Is Your Tesla HW3 or HW4? How to Check, by Model and Year

The short answer

• Tesla’s support site gives the check in its own words: “Select ‘Controls’ > ‘Software’ and confirm AI computer type. Then press ‘Additional Vehicle Information.’” If you are sitting in the car, that is the whole job.
• Without the car, the build date does most of the work. Hardware 3 (HW3), the Full Self-Driving (FSD) computer, went into all new Model S and Model X cars “around March 20th” 2019 and all new Model 3s “around April 12th” 2019. Hardware 4 (HW4) was reported in a customer’s Model X built on February 25, 2023, showed up in Model Ys from Tesla’s Fremont, California factory in late May 2023, and came to the Model 3 with the restyled 2024 car in North America.
• From outside, look at the cameras. Not a Tesla App’s tell: HW4 “has cameras with red lenses,” and “the easiest place to see this is on the front cameras.”
• Why it matters: Not a Tesla App reported that on its first-quarter 2026 earnings call Tesla admitted HW3 “will not be capable of Unsupervised Full Self-Driving.” HW3 cars with FSD in the United States and Canada now get a slimmed-down build of it, covered below.

One naming note before the table. Tesla’s support page, read October 13, 2026, uses the term “AI computer.” Not a Tesla App wrote in 2025 that “Tesla has started referring to the FSD Computer as AI3 and AI4,” and several sites cited here use those names. AI3 is HW3 and AI4 is HW4.

HW3 or HW4, by model and year

Read the dates as “around,” because that is how they were reported. Tesla did not announce the HW4 change; CleanTechnica wrote at the time that “there has been no announcement about the change in hardware by the company,” and the HW4 dates in the table for the Model S, Model X and Model Y come from owner reports and trade sites, not from a Tesla announcement. The HW3 dates are firmer, since Tesla gave them itself, though Wikipedia and AutoPilot Review round the start to April or April and May 2019. For any one car, the screen check below beats the table.

How to check your own Tesla in 30 seconds

Tesla’s support page answers the question “How can I confirm my current computer configuration?” this way: “Check your configuration from your touchscreen. Select ‘Controls’ > ‘Software’ and confirm AI computer type. Then press ‘Additional Vehicle Information.’”

That second screen arrived with a 2020 software update. The electric-car dealer Current Automotive described it when it arrived: the 2020.4.1 software update added an Additional Vehicle Information screen, “visible from the software menu on all Teslas.” At the time, the dealer wrote, the line read 1.0, 2.0 or 2.5 on older cars and “Full Self-Driving Computer” on 3.0 cars.

The two guides cited here describe that line differently. Current Automotive’s 2020 post has the computer listed there from the start. Not a Tesla App reports that “as of software update 2024.38, Tesla has added the ability to view the vehicle’s hardware version,” on a line labeled “Autopilot computer,” where “you’ll likely see version 2.5, 3 or 4.” Tesla’s support page, read October 13, 2026, tells you to “confirm AI computer type.” Per Not a Tesla App’s 2024 guide, a 3 is HW3 and a 4 is HW4; in Current Automotive’s 2020 description, an HW3 car showed “Full Self-Driving Computer” with no number.

If you are buying used and cannot sit in the car, ask the seller for a photo of that screen. It settles the question for that exact car, which no table can.

How to tell HW3 from HW4 without getting in the car

Look at the cameras first. Not a Tesla App’s description is the clearest: “HW4/AI4 has cameras with red lenses – the easiest place to see this is on the front cameras – where there will be 2 red lenses and one black (fake) lens.” An HW3 car has three working cameras behind the windshield; the newer hardware “got rid of the 3rd front-facing camera since the cameras now have a higher resolution.” The side repeater cameras, on the front fenders, changed too: per Not a Tesla App they carry “the same red tint, but include a smaller and narrower turn indicator.”

