assault” show that arrived with the 2024 Holiday Update. Tesla has also gone ahead and contributed example Light Shows on Github to get Light Show designers familiar with the new process.
Tesla’s light show feature received a massive update with this year’s holiday update, but we’re only finding out about some of the features now. Here’s a quick rundown of everything new in Tesla’s Light Show feature:
Support the Off-road Lightbar for the Cybertruck
Start, Stop, or Schedule a Light Show from the Tesla app
Create longer Light Shows
Two new songs, including Cyber Symphony and Ready for Assault
Ability to control Ambient Lighting in 2024 Model 3 or Cybertruck
Display color effects on the vehicle’s center screen
Create Light Shows that involve up to eight vehicles
Cybertruck Lightbar Support
Another interesting addition is the recent support for the Cybertruck’s off-road lightbar. The off-road lightbar can be addressed in three zones - the forward main bar and left and right ditch beams. With the holiday update, Tesla also added the ability to program the vehicle’s ambient lighting, display color effects, and create longer light shows than ever before.
Tying everything together in this update is the ability to start, schedule, or stop a light show directly from the Tesla app.
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