# 2009 Chevrolet Cobalt - Problems, Statistics, and Analysis

## Common problems of the 2009 Chevrolet Cobalt

788 problems have been reported for the 2009 Chevrolet Cobalt.
The following chart shows the 24 most common problems for 2009 Chevrolet Cobalt.
The number one most common problem is related to the vehicle's service brakes, hydraulic
with 154 problems.
The second most common problem is related to the vehicle's steering
(151 problems).

### Table 1. Common problems of the 2009 Chevrolet Cobalt

##
PPMY Index and Problem Occurrence Trend

In our research we use the PPMY index to compare the reliability of vehicles. The PPMY index of a certain model is defined as the *problems reported per thousand vehicles per Year*. The total sales of the 2009 Chevrolet Cobalt in the United States are 141,588 units [1]. If the total number of problems reported by Chevrolet Cobalt owners in the last 9 years is 788, and the age of the vehicle is 9, the PPMY index can then be calculated as

PPMY Index = 788 / 141,588 / 9 * 1000 = 0.62.

For more information, refer to this page: A study of reliability comparison across Chevrolet Cobalt model year vehicles.

The following chart shows the number of problems reported during each of the service
years since the debut of the 2009 Chevrolet Cobalt in 2009.

#### Table 2. PPMY Index and Problem Occurrence Trend

Service Year | Number of Problems |

2009 |
1 |

2010 |
107 |

2011 |
82 |

2012 |
70 |

2013 |
55 |

2014 |
167 |

2015 |
62 |

2016 |
58 |

2017 |
48 |

2018 |
10 |

##
Compare the 2009 Chevrolet Cobalt with Other Model Years

When making the decision between buying a new or used Chevrolet Cobalt,
the following table can be used to compare the 2009 Chevrolet Cobalt
with the Chevrolet Cobalt from other model years.
Note that the number of problems reported for the 2009 Cobalt is 788
while the average number of problems reported for the 11 model years of the Chevrolet Cobalt is 758.

### Table 3. Compare the 2009 Chevrolet Cobalt with other model years