Then read the VIN for the model year. Under a US federal rule, the tenth character of a Vehicle Identification Number (VIN) is the model year: K is 2019, L is 2020, M is 2021, N is 2022, P is 2023, R is 2024, S is 2025 and T is 2026. For a Model 3 it narrows things down, but the dividing line is the restyled car, not the letter: Not a Tesla App’s wording is “The updated 2024 Model 3 has HW4.” Confirm the car is the restyled one, or check the screen. For a Model Y, S or X with a P in the tenth position, it is not enough: 2023 is the year the hardware changed mid-run, so a P car can be either.

The federal rule’s list of what a VIN encodes does not include the computer. For a split-year car, treat any VIN lookup tool’s answer as an estimate; the Additional Vehicle Information screen is the check for one specific car.

Is a 2023 Tesla HW3 or HW4?

It depends on the model, and for the Model Y, Model S and Model X it also depends on the month.

2023 Model 3: HW3 in North America. Not a Tesla App puts it in one sentence: “The updated 2024 Model 3 has HW4, but if you have a 2017-2023 Model 3, you’ll have Hardware 3.” (The early part of that range needs a footnote, covered in the next section.) The restyled car, often called Highland, opened for North American orders on January 9, 2024, with Electrek reporting deliveries “within a month.” Outside North America the restyled car arrived earlier: Electrek wrote that since the summer of 2023 it had been “only being built at Gigafactory Shanghai and distributed in Europe, Asia, and the Pacific.” The sources cited here do not say which computer those early restyled cars had, so outside North America check the screen.

2023 Model Y: either. Teslarati reported that Tesla “has evidently started shipping some Model Y units from its Fremont, California factory with Hardware 4,” in a report published May 25, 2023, with photos of the cars spotted in California. Note the word some. CleanTechnica added that “so far as anyone knows, the new hardware is only being installed in cars manufactured in Fremont,” and inferred that, for the time being, Canadian buyers receiving Model Ys made in China “will not be getting the hardware update.” Not a Tesla App’s later guide puts the change, by delivery date, “after late May 2023 for vehicles made in the United States.” So a US-built Model Y delivered in the first months of 2023 should be an HW3 car, and one built late in the year is probably HW4. The first reports named Fremont only, while Not a Tesla App’s date covers cars made anywhere in the United States, so for a Texas-built car the screen is the safer check. The sources cited here give no date for Model Ys built outside the US, so those need the camera look or the screen.

2023 Model S and Model X: probably HW4, with an early-year gray zone. One early customer car was a Model X that, per its owner’s post as relayed by Not a Tesla App, “was built on February 25th and delivered March 5th.” Teslarati reported that a Tesla technician showed the owner the car was equipped with “AP4.” Not a Tesla App’s later guide says you will “likely have AI4 if you purchased after March 2023,” while Wikipedia’s hardware table dates HW4’s first availability to January 2023 (its text says shipping started then “with the refreshed Model S and Model Y,” which the 2023 reports on the Model Y contradict). Those do not line up to the month, and one is a purchase date while the others are build or availability dates, so treat any S or X from the first quarter of 2023 as unknown until you see the screen.

One oddity if you are looking at an early HW4 car: that Model X did “not show any details confirming it has HW4 in any of the usual places such as the software tab, in the ‘additional vehicle information’ dialog,” and its owner said Tesla confirmed it. Not a Tesla App says software since 2024.38 shows the version.

What is the oldest Tesla with HW3?

From the factory, a Model S or Model X built from about March 20, 2019, or a Model 3 built from about April 12, 2019. Those are the dates Tesla clarified on its Autonomy Day, April 22, 2019, as Electrek reported them: the new computer “was in all new Model S and Model X since March (start around March 20th) and in all new Model 3 vehicles earlier this month (starting around April 12th).” Tesla had confirmed production nearly three weeks earlier, on April 3, saying its “FSD computer” was “currently in production.”

