The government has been filing automotive failure under component names since the register opened, and a filing system kept for sixty years becomes something its keepers never intended: a fossil record. Somewhere in these drawers, carburetors go extinct. Seat belts get solved, then quietly come back as electronics. Steering stops being recalled and starts being complained about. And a word that appears in 0.26% of recall filings in the 1990s appears in 42.91% of them in the 2020s. I cut both registers, 274,000 recall filings and 2.1 million complaints, into decade shelves by component family. This is the excavation.
Reading a sixty-year filing cabinet honestly
Two caveats before the digging, because the cabinet has quirks. The recall register's campaign dates only become dense in the 1980s: the earliest campaigns from the Act's first years sit in the record with sparse dating, so the decade shelves here run confidently from the 1980s forward. The complaint register is younger still: its handful of 1960s and 1970s failure dates are back-filed decades after the fact and visibly noisy, so complaints get read from the 1990s on. The title says 1966 because that is when the drawer was installed. The legible strata start a little later, and I would rather show you clean layers than deep ones.
The mechanical age
The oldest legible shelf belongs to the machine shop. In the 1980s the recall register is led by the fuel system at 12.6%, steering at 11.7%, and vehicle speed control at 9.6%: hoses, linkages, throttle cables, the parts a mechanic could hold. The 1990s complaint register is even blunter, with hydraulic brakes alone taking 17.6% of everything owners filed, the largest single-system share any component posts in any decade of either register, right through the industry's rough transition to antilock systems. And here on the early shelves sits the register's one true extinction: the carburetor, 0.64% of 1980s recalls, a trace in the 1990s, and then nothing. Fuel injection did not reduce carburetor failures. It removed the organ. No component with the word carburetor in it has been recalled since the 2000s, and no owner has complained about one since roughly the same time. The fossil record is unambiguous.
The restraint decades
The middle strata belong to the things that hold you in the seat. Seat belts peak as a complaint at 10.2% in the 1980s and then fall in a nearly straight line to 1.0% in the 2020s, which is what a solved problem looks like in this data. Except the recall register tells a stranger story: belts' recall share, after fading through the 2000s, climbs back to 4.5% in the 2020s. The belt did not get worse. The belt stopped being a strap and became a device, with pyrotechnic pretensioners and load limiters and wiring, and the modern belt recall is an electronics recall wearing a 1960s category name. Air bags run the arc in compressed time: under 2% of 1990s recalls, then 9.0% of the entire 2010s register as the Takata era detonated through the industry, with complaints peaking at 11.1% the same decade, then both receding. That single inflator campaign bent a whole decade's shelf, and its long procedural afterlife is a story this site has already told.
The junk drawer
Every filing cabinet has one. The register's is called EQUIPMENT, and for two straight decades it was the biggest drawer in the building: 22.7% of 2000s recalls and 22.3% of the 2010s. This is where the government files the recalls of things that are not exactly cars: child seats, trailer hitches, camper equipment, aftermarket accessories, and the wheelchair lifts and ramps of the adaptive-mobility trade, which carry their own category at 4 to 6% through those decades and which produced some of the most-referenced supplier campaigns in the register. The junk drawer is a useful humility check on every chart in this article: the recall system's jurisdiction is wider than the vehicle, and always has been.
The migration
Now the top shelf, where everything changes at once. ELECTRICAL SYSTEM, which spent four decades bouncing between 5 and 7% of recalls, jumps to 11.1% in the 2010s and then 23.7% in the 2020s, the largest category in the modern register by a factor of two. Two categories that did not meaningfully exist for most of the register's life walk straight into the 2020s top three: COMMUNICATION at 10.9%, the filing home of telematics, displays and connectivity, and BACK OVER PREVENTION at 8.3%, which is what happens when a rearview camera becomes mandatory equipment and the camera, the screen and the software between them become a thing that can fail. Add the recalls filed with SOFTWARE in the component string itself, 15.6% of the 2020s from a standing start, and the migration is complete: failure has moved from the machine shop to the circuit board. The clearest single measure is the one below. Read the government's own descriptions of what is wrong and how it will be fixed, and software goes from one recall in four hundred in the 1990s to a shade under half of everything filed in the 2020s.
And here is my favorite detail in the whole excavation: the complaint register barely knows. Owners file SOFTWARE as the component on 0.04% of 2020s complaints. Nobody experiences software. They experience the dead screen, the car that will not start, the warning light that lies, and they file it under electrical, engine, or unknown, exactly as their grandparents would have. The manufacturers' filings say software because the fix is an update; the owners' filings say symptoms because that is what failure feels like. The taxonomy lag between those two numbers, 42.91% against 0.04%, is the truest picture of the modern car this register contains.
Steering, the perfect specimen
One component runs the whole sixty-year story in miniature. Steering's recall share collapses from 11.7% in the 1980s to 2.8% in the 2020s: the mechanical linkage, the thing that used to detach, got engineered into reliability. But steering's complaint share went the other way, rising to 8.1% in the 2010s as electric power steering spread through the fleet and owners met a new failure mode, the assist that quits. The recalls fixed the linkage. The complaints found the motor. The same word, filed in the same drawer, describing two different machines, and a preview of how the electric era files its grievances.
What the 2030s shelf will hold
The register already whispers it. FORWARD COLLISION AVOIDANCE, a category that barely existed ten years ago, has entered the 2020s complaint top ten at 4.8%: the driver-assistance stack is starting to accumulate its grievance file, right on schedule. The pattern of sixty years says each era files its complaints against its newest promise, and the newest promise is a camera that says it is watching the road. So the prediction writes itself. The 2030s shelf will be led by electrical, software and the assistance systems, the mechanical families will keep shrinking toward the floor, and some category that does not exist today will need inventing, because the register's deepest lesson is that the parts bin never stops adding drawers. It only stops opening the old ones. The full component map, cut across every vehicle rather than every decade, lives in the fault index, and the question of whether all this migration made cars safer is its own article.