The industry cannot say if a software car lasts 12.8 years, and residuals assume it does

The auto industry has no answer to a basic underwriting question: how long a software-defined vehicle stays a working product. CNBC reports that the average US vehicle age has risen to 12.8 years, according to Mobility Global, while some analysts and forecasters worry that these computer-heavy cars will age more like smartphones ^[1][2].

That matters because the useful life assumption sits under residual value forecasts, extended service contracts, and long-term parts obligations. The best number anyone in the story offers is a range. Rivian's chief software officer, Wassym Bensaid, says the company tries to build enough hardware capability, which he calls headroom, to carry roughly seven to 10 years of software upgrades ^[12]. Against a 12.8-year average vehicle age, that window closes somewhere between 2.8 and 5.8 years before the average car is retired ^[1]. Bensaid draws a line between feature updates and safety or security updates, and commits to the latter indefinitely, saying the vehicle stays fully functional and fully safe for the duration of ownership ^[13]. The reporting contains no figure for what indefinite patching costs; it notes only that maintaining software costs money and that hardware breaks and needs replacing ^[16].

Bensaid also markets the upside, saying the least capable Rivian an owner will ever have is the one delivered on purchase day ^[4]. Sam Fiorani of AutoForecastSolutions puts the other side plainly: "We honestly don't know how long these vehicles will last," and he says problems with hardware unable to handle new software are already appearing ^[7]. Sam Abuelsamid of Telemetry expects the common pattern to be a few years of feature updates, then a drop-off as software outgrows hardware, with basic safety and security support continuing because product liability gives automakers an incentive to keep fixing defects ^[14][15].

There are two precedents worth carrying into any model. When AT&T shut down its 3G network in 2022, millions of vehicles across many brands lost features including emergency response services and some navigation and infotainment, while remaining drivable ^[8]. Tesla said in 2016 that every vehicle in production had the hardware needed for full self-driving, and Elon Musk reaffirmed in 2019 that Hardware 3 would support it; this April Musk said Hardware 3 cars would need upgraded computers and cameras for unsupervised FSD, with qualifying customers offered either a hardware upgrade or a discounted trade-in ^[9][10]. Tesla did not respond to CNBC's request for comment ^[11]. That remedy is the shape of the liability: a retrofit or a subsidised trade, funded years after the revenue was booked.

On residuals, Alex Yurchenko of J.D. Power says software-defined vehicles are "unlikely to fundamentally change the used car market," but expects it may split into cars with ongoing over-the-air support that hold value better and cars without, with certified pre-owned programs gaining importance as reassurance ^[19][20]. Fiorani says more customers are moving to used cars and worries about the long-term supply of affordable ones ^[18]. The 3G shutdown already raised the resale question ^[17], and features going dark on a purchase averaging nearly $50,000 is a different consumer problem than a phone losing support ^[5][6].

Watch for the first automaker to publish a dated support window rather than a marketing adjective, and for used-vehicle valuation providers to start tagging listings by whether over-the-air support is still live. Yurchenko's own summary is the honest one: valuation remains a challenge ^[20].