Older cars can have HW3 too, because Tesla retrofitted it. Cars built after October 2016 carried Hardware 2, and Tesla announced version 2.5 in August 2017. The HW3 board is the same physical size as the 2.5 board, which makes a swap possible. Tesla’s US support page, read October 13, 2026, still carries the offer: “If you purchased Full Self-Driving (Supervised) and have computer 2.0 or 2.5, you are eligible for a complimentary upgrade to Full Self-Driving computer 3.0.” FSD subscribers do not get it free; the page says they “may be eligible to upgrade for $1,000.00 plus applicable tax, including installation,” and that the work “will typically take about an hour to complete but may take longer depending on your configuration.”

So a 2018 Model 3 can be an HW3 car if a previous owner had the upgrade done (free with purchased FSD; subscribers “may be eligible” for a $1,000 upgrade plus tax), and a 2018 car whose owner never did is still on the older computer. That is one more reason the screen beats the calendar.

What is the difference between HW3 and HW4?

Mostly cameras and computing headroom.

Each HW3 camera tops out at 1280x960, or 1.2 megapixels. Not a Tesla App says the red tint on the newer lenses “ensures better performance in low-light conditions.” Lane centering, the feature Tesla called Autosteer, is a separate question from the computer. In January 2026, Not a Tesla App reported that Tesla had “officially discontinued Autopilot for new vehicle orders in the United States and Canada,” and added that the “Model S and Model X are not as impacted.” The Autopilot vs FSD guide covers what is known about which cars still have it without a subscription. The computer matters mainly for one thing: which version of FSD the car can run.

Is your Tesla Intel Atom or AMD Ryzen?

The same screen answers a second hardware question that is easy to mix up with the first. Besides the driver-assistance computer, a Tesla has a media computer that runs the touchscreen, and Tesla’s Grok support page says where to see it: “Select ‘Controls’ > ‘Software’ > ‘Additional Vehicle Information’ to view your vehicle’s infotainment processor.” Not a Tesla App calls that computer the MCU, short for Media Control Unit, and writes that the two systems “are separate and they’re not upgraded at the same time,” so a car can pair the older Intel Atom media computer with HW3, or the newer AMD Ryzen one with HW3. In the same guide’s words, the media computer “is not involved with Autopilot or FSD functions.” Knowing a car is HW3 does not tell you which chip runs its screen.

Which cars have which. The dates come from trade sites, not from a Tesla support page. Not a Tesla App’s February 2025 guide says the Intel unit “was offered in 2017 (Model 3) through 2022 (availability differs based on region and model),” that the first cars with the AMD unit were “the refreshed Model S and Model X, which debuted in 2021,” and that the Model 3 and Model Y followed shortly after. Electrek reported on December 28, 2021, that Tesla had “started production of the Model 3 and Model Y with those changes in the US,” the AMD chip among them; the same report described that chip as already “powering the media computer in the new Model S and Model X and the Model Y Performance made in China.” Put together: a US-built Model 3 or Model Y from before late December 2021 should have the Intel chip, a car from the 2022 model year can have either, and a car built after 2022, every HW4 car included, should have the AMD one. The oldest Model S and Model X, built until about April 2018, started on an earlier Nvidia media computer, and Tesla’s paid infotainment retrofit moves those cars to the Intel unit. The frozen-screen guide covers those cars.

What depends on it. More each year, mostly on the screen:

• Grok, the voice assistant. Tesla’s support page, read October 14, 2026, lists “An AMD processor” among the requirements, and says Grok “may become available for additional Tesla vehicles with over-the-air software updates in the future.”
• The 24-hour dashcam buffer. Not a Tesla App lists “Hardware 3 (HW3) or higher with an AMD Ryzen infotainment unit” among its requirements, along with software 2026.14 or later and a drive of 1 TB or more. The same write-up says the door-pillar cameras record “on AMD-powered vehicles.” The dashcam USB drive guide covers the drives.
• The newer car pictures on the screen. Not a Tesla App wrote of the spring 2026 update that the higher-quality parked-car visuals “are exclusive to AMD-powered vehicles.” Its release-notes page for update 2026.38, released September 30, 2026, tags a “Visual Updates” note for Model 3 and Model Y cars with the AMD chip and HW3; the note reads: “The center display now features higher quality images of your Tesla, and an enhanced park scene environment.” That is a case where both answers on the screen matter.

