Tesla is finally getting ready to release support for the Apple Watch and presumably Android wear devices. It’s anyone’s guess if development for smartwatches has been in the works or if the Tesla team found out at the same time as the rest of us. Despite this request being made several times before, Elon Musk recently responded to the request with a simple “Sure.” Although the response is short, Musk has a good record of delivering on items he has said “sure” or “okay” to on X/Twitter. A few examples are agreeing to add WiFi garage door support, a glovebox PIN feature, disabling mirror auto-dimming, and many others. When Musk responds to these requests, in all likelihood, they’re already on Tesla’s product roadmap.
The days of living in fear of your phone running out of juice and not having your key card may be numbered. X user @dani_elle831 described that exact situation: “well it finally happened. my phone died & I got locked out of my tesla thankfully the massage place let me use their phone & hubby unlocked it from his phone not sure why the car can’t be unlocked using an Apple Watch or other smart watch. any chance this could be incorporated @elonmusk?”
One of the big advantages Apple Watch and Android Wear support could bring is the ability to use your watch as a vehicle key. From the context of the post on X, it’s not clear whether this will be included, as the post simply talks about unlocking the vehicle when you don’t have a working phone on you. It could mean having full-fledge key support on your watch, or simply being able to unlock and start the vehicle over the internet like you can already do through the app when you’re outside of Bluetooth range.
There’s no doubt that having ‘phone key’ support would be the best option, as it would work seamlessly and not require an internet connection, although it’s not clear what Tesla’s intentions are. Tesla has not added support for Apple’s CarKey and is unlikely to add it at this point. However, Tesla could add phone key support in the same method they already support on iPhones and Android devices.
Phone key leverages Bluetooth to unlock the vehicle when it’s nearby, and Tesla recently added ultra-wideband support, which brings even more precision to phone key. However, ultra-wideband is only available on newer devices, such as the iPhone 11 and later, some Samsung Galaxy 21 devices and later, as well as select other models. It also required a new Model 3, Cybertruck, or a newer Model S or X, with these sensors built in. Unfortunately, the previous generation Model 3 and the current Model Y do not include ultra-wideband support.
It is interesting to note that the Apple Watch has had ultra-wideband support since the Series 6, including the new Ultra models. Hopefully, we’ll be in for a treat and will see full phone key support through Bluetooth and Ultra-wideband, but either way, it seems like we’ll at long last be able to unlock the vehicle from our smartwatches in some form.
From Widgets to Watch Support
Tesla added lock screen widgets to the iPhone back in 2022
Not a Tesla App
Tesla rolled out lock screen widget support on iPhones in app update 4.14, and we’re likely going to see these same lock screen widgets supported on the Apple Watch and possibly on Android Wear devices. Tesla has two lock screen widgets that display relevant vehicle information. The larger one displays the range left on the vehicle, the name of the vehicle and a progress bar showing the charge level. If you have more than one Tesla, you’ll need to choose which vehicle is displayed in the widget, however, you can have multiple instances of the same widget. There is also a smaller widget that is half the size and simply displays the vehicle’s state of charge. Both of these would adapt well to ‘complications’ on the Apple Watch..
Smartwatch Support Expectation
Another concept of a Tesla app on the Apple Watch by @niccruzpatane
@niccruzpatane
We don’t know what Tesla is developing and it could be anything from a full-fledged Tesla app for smartwatches that allows you to access most commands available in the Tesla app such as charging, unlocking, starting the climate, setting charge level (as shown in the concept above), and even include full phone key support. However, it could also be a slimmed-down app that introduces watch widgets and allows you to access the most important commands and information about the vehicle, such as seeing the vehicle’s range, unlocking it, and starting a charge. Smartwatch support has been a long time coming, and even if Tesla releases the latter, it will be a great addition.
Other Manufacturers
Tesla's development of smartwatch apps is a welcome step, but surprisingly a step behind the competition, which is unlike Tesla in terms of software. Companies like Porsche, BMW, Dodge, Toyota, and Ford have already introduced support for smartwatches. These apps offer a range of features such as remote engine start and stop, door lock and unlock, car finder, vehicle status, and parking meter assistance.
Timing is Everything
Tesla's consideration of a smartwatch app comes at an intriguing time, closely following Apple's announcement to cancel its electric vehicle project, which would’ve competed directly with Tesla. It’s likely a coincidence, and it could have more to do with the recent addition of ultra-wideband, as this new tech provides significant improvements in energy usage and precision. We should find out more soon, so stay tuned.
