Tesla Software Update Check — Decode Autopilot Hardware (HW2 → HW4) by VIN.

Enter the 17-character Tesla VIN into the free Tesla software update check form on this page. The lookup decodes the model year from the VIN's 10th character, combines it with the model line, and maps the result to the Autopilot hardware revision Tesla shipped during that production window: HW2 (2016-2019), HW2.5 (2017-2019), HW3 / FSD Computer (April 2019 through early 2024), or HW4 / AI4 (late 2023 onward). The result returns in seconds with the estimated hardware revision and firmware-eligibility status. For exact hardware confirmation, a Tesla service center can read the installed Autopilot computer directly.

HW2 was Tesla's first Autopilot hardware, shipped from October 2016 through approximately mid-2017, built around the Nvidia Drive PX 2 platform. HW2.5 was an iterative refresh shipped from approximately mid-2017 through early 2019, adding redundant power and slightly more compute. HW3 (also called FSD Computer) was Tesla's first in-house Autopilot computer, shipped from April 2019 through early 2024, and is the minimum hardware revision required to run FSD v12+. HW4 (also called AI4) shipped on new Teslas from late 2023 onward, offers roughly five times the compute of HW3 and updated camera resolution, and runs everything HW3 runs plus future revisions Tesla rolls out for its newest hardware.

Full Self-Driving v12 and later — Tesla's current end-to-end neural-network FSD stack — requires HW3 or HW4 only. HW2 (2016-2019) and HW2.5 (2017-2019) cannot run FSD v12+ regardless of whether the owner has paid for the FSD subscription or transferred FSD entitlement from another vehicle. Tesla wound down the HW2.5-to-HW3 retrofit program by 2024, so HW2 and HW2.5 vehicles are permanently capped at older Autopilot firmware. A Tesla software update check confirms HW3 or HW4 on the VIN before any used-Tesla FSD purchase decision.

In most cases, no. Tesla previously offered an HW2.5-to-HW3 retrofit for customers who had paid for FSD on an HW2.5 vehicle, but the program was largely wound down by 2024. HW2-to-HW3 retrofits were never offered at scale. HW3-to-HW4 retrofits have not been announced and are not currently available. The Autopilot hardware revision a Tesla shipped with is generally the revision it will keep for life. A Tesla software update check is the fastest way to confirm the original hardware revision on a used Tesla before purchase, so you know exactly what FSD and Autopilot capabilities you're inheriting.

Tesla began shipping HW4 (also called AI4) on new Model S and Model X units in approximately October 2023, on new Model Y units in approximately late 2023, and on Cybertruck from initial delivery in November 2023. Model 3 transitioned to HW4 with the Highland refresh that started shipping in late 2023. Older production within the same model year may still carry HW3, so a VIN-level Tesla software update check is the only reliable way to confirm HW3 versus HW4 on a specific used Tesla. For exact hardware confirmation, a Tesla service center can read the installed Autopilot computer directly.

Early Tesla Model S production (2012-2016 with certain ordering windows) shipped with free unlimited Supercharging that originally transferred with the car to subsequent owners. The perk was a key marketing differentiator for the original Model S and persisted on resale for many years. Tesla has gradually unwound the entitlement on resale across multiple policy changes — some early Model S VINs retain free unlimited Supercharging today, others lost it on resale, and Tesla treats the entitlement as account-level rather than VIN-level in many cases. A Tesla software update check flags whether the VIN falls inside the free-Supercharging production window; Tesla service is the authoritative source for current account-level entitlement.

The VIN-level Tesla software update check tells you the Autopilot hardware revision (HW2, HW2.5, HW3, HW4) and the firmware family the Tesla shipped with, but it does not tell you which specific firmware build is currently running on the vehicle. The current firmware version is visible in the MyTesla app vehicle profile screen and on the touchscreen's Software menu. A Tesla service center can also confirm the exact current firmware version and any pending OTA updates. For pre-purchase due diligence, the hardware revision is the more important data point — current firmware updates regularly, hardware does not.

Yes, meaningfully. Used Tesla pricing in markets where FSD demand is high reflects a clear hardware-tier premium: HW4 / AI4 Teslas command a premium over equivalent HW3 units, and HW3 units command a premium over equivalent HW2.5 units due to FSD v12+ eligibility. HW2 and HW2.5 used Teslas trade at a discount in FSD-sensitive markets because they cannot run current Tesla FSD even with a paid subscription. A Tesla software update check confirms the hardware revision before you negotiate, so you know whether the asking price reflects the right hardware tier or whether there is room to adjust.