Cadillac STS - Problems, Statistics, and Analysis

Cadillac STS owners have reported a total of 489 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 Cadillac STS. The 2006 Cadillac STS cars have the most problems reported (169 problems).

Table 1. Total number of problems by model year for Cadillac STS

Model Year Number of Problems
  2011 STS
8
  2010 STS
6
  2009 STS
15
  2008 STS
56
  2007 STS
54
  2006 STS
169
  2005 STS
114
  2004 STS
7
  2003 STS
10
  2002 STS
9
  2001 STS
12
  2000 STS
13
  1999 STS
13
  1998 STS
3

  Common problems of Cadillac STS

The following chart shows the 22 most common problems for Cadillac STS cars. The number one most common problem is related to the vehicle's air bags (89 problems). The second most common problem is related to the vehicle's electrical system (78 problems).

Table 2. Common problems of Cadillac STS

Problem Category Number of Problems
  Air Bag
89
  Electrical System
78
  Engine And Engine Cooling
62
  Power Train
35
  Other Fuel System
27
  Service Brakes
26
  Equipment
24
  Electronic Stability Control
21
  Exterior Lighting
17
  Vehicle Speed Control
17
   
  Suspension
17
  Steering
16
  Seats
10
  Wheel
9
  Structure
8
  Seat Belt
8
  Visibility
7
  Tire
5
  Unknown Or Other
5
  Gasoline Fuel System
4
  Latches/locks/linkage
3
  Traction Control System
1

  Compare Reliability Across Model Years Using PPMY Index

It would not be fair to compare the Cadillac STS 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 STS 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 Cadillac STS 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 STS Model Years

STS
Model Year
Problems Sales [1] Vehicle
Age
PPMY Index
  2011 84,6417    
0.25
  2010 63,0128    
0.25
  2009 157,2399    
0.23
  2008 5617,98410    
0.31
  2007 5416,81811    
0.29
  2006 16931,37812    
0.45
  2005 11437,23613    
0.24

  Number of Problems Reported During the First Year

Another way to measure the reliability across the model years of the Cadillac STS 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 STS
1
  2009 STS
1
  2008 STS
4
  2007 STS
7
  2006 STS
6
  2005 STS
9
  2004 STS
2
  2003 STS
3
  2001 STS
1
  2000 STS
1


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