Intel cars still get updates; the same spring report lists features coming to them in that update, such as the rename of Dog Mode to Pet Mode. What they have not been offered is a new chip: Not a Tesla App’s 2025 guide said Tesla “has not offered an upgrade path or retrofit to transition from MCU 2 to MCU 3, and they’re unlikely to do so.” If the screen features matter to you, check this line before you buy, as you would the computer line.

Is HW3 bad? What each computer gets in 2026

HW3 is not broken, and it is still getting updates. It is now the second tier.

Per Not a Tesla App’s account of the first-quarter 2026 earnings call, Tesla admitted “for the first time that Hardware 3 (HW3) will not be capable of Unsupervised Full Self-Driving,” because, in the site’s words, the hardware “lacks the compute power and camera resolution required to operate safely without a human in the driver’s seat.” Tesla’s own support page, read October 13, 2026, described every car the same way: “All Tesla vehicles require active driver supervision and are not autonomous.”

What HW3 cars do get is a slimmed-down build called FSD v14 Lite. Tesla Oracle reported that HW3 owners in the United States and Canada “started getting the FSD v14 Lite (2026.20.6.11) update on Tuesday, July 21,” 2026, and that it “looks like” HW3 owners in Europe “will have to wait for the FSD v14 Lite update a bit more.” Before the Lite builds, the same site wrote, HW3 owners had been on versions of FSD v12 “for more than a year.” By mid-September 2026 Tesla was pushing v14.2 Lite to HW3 cars while HW4 cars were getting FSD v14.3.9, and a Tesla Oracle correction, citing tracker data updated September 16, said the v14.2 Lite build had “not yet entered wide release.” By October, Not a Tesla App’s release-notes page listed update 2026.38.5 as carrying “FSD Supervised 14.3 Lite & 14.3.12,” the Lite build for HW3 and the full one for HW4. Those version numbers will age fast. Within the v14 line, HW4 runs the full build and HW3 a smaller Lite one, and the recent Lite builds have shipped on the same firmware version as an HW4 release.

Can an HW3 Tesla get a free FSD trial?

Tesla’s referral rules don’t name HW3, either to include it or to leave it out. The FSD referral terms, effective October 29, 2026, give a one-month trial on “an eligible vehicle, subject to these Terms and Conditions and vehicle eligibility (including applicable hardware and firmware requirements).” Tesla’s support page puts the same filter as one line: “Be eligible to subscribe to FSD (Supervised) with compatible hardware.” Neither page says which computers count.

So the test is whether your car can subscribe. Tesla’s subscription page says to open the Tesla app, tap Upgrades, then Software Upgrades: “If you are eligible, you will see an option to subscribe to FSD (Supervised).” It adds a note: “Depending on your vehicle configuration and hardware, a pre-requisite upgrade may be required for an additional cost before you can subscribe to FSD (Supervised).” If the app shows the subscribe option, your car meets one of Tesla’s conditions. Tesla doesn’t say which computers count, and its terms also mention firmware requirements.

The main other rules in Tesla’s legal terms apply to every car. Your Tesla account’s registration address has to be in a market where Tesla runs the program, and you must be at least 18 and the registered owner or lessee. The car can’t already have FSD by subscription or outright purchase, and you can’t have subscribed to FSD or redeemed any FSD trial in the past 12 months, including one Tesla gave you at or around delivery. Tesla for Business customers, current Tesla employees and anyone given a complimentary one-year FSD grant are out, and only primary account holders can redeem benefits. Tesla’s support page is stricter in two places. It lists “Have not purchased FSD (Supervised) outright,” with no mention of which car, and says that after a new-car trial you can’t receive a referral link “for at least 12 months after your trial is complete.” In the United States and Canada, HW3 cars with FSD run the Lite builds of FSD v14 covered above, so a month on an HW3 car is a month of the Lite build, not the full one HW4 cars get.

