When do cars break?
Not if — when. Using the odometer readings owners file with their NHTSA complaints, here is the mileage each system actually tends to fail at. It’s the one thing a spec sheet can’t tell you, and almost no one else publishes it.
Most "reliability" numbers tell you how often something breaks. They almost never tell you when — and when is what decides whether a repair lands under warranty or in your lap. The NHTSA complaint file carries the odometer reading on each report; the public API throws it away. We keep it. That’s the whole edge here: failure timing, by system, from 9,187 patterns with real mileage behind them.
Which systems fail first
Median reported failure mileage by system. Earliest at the top.
Before the warranty—or after
The typical 60,000-mile powertrain warranty is the line that decides who pays.
Usually fails before 60k mi
- Tires 29k mi
- Cruise Control 48k mi
- Brakes 49k mi
- Visibility 49k mi
- Wheels 50k mi
Covered, if you still have the car under warranty.
Usually waits until after 60k mi
- Steering 61k mi
- Body 62k mi
- Powertrain 62k mi
- Fuel System 63k mi
- Electrical 64k mi
- Lighting 65k mi
- Suspension 66k mi
- Airbags 68k mi
- Engine 72k mi
- Seatbelts 72k mi
On your dime. This is the case for — or against — an extended warranty.
Failures that hit shockingly early
High-volume patterns reported at very low mileage — problems owners hit almost new.
| Mileage | Vehicle & system | Complaints |
|---|---|---|
| 5k mi | 2020 Jeep Wrangler steering | 234 |
| 6k mi | 2019 Honda Pilot electrical | 227 |
| 6k mi | 2020 Subaru Outback electrical | 245 |
| 7k mi | 2022 Subaru Outback visibility | 261 |
| 7k mi | 2020 Subaru Forester visibility | 287 |
| 7k mi | 2020 Subaru Outback visibility | 354 |
| 8k mi | 2019 Jeep Wrangler steering | 438 |
| 8k mi | 2018 Jeep Wrangler steering | 1,109 |
How this is measured
Each figure is the median of owner-reported failure mileage, parsed from NHTSA’s ODI bulk complaint export and validated to a 1,000–400,000-mile range. A system or pattern is only shown once it has at least 8 odometer-bearing complaints. System medians are the median of the per-pattern medians. NHTSA complaints are unverified consumer reports; these are distributions, not predictions for an individual vehicle. Full per-vehicle data is in the data center.
Go deeper
Common questions
At what mileage do most car problems appear?
It depends entirely on the system. Tires and brakes are reported failing earliest (median around 29k mi and 49k mi), while engine and airbag failures cluster much later (around 72k mi). The full ranking is above, built from 9,187 failure patterns that carry real odometer readings.
How do you know the mileage a failure happens at?
NHTSA’s bulk complaint export (the ODI flat-file) includes the odometer reading owners report when they file. The public NHTSA API drops that field — we parse it from the bulk file, validate it to a sane range, and only publish a figure when a pattern has at least 8 odometer-bearing complaints. That’s why we can show when a failure hits, not just how often.
Why does this matter when buying a used car?
If a car is approaching the mileage a known failure tends to hit, you’re buying the bill. Matching a specific vehicle’s mileage against its documented failure pattern is one of the most useful checks a buyer can run — and it’s why so many defects surface right after the factory warranty lapses.
Are these exact predictions?
No. These are medians of owner-reported failure mileage — half the reports land earlier, half later — and complaints are unverified. Treat them as the center of a distribution, not a guarantee for any single car.