Chevrolet Cobalt owners have reported a total of 8,716 problems for their cars built in the 14 model years listed in the chart below. The chart shows the number of problems reported across all service years for each given model year of the Chevrolet Cobalt. The 2006 Chevrolet Cobalt cars have the most problems reported (2,641 problems).
The following chart shows the 27 most common problems for Chevrolet Cobalt cars. The number one most common problem is related to the vehicle's steering (3,440 problems). The second most common problem is related to the vehicle's electrical system (1,272 problems).
|Problem Category||Number of Problems|
|Other Fuel System|
|Engine And Engine Cooling|
|Gasoline Fuel System|
|Vehicle Speed Control|
|Electronic Stability Control|
|Unknown Or Other|
|Traction Control System|
It would not be fair to compare the Chevrolet Cobalt of an older model year to newer model years since older vehicles have been in service longer and thus are expected to have more problems. In order to compare the reliability across Cobalt model years, we use the PPMY index which is defined as the problems reported per thousand vehicles per Year. A smaller PPMY index indicates greater reliability of the given model year cars.
PPMY = P / S / Y * 1000,
where P = total problems reported during the life of a Chevrolet Cobalt model year; S = total units sold of the model year; Y = years since the debut of the model year (the age of the vehicle).
The results are shown in Table 3.
Another way to measure the reliability across the model years of the Chevrolet Cobalt is to use the total number of problems reported during the vehicle's first year in service, as shown in the Table 4.
|Model Year||Problems Reported|