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Tesla vehicles are equipped with two main computer systems: the MCU (Media Control Unit), which is responsible for entertainment and display functions, and the Autopilot/FSD Unit, often referred to as the FSD Computer.
Both of these systems have evolved over the years, and they’re commonly referred to by their generation. For example, MCU 2 refers to the second generation of the Media Control Unit. Similarly, the FSD computer is identified by its generation, often called Hardware 3 or Hardware 4, when referring to the third and fourth-generation hardware. More recently, Tesla has started referring to the FSD Computer as AI3 and AI4, but you’ll still hear the older terms used interchangeably.
These two systems are separate and they’re not upgraded at the same time, meaning it’s possible to have a vehicle with MCU 2 and FSD Hardware 3 or MCU 3 with Hardware 3. Some vehicles even feature MCU 1 alongside Hardware 3.
The MCU is not involved with Autopilot or FSD functions—it’s purely for infotainment and in-vehicle features such as vehicle visualization, gaming, maps, and entertainment. It doesn’t impact the capabilities or limitations of Tesla’s autonomous driving systems.
MCU 1 - NVIDIA Tegra 3
MCU 1 was the first media control unit to be introduced in Tesla vehicles, starting back in 2012. This system was used in the Model S and Model X until about April 2018, when Tesla began transitioning to MCU 2.
By the time the Model 3 launched in late 2017, it already included MCU 2. To keep legacy vehicles up to date, Tesla offers an infotainment retrofit that upgrades MCU 1 to MCU 2, which helps make the infotainment unit much more responsive and adds a variety of newer features. Tesla continues to support vehicles with MCU 1, although upgrades are much further apart. In 2024, Tesla added Automatic Emergency Braking (AEB) improvements to vehicles with MCU 1 and even support for FSD V12.3.6 (FSD HW3 required).
Period Offered: 2012 through April 2018
Upgrade: Available as a paid upgrade for Model S and Model X vehicles to go from MCU 1 to MCU 2.
MCU 2 - Intel Atom
The launch of the Model 3 introduced MCU 2, which ran on Intel’s Atom mobile processor. While the Intel Atom was capable at the time, it’s now considered outdated compared to modern standards. As Tesla continues to roll out new features, the limitations of the Atom processor have become more apparent.
There is a notable list of features that are unavailable to vehicles with MCU 2. Although Tesla has optimized software to improve compatibility, not all features have been made accessible to these vehicles.
Period Offered: MCU 2 was offered in 2017 (Model 3) through 2022 (availability differs based on region and model).
Upgrade: As of now, Tesla has not offered an upgrade path or retrofit to transition from MCU 2 to MCU 3, and they’re unlikely to do so.
MCU 3 - AMD Ryzen
In December 2021, Tesla began shipping vehicles with MCU 3, powered by AMD’s Ryzen processor. The first vehicles to feature MCU 3 were the refreshed Model S and Model X, which debuted in 2021. Shortly after, Model 3s and Model Ys were also equipped with MCU 3, and today, all Tesla vehicles, including the Cybertruck, come standard with MCU 3.
This MCU is now the most widely used on the road and is Tesla’s most advanced infotainment processor. It supports impressive 3D visualizations, allows improved gaming on the center touchscreen (and rear screens in equipped vehicles), and offers a host of other capabilities. MCU 3 is also the most feature-complete version, with new features being designed for it first and then backported to MCU 2 or MCU 1 when possible.
Period Offered: The first MCU 3 vehicles were released in December 2021 and is current through today.
Upgrade: MCU 3 is the most current infotainment unit that Tesla offers.
Features Missing on MCU 2 (Intel Atom)
High-fidelity park assist is limited to vehicles with MCU 3
Not a Tesla App
While Tesla does its best to continue to support MCU 2, there is a growing difference between the features available on a vehicle with an Intel Atom infotainment unit and one with the AMD Ryzen processor.
Feature
MCU 2
MCU 3
Games / Arcade
⚠️ Limited Games*
✅ Additional Games**
Parked View
⚠️ Split screen visualization with vehicle on left and map on right
✅ Full-screen Parked Viz - Shadows, Sun Reflections, Shadows
Vehicle Visualizations
⚠️ Some limitations, such as non-transparent glass
Improved UI for Display Modules - Media, Next Turn, Trip Planner
⚠️ Solid Color/Semi-Transparent
✅ Transparency + Background Blur for Display Modules
*Many recent game additions are available to MCU 3 only, including the ever-popular Vampire Survivors and Castle Doombad. Only certain Model S and Model X vehicles include a GPU and the ability to play games on Steam.
