Chevrolet Cobalt - Problems, Statistics, and Analysis

Chevrolet Cobalt owners have reported a total of 8,772 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 (2,649 problems).

Table 1. Total number of problems by model year for Chevrolet Cobalt

  Common problems of Chevrolet Cobalt

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 (3,455 problems). The second most common problem is related to the vehicle's electrical system (1,277 problems).

Table 2. Common problems of Chevrolet Cobalt

Problem Category Number of Problems
  Steering
3,455
  Electrical System
1,277
  Other Fuel System
907
  Air Bag
558
  Service Brakes
394
  Engine And Engine Cooling
392
  Gasoline Fuel System
323
  Equipment
295
  Power Train
272
  Suspension
152
   
  Vehicle Speed Control
121
  Structure
118
  Electronic Stability Control
102
  Exterior Lighting
71
  Latches/locks/linkage
62
  Unknown Or Other
54
  Seat Belt
48
  Wheel
44
  Parking Brake
33
  Visibility
29
  Tire
26
  Traction Control System
20
  Seats
7
  Interior Lighting
5
  Air Brake
4
  Child Seat
2
  Lane Departure
1

  Compare Reliability Across Model Years Using PPMY Index

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.

Table 3. Use PPMY Index to Compare Reliability Across Cobalt Model Years

Cobalt
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2010 589116,2739    
0.56
  2009 903141,58810    
0.64
  2008 1,007176,47111    
0.52
  2007 1,732216,64512    
0.67
  2006 2,649229,57613    
0.89
  2005 1,879140,97514    
0.95

  Number of Problems Reported During the First Year

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.

Table 4. Number of problems in vehicle's; first service year

Model YearProblems Reported
  2010 Cobalt
33
  2009 Cobalt
119
  2008 Cobalt
33
  2007 Cobalt
45
  2006 Cobalt
63
  2005 Cobalt
83


Switch Model:
Select Year:
Fuel Economy of Cobalt Vehicles
Cobalt Service Bulletins
Cobalt Safety Recalls
Cobalt Defect Investigations