Tesla has said that a car with its Hardware 3 computer (HW3) will not run Full Self-Driving (FSD) without a driver supervising. Not a Tesla App reported that on its first-quarter 2026 earnings call Tesla admitted “for the first time that Hardware 3 (HW3) will not be capable of Unsupervised Full Self-Driving.” Drive Tesla Canada’s report of the call has Elon Musk saying HW3 “simply does not have the capability to achieve FSD unsupervised.”
What HW3 owners have instead is a slimmed-down build called FSD v14 Lite. It reached early-access drivers on June 29, 2026 and went out widely to HW3 Model 3 and Model Y cars in the United States and Canada from July 21. They also have a promise, made to owners who bought FSD: a hardware upgrade, or a discount on a trade-in. The reports cited here, the latest from September 2026, carry no date, price or booking process from Tesla for either one. This page lays out what is settled, what is promised and what is still a guess.
This site’s reference car is a 2019 Model 3 on HW3, so this is the page it keeps for itself. If you are not sure which computer your car has, the HW3 or HW4 checker shows how to tell in 30 seconds.
The short answer
| Question | Where it stands in the reports cited here |
|---|---|
| Will HW3 ever run unsupervised FSD? | No, per Tesla’s first-quarter 2026 earnings call as reported by Not a Tesla App |
| What does an HW3 car run now? | FSD v14 Lite builds, under driver supervision: Model 3 and Model Y in the US and Canada since July, and a small number of HW3 Model S and Model X from late September |
| Is HW3 still getting FSD updates? | Yes: v14.1 Lite in August and v14.2 Lite in September, though Not a Tesla App calls v14 “the end of the line for HW3 vehicles” |
| Is there a retrofit? | Promised for owners who bought FSD; no date, price or booking process from Tesla |
| Is there a trade-in offer? | Promised to owners who bought FSD, as a discount toward a new car; Tesla gave no amount |
| What if you subscribe to FSD, or never had it? | Not a Tesla App expects a paid upgrade to be offered later; that is the outlet’s expectation, not a Tesla offer |
| Should you buy an HW3 car? | Fine if FSD does not matter to you; buy HW4 if it does, knowing that no customer Tesla drives unsupervised yet |
What Tesla said about HW3 in 2026
For years the message ran the other way. Not a Tesla App’s summary: Tesla “maintained that every vehicle produced since 2019 possessed all the necessary hardware to eventually achieve full, unsupervised autonomy.” On the first-quarter 2026 earnings call, the same report says, Tesla “officially reversed course”. Not every outlet heard it as new: Drive Tesla Canada wrote that “Tesla has addressed this before, so the answer was unsurprisingly, no.”
The reason given is hardware. Drive Tesla Canada reported Musk “confirming that the memory bandwidth of HW3 is the biggest obstacle”. Outlets put the gap two ways: Electrek says the chip “has roughly one-eighth the memory bandwidth of HW4,” and Not a Tesla App says “about 15%.” The cameras are part of it too: Not a Tesla App’s April report says the hardware “lacks the compute power and camera resolution” needed. Each HW3 camera has a maximum resolution of 1280 by 960 pixels, or 1.2 megapixels, and Not a Tesla App puts the newer cameras at 5 megapixels.
Tesla’s own support page describes every customer car the same way for now: “All Tesla vehicles require active driver supervision and are not autonomous.”
What HW3 cars run now: FSD v14 Lite
Before the Lite builds, Tesla Oracle wrote, HW3 owners “were stuck on subversions of FSD v12 for more than a year.” Here is how that ended, by date.
| Date (2026) | What shipped | Who got it |
|---|---|---|
| June 29 | FSD v14 Lite, firmware 2026.20.5.1 | Early-access drivers first |
| July 21 | FSD v14 Lite, firmware 2026.20.6.11 | HW3 Model 3 and Model Y in the United States and Canada: “a very limited number” of cars on the first day, larger waves by July 23, and about 10% of that HW3 fleet when Tesla Oracle wrote |
| August | FSD v14.1 Lite | HW3 cars; in mid-September Tesla Oracle said its firmware was still “the most widely distributed among HW3 Teslas” |
| September | FSD v14.2 Lite, firmware 2026.27.6 | HW3 cars, slowly: a Tesla Oracle correction, citing tracker data updated September 16, said it had “not yet entered wide release” |
| September 23 (report date) | FSD v14.2 Lite, firmware 2026.27.10 and 2026.27.11 | HW3 Model S and Model X “for the first time,” in a “very small” number of cars; redesigned cars only, with older ones “still waiting” |
What it is. Tesla’s AI chief Ashok Elluswamy described the first build this way, in a post Electrek quoted: “This build distills the driving behavior from AI4’s v14 series into both the camera and compute config of AI3.” AI3 and AI4 are Tesla’s own names for HW3 and HW4.
What it added. Not a Tesla App says HW3 cars received, for the first time, features such as “Start from Park, parking at destination, shifting between drive and reverse, reversing and speed profiles on city streets.”
