When one fault is the whole story
Most cars accumulate complaints about everything. A few draw them about one thing, so overwhelmingly that the rest of the car disappears.
A typical model year’s complaints are a scatter. Brakes, electronics, a transmission, some paint, a door latch — spread thin, nothing dominating.
Then there are the years where owners filed about one thing and almost nothing else. Those are the ones worth looking at, because a fault that crowds out everything else is not a quirk. It is the defining fact of that car.
The most concentrated year we can measure is the 2020 Audi A4: 82% of its complaints are about the MMI infotainment system, at 412 times the rate it appears in comparable cars. The largest by volume is the 2006 Chevrolet Malibu — 73% of 1,385 complaints, all about the steering.
The list
Restricted to years with at least 150 complaints, so these are patterns rather than small samples. “Share” is the portion of that year’s complaints mentioning the fault; “multiple” is how much more often it appears than in comparable cars.
| Model year | Fault | Share | Multiple | Complaints |
|---|---|---|---|---|
| 2020 Audi A4 | MMI infotainment | 82.4% | 412× | 284 |
| 2012 Acura TSX | steering | 75.5% | 5.5× | 278 |
| 2022 GMC Yukon XL | engine | 74.8% | 5.6× | 151 |
| 2006 Chevrolet Malibu | steering | 73.1% | 7.2× | 1,385 |
| 2015 GMC Canyon | steering | 70.8% | 5.8× | 319 |
| 2005 Nissan Maxima | transmission | 69.3% | 6.4× | 948 |
| 2008 Ford Ranger | Takata airbags | 68.9% | 2.7× | 325 |
| 2018 Ford Edge | engine | 68.6% | 3.8× | 789 |
| 2007 Chevrolet Malibu | steering | 68.4% | 6.7× | 992 |
| 2021 GMC Yukon XL | engine | 65.7% | 5.0× | 201 |
Two different kinds of extreme
The Audi and the Malibu are at the top of the same table for opposite reasons, and the difference matters more than the ranking.
The A4’s 412× is about distinctiveness. Almost nobody else’s owners write the word “MMI”, because it is Audi’s own system. When a fault is specific to one manufacturer’s part, the multiple goes enormous — it is being measured against a baseline of nearly zero. High multiple, moderate volume.
The Malibu’s 1,385 complaints are about scale. Steering complaints are common across every make, so 7.2× is a much harder number to reach than 412× was. Nearly three-quarters of everything filed about that car, on a sample large enough that it cannot be a handful of unlucky owners, concerning a system that had a federal recall behind it.
If you only read one column, read the volume. A fault at 80% of forty complaints is a rumour. At 73% of 1,385 it is the car.
The Yukon XL appears three times
2021, 2022 and 2023, all engine, all around 70% of their complaints. That is not one bad year — it is a run, which usually means a design rather than a batch.
Three consecutive years of the same fault is the strongest signal in this whole dataset, and it is stronger than any single number in the table above. One year can be a supplier who had a bad quarter. Three is how the thing was built.
What this is not
It is not a ranking of the worst cars. It is a ranking of the most lopsided records, which is a different thing — a car with 500 complaints spread evenly across ten systems does not appear here, and may well be the worse buy.
Nor is share a measure of how often something breaks. It is a measure of what owners chose to write to the federal government about. Nobody files a complaint to report that the car was fine, so these numbers describe the shape of the grievances, not the rate of failure.
Every figure here comes from the model-year pages on this site, and each of those pages shows the words owners actually used.
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