Identifying which MCU your vehicle has is straightforward. Simply go to Vehicle Options > Software > Additional Vehicle Information.
In the interface, you’ll find details about whether your vehicle is equipped with an Intel Atom (MCU 2) or AMD Ryzen processor (MCU 3).
MCU 4?
It’s been more than three years since Tesla introduced the AMD Ryzen-powered MCU. Despite advancements, including the transition from FSD Hardware 3 to AI4—and eventually AI5—there’s been no indication of an MCU 4 on the horizon.
The Ryzen processor’s impressive capabilities make it a solid choice for infotainment, and it’s well-suited to serve until there’s another big leap in CPU performance.
While Tesla will upgrade to MCU 4 at some point, it doesn’t seem imminent. Some may argue that Tesla transitioned to MCU 3 too late, leaving vehicles just a few years old feeling outdated. It’s possible Tesla might choose to introduce MCU 4 ahead of the need for more processing power, ensuring that older vehicles can continue to benefit from new software features in the future.
Following the surprising return of the turn signal stalk on the refreshed Model Y, reliable Tesla source Chris Zheng has indicated that the Model 3 will also be receiving a turn stalk. While it initially seems surprising, Tesla mentioned that after receiving lots of customer feedback, there is a lot of demand for the return of the stalk.
For those who appreciate the newer turn signal buttons on vehicles like the Cybertruck, this might come as a surprise. However, the Model 3 and Model Y are designed for the average driver transitioning from a traditional vehicle, making the removal of the turn signal stalk an unexpected and potentially disappointing change.
Turn Stalk
In a conversation during the latest episode of Jay Leno’s Garage, Tesla’s VP of Vehicle Engineering, Lars Moravy, mentioned that Tesla works to remove superfluous parts. In this case, they removed one part too many - and are now bringing back the turn signal stalk.
The updated stalk on the refreshed Model Y is a simplified version of the current Model Y stalk. It doesn’t include multi-stage turn signals (short three flashes versus staying), buttons, or other features. Pure and simple - it is utilized for signaling left and right. The rest of the functions of a traditional stalk remain either on the wheel or on the screen.
Lack of Right ‘Shifter’ Stalk
Tesla has no intent to bring back the right stalk, which is traditionally used to shift the vehicle from Drive to Reverse and Park in Teslas. It’s also used to activate Autopilot. The shifting functionality will remain on-screen or available via the backup by tapping the buttons on the ceiling near the hazards button. Shifting via the dash is intuitive and convenient once you get used to it - and with AutoShift hopefully coming out of Beta sometime soon, this could get even better.
Autopilot activation will remain with a button on the steering wheel. While a vehicle with a single stalk may look a little odd at first, Lars mentioned that Tesla didn’t receive many complaints about shifting or Autopilot use.
Retrofit
Not a Tesla App
We haven’t heard anything about retrofitting the 2024+ Model 3s with the turn signal stalk at this point. However, we imagine this may be a possibility in the future.
However, we can recommend using the wireless Enhauto’s S3XY Stalks if you want to bring a single or dual stalks back to your refreshed Model 3 and don’t want to wait for an official retrofit to arrive. They’re easy to install, well-designed, and reliable.
Other Models
The big question now is: will Tesla bring back the turn signal stalk for its other models? It’s possible, but we doubt it. The Model S and Model X, especially with the Yoke, feel more natural without a stalk, and the button-based signals suit their design. While a stalk might occasionally be useful—like signaling in and out of a roundabout—any future refresh of the S or X would likely include steer-by-wire instead.
On the Cybertruck, the absence of a stalk goes unnoticed, thanks to steer-by-wire, as the squircle steering wheel is never in an awkward position. After thousands of kilometers of daily driving, including plenty of roundabouts, the author can confidently say the signal stalk isn’t missed at all. In fact, the turn signal buttons feel more intuitive, given how the Cybertruck handles.
That said, could Tesla offer signal stalks as an option for those who prefer them? It’s not out of the question. We’ll keep you updated, but in the meantime, let us know—do you prefer turn signal buttons or a traditional stalk?