If MotorJury's dataset had to be reduced to a single sentence of advice, it would be this: do not buy the first year of a new generation, and do buy the last year of the old one. It is not a new idea — mechanics have said it for decades — but the federal record lets it be measured, and the measurement is more consistent than almost anything else in the data.
The evidence
Take the largest nameplates on the site and look at the complaint count in the year a new generation launched against the year before it. The Ford Explorer: 291 complaints in 2019, the last of the old car; 1,190 in 2020, the first of the new one. The Honda Pilot: 108 in 2015, 1,688 in 2016. The Honda Odyssey: 39 in 2017, 962 in 2018. The Toyota RAV4: 330 in 2018, 873 in 2019. The Toyota Camry: 148 in 2017, 734 in 2018. The Chevrolet Malibu: 269 in 2015, 1,669 in 2016. The Jeep Cherokee, launching as a new nameplate: 2,641 in 2014. The Hyundai Tucson: 226 in 2015, 1,616 in 2016. The Volkswagen Jetta: 31 in 2018, 545 in 2019. The Ram 1500: 654 in 2018, 1,464 in 2019. The pattern holds for Ford, Honda, Toyota, Chevrolet, Jeep, Hyundai, Volkswagen and Ram, for saloons, crossovers, minivans and trucks, and for good manufacturers as much as bad ones.
The corollary holds too. The last year of a generation is very often the best year in that nameplate's record: the 2019 Explorer scores 82, the 2017 Odyssey 92, the 2015 Pilot 82, the 2018 Jetta 87, the 2017 Chrysler 200 92. A car in its seventh year of production has had six years of running changes, software updates and supplier corrections, and none of the new problems that a redesign brings.
Why it happens
A new generation changes several things at once — the platform, the engine, the transmission, the electrical architecture, the infotainment — and each of them has a failure mode that only appears in the hands of a hundred thousand owners. Transmissions are the usual culprit: the nine-speed in the Cherokee and Pacifica, the ten-speed in the Odyssey, the eight-speed in the Camry and the RAV4, the dual-clutch in the Tucson and the Focus, the CVT in the Altima. Infotainment is the second: nearly every launch year in the dataset carries a spike in complaints about a screen that freezes or a reversing camera that goes black. Engines are the third, and the most expensive: the EcoBoost in the Escape, the 1.5-litre turbo in the CR-V, the Theta II in the Sonata.
Manufacturers fix these things, but they fix them in production first and in the field second, and the field fix is often a software update or a warranty extension rather than a recall. The result is that the cars built in the launch year carry the problem, the cars built two years later do not, and the record shows the difference as a cliff between one model year and the next.
The exceptions
The rule is strong, not absolute. Some launches are clean — the 2021 Hyundai Elantra, the 2020 Nissan Sentra and the 2018 Chevrolet Equinox all launched without a large spike — and they tend to be launches where the powertrain carried over from the previous car or from a sibling. Some old designs decline instead of improving, usually because a component that was marginal when new becomes a failure at age: the 2016 Dodge Grand Caravan, in the seventh year of its generation, is the worst year of its run. And a facelift can behave like a launch: the 2019 Cherokee, the 2019 Pilot and the 2018 Escape all carry spikes in the middle of a generation because a new engine or transmission arrived with the facelift.
How to use it
When you are shopping for a nameplate, find out when its generations changed — the model page on this site shows it as a step in the complaint count, and the year table lets you see it at a glance. Then aim for the last two years before a change or the third year onward after one. If the car you want is a launch year, do not walk away automatically; instead, look up what the launch problems were, and ask the seller for evidence that they have been fixed on that specific car — a replaced transmission, a software campaign, a new screen. A launch-year car with the launch problems documented as fixed can be a good buy at a launch-year price. A launch-year car with no history is the one the rule is warning you about.
Summary
Prefer the last two years of a generation. Avoid the first year unless the known launch faults are documented as fixed. Treat a mid-cycle facelift with a new powertrain as a launch.