The first-generation infotainment computer found in early Model S and Model X — a well-documented flash storage wear issue that can cause slow performance, a frozen touchscreen, and in advanced cases, loss of climate control and other functions tied to the same system.
The embedded flash memory (eMMC) chip used for logging and caching on the first-generation infotainment computer has a finite write-cycle lifespan, and on vehicles that accumulated enough logging activity, that chip wears out — causing increasingly slow touchscreen response, app crashes, and eventually a fully unresponsive screen. Because the touchscreen also controls climate, defrost, and some driving-relevant functions on these vehicles, this is a more consequential failure than a typical infotainment glitch. Tesla issued a recall addressing a safety-relevant subset of this issue and offers a hardware upgrade path.
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
This issue is tied to accumulated logging activity and calendar age rather than mileage, so even lower-mileage early examples are not exempt.
A documented, upgraded unit is a meaningfully different, much safer proposition regardless of the vehicle's age.
Ask whether the MCU has been upgraded, and get documentation if so — this is the single most important check on any pre-2018 Model S or X.
Test the touchscreen thoroughly during a viewing: app load times, responsiveness, and whether climate controls work normally.
Check recall status by VIN through the manufacturer's official lookup tool, since this issue was partially addressed through a formal recall.
Model-specific pages, with notes on how it behaves in that particular car.