Chevrolet Cobalt SS: which years to buy, and what breaks on them
Best and worst years of the Chevrolet Cobalt SS
Of the 2 model years of the Chevrolet Cobalt SS that carry enough owner reports to score, 2008 comes out best at 71 out of 100 and 2009 worst at 78. The scores rank each year against other cars of the same model year, so an older one is not penalised for having had longer to break.
353 owner reports across 3 model years, 320 of them carrying an odometer reading. 2 years carry enough reports to score.
The year to buy, and the year to avoid
Both figures are ranks against other vehicles of the same model year, so the two are comparable even when the years are a decade apart. Each links to that year's full report.
2008 Chevrolet Cobalt SS
Best of 3 years on 117 owner reports, its own worst problem being other brake problem. Evidence behind the score: low confidence.
2009 Chevrolet Cobalt SS
Risk 78 of 100 from 222 reports, worst problem other brake problem.
Severe Low confidence confidence
What tends to break across the Chevrolet Cobalt SS
Taking the most-reported failure from each model year, the recurring problems on the Chevrolet Cobalt SS are other brake problem (worst mode in 2 years) and other steering problem (worst mode in 1 year). A fault that heads the list in most years is characteristic of the design; one that heads a single year is usually a batch or a supplier.
Every model year, scored
| Year | Reports | Per 1,000 | Median report | Most reported problem | Recalls | Risk | Confidence |
|---|---|---|---|---|---|---|---|
| 2008 Chevrolet Cobalt SS | 117 | — | 18k | Other brake problem | 0 | 71 | Low confidence |
| 2009 Chevrolet Cobalt SS | 222 | — | 12k | Other brake problem | 0 | 78 | Low confidence |
| 2010 Chevrolet Cobalt SS | 14 | — | 57k | Other steering problem | 0 | not rated | Unrated |
What each column means
Reports counts owner complaints filed with NHTSA against that model year. Filing is voluntary and unverified, so the count is a floor on how often something went wrong, never a census. It also rises with how many cars were sold, which is why the next column exists.
Per 1,000 divides those reports by an estimate of how many of that model year are on the road, so a common car and a rare one can be compared. The estimate comes from the vehicle counts in recall campaigns covering the same model year, which is the only per-model fleet figure published free of charge; where no recall covers a year, this column is blank rather than guessed.
Median report is the odometer reading at the midpoint of that year's reports: half of the readings owners gave were below it. It is a description of when problems get reported, not a prediction of when this car will break, and it needs at least eight readings before it is shown at all.
Risk is a 0–100 score combining how often reports arrive relative to fleet size, how serious they are, and how early they land, ranked against other vehicles of the same model year only. Confidence says how much evidence sits behind it: a low score on thin evidence is a shrug, not a clean bill of health. Both are defined in full on the methodology page.
Generations, and why the boundary matters
The Chevrolet Cobalt SS splits into generation: 2008–2010 (best 2008, worst 2009). Comparing years inside one generation is the fair comparison — same body, same engines, usually the same suppliers.
Generation boundaries here are inferred from the pattern of model years in the data rather than taken from manufacturer documentation, so they are occasionally a year out. Where a boundary matters to a purchase, check it against the build date on the car.
How to use this page
The honest way to read a table like this is worst-first: rule out the years with high scores and heavy complaint volume, then choose among the rest on condition, history and price. A low score is not a promise, and a high one is not a verdict on the specific car in front of you.
Every figure comes from owner complaints filed with NHTSA and from recall records, both voluntary in the sense that nobody audits them for completeness. Counts are floors. The AtWhatMileage methodology page sets out each formula.
Questions this page answers
What is the best year for the Chevrolet Cobalt SS?
Of the model years we can rate, 2008 Chevrolet Cobalt SS scores best at 71 out of 100, based on 117 owner reports. 2009 scores worst at 78.
Which years of the Chevrolet Cobalt SS should you avoid?
2009 has the highest risk score in this model line at 78 out of 100. The scores compare each year against other vehicles of the same model year, so they are not affected by age alone.
How the generations are drawn. NHTSA does not publish generation boundaries, so ours are inferred from breaks in the recall and complaint record and from the model's own year range. They are close to the enthusiast consensus but not authoritative — if a boundary looks wrong for a car you know well, tell us and we will fix the table rather than argue with you.
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed