Musk Confirms Tesla Will Upgrade HW3 Vehicles for Free - If You Bought FSD

By Not a Tesla App Staff
Not a Tesla App

Tesla has been struggling to provide FSD updates for vehicles with Hardware 3 (HW3). What was once thought to be enough compute power to solve autonomy, is no longer able to handle the latest FSD updates.

Yesterday, Tesla finally confirmed that vehicles with HW3 will need to be upgraded to achieve Unsupervised FSD.

HW3 Upgrade Finally Confirmed

Musk had previously suggested that an upgrade might be necessary and Tesla would upgrade these vehicles if needed. However, during yesterday’s earnings call, Musk admitted that HW3 vehicles will, in fact, need to be upgraded. Tesla said that these upgrades will be performed free of charge for owners who have purchased the FSD package, leaving subscribers wondering what will happen to their cars.

Musk stated, “That's going to be painful and difficult, but we'll get it done. Now I'm kinda glad that not that many people bought the FSD package haha.” This appears to confirm that Tesla doesn’t plan on upgrading HW3 on vehicles that subscribe to FSD.

What About Subscription-Based FSD Owners?

While there are a lot of questions, one of the bigger ones is what happens to owners who have subscribed to FSD. Tesla didn’t touch on the topic, but if they’re not planning to upgrade HW3 subscribers, then they could potentially offer a paid retrofit. When the Model 3 was first released, it came standard with HW 2.5. At the time, Tesla said that you won’t need anything better unless you plan to buy FSD. Tesla ended up upgrading owners who had bought FSD for free, but non-FSD owners were required to pay for an upgrade.

Based on previous hardware upgrades—such as the HW2.5 to HW3 transition—a paid upgrade could cost between $1,000 to $3,000. However, it’s not clear what the upgrade to HW3 vehicles will be or how much it will cost even if a paid upgrade becomes available.

FSD on HW3

Musk also hinted that FSD was not selling as well as Tesla had hoped, which likely influenced the introduction of subscription-based FSD.

Meanwhile, Tesla continues to improve HW3-based FSD. FSD V12.6 offers major improvements in smoothness and is considered a baby V13 with notable improvements over V12.5.4.2. Reverse capabilities are also expected to arrive in a future release for HW3 vehicles, so Tesla hasn’t stopped development just yet. However, Musk was clear that HW3 will continue to lag behind HW4 releases moving forward.

FSD V14 and the Future of HW3

Tesla has stated that FSD V14 will be another significant step toward achieving Unsupervised FSD. The increasing complexity of FSD models and their growing context sizes mean that HW3 is already not able to run the larger FSD V13 models, but according to Tesla, V14 will increase the AI model even further, making it nearly impossible to run on HW3. As AI models become increasingly larger and AI5’s impending arrival approaches, one wonders how long before HW4 can’t run the latest models.

However, Tesla appears confident that HW4 will be sufficient, given its plans to launch FSD-powered robotaxis later this year.

What Will the HW3 Upgrade Look Like?

While Tesla has confirmed the HW3 upgrade, specific details remain unknown. We know that it won’t just be an upgrade to hardware 4 since that computer consumes more power than HW3’s electrical harness can provide, and it also has a different form factor, making retrofitting difficult.

Instead, Tesla will likely have to develop a new FSD hardware unit tailored for the retrofit or modify existing components to fit HW3-equipped vehicles. The hardware will need to be at least as computationally capable as HW4, but use the power of a HW3 unit.

Tesla has also said that it has no plans to replace cameras during the upgrade, despite HW3 cameras having significantly lower resolutions than HW4’s. While Tesla appears confident that this won’t be an issue, owners have reasons to be concerned as Tesla recently increased video processing resolution on HW4 cameras to improve FSD performance.

Tesla’s confirmation of an HW3 upgrade certainly makes more owners comfortable. However, the lack of details leaves subscribers and others wondering what will happen to their vehicles. It also doesn’t do much to ease the frustration of dealing with slower and less capable FSD releases, especially when they pay the same amount as HW4 owners, who receive more features and a smoother ride.

While free upgrades will be available for those who bought FSD outright, subscription-based owners are left in limbo, with no details on potential paid upgrade options.

With FSD V14 on the horizon and HW3 vehicles already struggling with the latest models, this upgrade will be crucial to keep existing owners happy.

Ordering a New Tesla?

Consider using our referral code (nuno84363) to get up to $1,000 off your new Tesla.

Tesla Intel Atom (MCU 2) and AMD Ryzen (MCU 3): Feature Differences and How to Tell What You Have

By Karan Singh
DirtyTesla

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
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 visualizations

Full-Screen FSD Visualization

⚠️ Only Available in North America

✅ Available in All Regions

Zoom Meetings

❌ Not Available

✅ Available

High Fidelity Park Assist

⚠️ Top-Down Visualization Only

✅ Full 3D Visualization

Autopark Visualizations (video)

⚠️ Top-Down Visualization Only

✅ 3D Visualization

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.

**Atari Games were removed from MCU 3 vehicles due to Emulator Licensing issues.

How to Tell - Intel or AMD

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.

Tesla Expected to Add Turn Signal Stalk Back to Model 3

By Karan Singh
Not a Tesla App

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?

Latest Tesla Update

Confirmed by Elon

Take a look at features that Elon Musk has said will be coming soon.

More Tesla News

Tesla Videos

Latest Tesla Update

Confirmed by Elon

Take a look at features that Elon Musk has said will be coming soon.

Subscribe

Subscribe to our weekly newsletter