Tesla’s own promotions have not always included HW3. Notebookcheck reported in November 2025 that Tesla’s 30-day holiday trial went to HW4 cars running FSD 14.2 or later in North America and Puerto Rico, and left HW3 cars out. The referral month is a separate program with its own terms. The Tesla FSD free trial guide covers how to claim it, why a link can run out, and what happens when the month ends.

Can you upgrade a Tesla from HW3 to HW4?

Not yet. Tesla has promised an upgrade and, in the sources read for this page on October 13, 2026, had given no date for it; its support page that day described only the older upgrade to computer 3.0. Tesla’s third-quarter 2026 earnings call, held October 21, 2026, did not mention HW3 or an upgrade for it, going by the Motley Fool’s transcript. For years the answer was a flat no. Not a Tesla App’s 2024 guide said a retrofit “isn’t feasible” because HW4 uses “an entirely new wiring and cooling harness.”

The promise came in two steps. AutoPilot Review writes that on the January 29, 2025 earnings call Elon Musk said Tesla, in the site’s paraphrase, “will provide updates from HW3 (AI3) to HW4 (AI4) to those customers who purchased FSD.” On the first-quarter 2026 call, as Not a Tesla App reported it, Tesla said it “will eventually offer a massive hardware upgrade to owners who previously purchased the Full Self-Driving package,” one that, in the site’s account, “will require new cameras, an updated vehicle computer, and an extensive overhaul of the internal wiring harnesses.” For owners who purchased FSD and would rather not have that work done, the report says they “will have the option to accept a special discount on the trade-in of their vehicle” toward a new car, though Tesla “didn’t go into further detail about the discount.” That report carried no customer dates, prices or booking process from Tesla. The one timing detail was about hardware: a new AI4+ computer that is “not expected to enter production until mid-2027,” which the site says “could potentially be the hardware that makes its way to HW3 vehicles.” Treat any dollar figure you see quoted as a guess. The HW3 owner’s guide tracks the retrofit and trade-in terms as Tesla fills them in.

Does it matter which one you buy?

It matters in proportion to how much you care about FSD.

If you will never pay for FSD, the number on that screen is a small part of the decision. The computer’s job is driver assistance, and other things that vary by year, such as whether the car has a heat pump, follow their own dates. For that buyer, a well-priced HW3 car can still make sense. One newer feature does skip it: in Not a Tesla App’s table of the spring 2026 update, the Self-Driving app is marked “Yes (HW4)” for AMD cars, and Intel cars don’t get it. For a Model 3, the year-by-year page covers what else changed with each model year and what each year costs used.

If FSD is part of why you want a Tesla, buy HW4 and confirm it on the screen before money changes hands. Tesla said on its first-quarter 2026 earnings call, as Not a Tesla App reported it, that HW3 will not run unsupervised FSD, and the upgrade it promised puts owners who bought the FSD package outright first in line, with no date attached; Not a Tesla App expects a paid option for everyone else to come later. New buyers generally can’t join that group: Tesla’s US support page, read October 13, 2026, said FSD “is not available for outright purchase and is only available as a subscription.” Tesla’s referral terms do count one route as an outright purchase: FSD “included with the purchase of a Tesla vehicle via an applicable package (e.g., Luxe / Tech packages).” A used car can still carry a purchase, since the same support page said that if “the previous owner purchased FSD (Supervised) outright and did not transfer it to a new vehicle, you will receive the vehicle with FSD (Supervised).” Whether a package car, or a used car’s next owner, counts as a purchaser for the promised upgrade is not stated in the sources cited here. The used-car section of the Autopilot vs FSD guide covers when a previous owner’s purchase stays with the car. For a Model Y, S or X from 2023, do not trust the listing’s model year: look for the red lenses, then ask for the screen photo.