What it is not. Electrek’s description: “it remains a supervised, hands-on Level 2 system.” Level 2 means the driver is responsible at all times. HW4 cars are also ahead on features: Not a Tesla App notes that Automatic Collision Evasion, introduced with FSD v14.3.9, “is not available in the Lite version.”
Where it works. The only regional detail in the reports cited here is from July. Tesla Oracle wrote then that Tesla was “currently only rolling out” the Lite update to HW3 customer cars “in the United States and Canada,” and that “It looks like Tesla HW3 car owners in Europe will have to wait for the FSD v14 Lite update a bit more”. Electrek expected other markets to follow: “FSD v14 has already launched in Europe and Australia, so HW3 owners in those markets are expected to follow.” The later reports do not say whether they have.
One reported problem. Not a Tesla App wrote in August 2026 of “reports of HW3 computers overheating on FSD v14 Lite.”
To use any of it you need FSD on the car. Tesla’s support page says FSD (Supervised) “is not available for outright purchase and is only available as a subscription,” at $99 a month on its US page, read October 13, 2026. A car whose earlier owner bought FSD is a separate case, covered in the Autopilot vs FSD guide.
Version numbers will age fast. Within the v14 line the pattern has held: HW4 gets the full build first, and HW3 gets a smaller one later. Not a Tesla App calls v14 “the end of the line for HW3 vehicles,” so do not count on that pattern beyond it.
The retrofit Tesla has promised
The promise is older than 2026. Not a Tesla App’s July 2025 summary says Musk “confirmed at the Q4 2024 Earnings Call that Tesla will upgrade HW3 computers for customers who purchased the FSD package,” and quotes him: “That’s going to be painful and difficult, but we’ll get it done.”
What changed in April 2026 is the size of the job. In 2025, the same outlet reported, Tesla’s position was that the existing cameras were “capable” and that “cameras would not be upgraded in HW3 vehicles.” After the first-quarter 2026 call, it reported that “Tesla also stated for the first time that cameras will need to be updated,” and described the job in its own words: it “will require new cameras, an updated vehicle computer, and an extensive overhaul of the internal wiring harnesses to support the increased data bandwidth.” Drive Tesla Canada’s report of the same call mentions the cameras and “a more powerful Autopilot computer,” and does not mention wiring.
Where the work would happen. Mostly not at your service center, by these accounts. Not a Tesla App says Tesla “plans to establish bespoke conversion facilities located in major urban hubs”. Drive Tesla Canada’s report calls them “microfactories,” has Musk describing them as an alternative to “relying solely on its existing Service Centre network,” and adds its own caution about the plan: “But that is a big if.”
Which computer. Tesla announced a new AI4+ computer on the same call. Not a Tesla App says it “could potentially be the hardware that makes its way to HW3 vehicles” and that “it’s not expected to enter production until mid-2027.” That is the outlet’s reading, not a Tesla commitment.
Who is first. Owners who bought FSD outright. The April report says Tesla “is prioritizing owners who already paid for the FSD software suite.”
What Tesla has not said. The reports cited here, through September 2026, give no start date, no price and no way to book. Tesla’s support page for computer upgrades, read on October 13, 2026, covers only the older step up to “Full Self-Driving computer 3.0” and does not mention an HW3 retrofit. In August 2026, Not a Tesla App summarized Tesla’s position this way: “an upgrade doesn’t make sense right now until Tesla can solve autonomy and knows the hardware required to achieve it.”
One developer has done a partial do-it-yourself retrofit. In August 2026, Not a Tesla App reported, a developer fitted an HW4 computer to a 2022 Model 3. The developer said the swap needed “some light ECU hacking,” that the camera cables could stay (“No need to cut and replace anything”), and that the job was not finished: “still a bit of stuff left to get all the features.” ECU stands for electronic control unit, one of the car’s computers. That cuts against the wiring overhaul described above, and it is one car. The same report notes there is “no official retrofit program in place.” This site’s view is that it is not a route for most owners.
The trade-in alternative
For owners who bought FSD and would rather not have the car taken apart, the April report says they “will have the option to accept a special discount on the trade-in of their vehicle, which will go toward the purchase of a brand-new AI4-equipped vehicle.”
Two things are missing:
- The amount. Tesla “didn’t go into further detail about the discount.” Not a Tesla App guessed “about a $4-$6k discount,” and said so: “We’d expect.” Treat any dollar figure you see as a guess until Tesla publishes one.
- What happens to the FSD you paid for. Drive Tesla Canada called it “the one big detail missing”: “whether HW3 owners will be able to transfer their FSD license to the new car, or if they will be forced to abandon it and subscribe to FSD on a monthly basis.” Tesla’s general rule today is no transfer. Its support page answers that question with a plain no and adds: “The Full Self-Driving (Supervised) Transfer Program ended on March 31, 2026.” Tesla has not said whether the HW3 trade-in will be an exception.