Shopping new for FSD instead? AutoPilot Review wrote that Tesla had “almost completely integrated the new hardware throughout its entire lineup,” and Not a Tesla App describes a “brand-new AI4-equipped vehicle” as the trade-in path for HW3 owners. As of October 31, 2026, a referral link adds nothing to a new-car order. Tesla’s referral page showed one offer, $400 off “Solar Panels & Powerwall,” and its Refer and Earn page lists the Model 3, Model Y and Cybertruck only under loyalty benefits for people who already own a qualifying Tesla product. Not a Tesla App reported in January that a referral order then got a 90-day FSD trial “instead” of the usual 30-day one. Already own a car you have never tried FSD on? Tesla’s FSD referral can get you a one-month trial; the HW3 trial section above lists who qualifies. The Tesla referral guide covers who qualifies and the current financing offers, and discloses that this site earns a referral reward when someone subscribes after a trial from its link; the Model Y and Model 3 guides compare the trims.

On cars older than HW3, the computer touches a few smaller features too. Tesla’s support page notes that the 3.0 upgrade “does enable recording from all cameras with Sentry Mode and DashCam” on cars that had computer 2.0 or 2.5, when paired with the Infotainment Upgrade. The Tesla dashcam USB drive guide covers the recording side. For everything else about living with the car, start at the Tesla owner’s guide.

Frequently asked questions

How do you know if your Tesla has HW3 or HW4?

On the touchscreen, Tesla’s support page says to “Select ‘Controls’ > ‘Software’ and confirm AI computer type. Then press ‘Additional Vehicle Information.’” Per Not a Tesla App, a 3 means HW3 and a 4 means HW4.

Does a 2023 Model Y have HW4?

Some do. Teslarati reported HW4 Model Ys shipping from the Fremont factory in late May 2023, and CleanTechnica wrote at the time that, as far as anyone knew, only Fremont-built cars had it. Check the cameras for red-tinted lenses or check the screen.

Does a 2023 Model 3 have HW4?

Not in North America. HW4 came to the Model 3 with the restyled car, which opened for North American orders in January 2024. North American Model 3s built from about April 12, 2019, through the 2023 model year left the factory with HW3, and cars built before that date started life on an older computer.

Does the Cybertruck have HW4?

Yes. AutoPilot Review notes the Cybertruck “debuted with HW4.”

Can HW3 run FSD?

Yes, under supervision, in the United States and Canada, the markets the cited sources cover. Tesla’s support page, read October 13, 2026, says “All Tesla vehicles require active driver supervision and are not autonomous.” In the United States and Canada, HW3 cars with FSD run the Lite builds of FSD v14; Tesla Oracle reported in July 2026 that HW3 owners in Europe looked set to wait longer. On its first-quarter 2026 earnings call, as Not a Tesla App reported it, Tesla said HW3 will not run unsupervised FSD.

Can an HW3 Tesla get a free FSD trial?

Tesla’s referral terms don’t name HW3. They give an eligible owner a one-month trial “subject to” vehicle eligibility, “including applicable hardware and firmware requirements.” If the Tesla app shows an option to subscribe to FSD under Upgrades, then Software Upgrades, your car meets one of Tesla’s conditions, though some cars need a paid prerequisite upgrade before they can subscribe. You also can’t have subscribed to FSD or redeemed an FSD trial in the past 12 months.

Is your Tesla Intel Atom or AMD Ryzen?

Check the same screen. Tesla’s Grok support page says to “Select ‘Controls’ > ‘Software’ > ‘Additional Vehicle Information’ to view your vehicle’s infotainment processor.” By Not a Tesla App’s February 2025 guide, the Intel unit was fitted through 2022 and every new Tesla came with the AMD one, so a car built after 2022 should have it. The processor is a separate question from HW3 or HW4: Tesla’s requirements for Grok name the processor, a software version and a connection, not the driver-assistance computer.

Your Tesla shows computer 2.5. Can you get HW3?

If you bought FSD outright, Tesla’s US support page, read October 13, 2026, says the upgrade to computer 3.0 is complimentary; FSD subscribers, it says, “may be eligible to upgrade for $1,000.00 plus applicable tax, including installation.” Confirm the current price on that page before you book.

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