What to do if you own an HW3 car
It depends on how you have FSD.
| Your situation | What you have now | What Tesla has promised | What is not known |
|---|---|---|---|
| You bought FSD outright | FSD v14 Lite, supervised, where it has rolled out | A hardware upgrade, with FSD buyers first, or a trade-in discount | When, where, and whether purchased FSD moves to a new car; Tesla’s support page says FSD does not transfer |
| You subscribe to FSD | FSD v14 Lite, where it has rolled out, while you pay $99 a month (US price) | Nothing specific; Not a Tesla App expects a paid upgrade later | Whether it happens, and the price. The outlet’s guess is “the $3,000 to $5,000 range” |
| You do not have FSD | Whatever the car came with; see the Autopilot vs FSD guide | Nothing | The same as for subscribers |
Practical steps while you wait:
- Do not pay anyone for a retrofit place in line. As of the August 2026 report cited here there was “no official retrofit program in place,” and Tesla’s support page showed none on October 13.
- If you bought FSD, keep the paperwork. Tesla’s promise is tied to having purchased it. This site’s suggestion is to save the purchase agreement or invoice; the car’s software screen shows that FSD is on the car, not how it was acquired.
- Do not sell early on the strength of a guessed discount. Tesla had given no amount as of the reports cited here.
- Check for the Lite build. If your HW3 Model 3 or Model Y has FSD and is in the US or Canada, v14 Lite has been going out since July 2026. For an HW3 Model S or Model X, the first Lite build began reaching a small number of redesigned cars in late September.
For everything else about living with the car, start at the Tesla owner’s guide.
If you are shopping for a used Tesla
If FSD is part of why you want the car, buy one with HW4 and confirm it on the touchscreen before you pay. Tesla has said HW3 will not run unsupervised FSD, and the upgrade it promised has no date. HW4 gets the full supervised builds and the newer features; it does not drive unsupervised either. One more unknown for shoppers: the promise is worded for owners who purchased FSD, and none of the reports cited here says whether it follows a used car to its next owner. If FSD does not matter to you, the computer is a small part of the decision. The HW3 or HW4 guide lists which models and years have which computer, and the used Tesla buying guide covers what transfers with the car.
Frequently asked questions
Can HW3 run FSD?
Yes, under supervision. In the United States and Canada, HW3 Model 3 and Model Y cars have run the Lite builds of FSD v14 since July 2026, and HW3 Model S and Model X began getting one in late September. Tesla has said HW3 will not run unsupervised FSD.
Will Tesla upgrade HW3 for free?
Tesla has promised an upgrade to owners who bought FSD, and the 2025 reporting described it as complimentary for them. The reports cited here include no published terms. For everyone else, Not a Tesla App expects a paid option.
When will the HW3 retrofit start?
Tesla had not given a date as of the reports cited here. The one timing detail in the April 2026 report is about a part that might be used: the AI4+ computer, which Not a Tesla App says “could potentially be” the retrofit hardware, is “not expected to enter production until mid-2027.”
How much will the HW3 retrofit cost?
Tesla had not said as of the reports cited here. Not a Tesla App’s estimate for owners paying out of pocket is “the $3,000 to $5,000 range,” which is the outlet’s guess.
Does FSD v14 Lite work in Europe?
Not as of the one July 2026 report cited here that addresses it. Tesla Oracle wrote that it “looks like” HW3 owners in Europe “will have to wait for the FSD v14 Lite update a bit more”. The later reports do not say whether that has changed.
Is HW3 still getting updates?
Yes. FSD v14.1 Lite arrived in August 2026 and v14.2 Lite in September. Not a Tesla App describes v14 as the last FSD branch for HW3, while noting that Tesla “still continues to update the v14 branch with fixes and better driving behaviors.”
Sources (11)
- notateslaapp.com Not a Tesla App (Apr 24, 2026): Tesla Announces HW3 Upgrade Plan, Trade-In Discount, No Unsupervised FSD for HW3
- driveteslacanada.ca Tesla shares more details on HW3 upgrade path
- electrek.co Electrek (Jun 29, 2026): Tesla starts FSD v14 Lite rollout to HW3 cars
- teslaoracle.com Tesla Oracle (Jul 23, 2026): FSD v14 Lite goes wide release with 2026.20.6.11
- teslaoracle.com Tesla Oracle (Sep 15, 2026): FSD v14.2 Lite rollout status
- notateslaapp.com Not a Tesla App (Sep 23, 2026): Tesla Starts Rolling Out FSD v14.2 Lite to HW3 Model S and Model X
- notateslaapp.com Not a Tesla App (Jul 8, 2025): Tesla's HW3 Upgrade, What Tesla Has Announced and What to Expect
- notateslaapp.com Not a Tesla App (Aug 21, 2026): Tesla Owner Successfully Upgrades HW3 Model 3 to HW4
- tesla.com Tesla Support: AI Computer Installations
- tesla.com Tesla Support: Full Self-Driving (Supervised)
- en.wikipedia.org Wikipedia: Tesla Autopilot hardware
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