2009 Cadillac STS - Problems, Statistics, and Analysis

small car iamge Common problems of the 2009 Cadillac STS

18 problems have been reported for the 2009 Cadillac STS. The following chart shows the 10 most common problems for 2009 Cadillac STS. The number one most common problem is related to the vehicle's air bags with 3 problems. The second most common problem is related to the vehicle's service brakes, hydraulic (3 problems).

Table 1. Common problems of the 2009 Cadillac STS

Problem Category Number of Problems
  Air Bag
3
  Service Brakes
3
  Electronic Stability Control
3
  Steering
2
  Vehicle Speed Control
2
  Power Train
1
  Wheel
1
  Equipment
1
  Engine And Engine Cooling
1
  Suspension
1

small car iamge 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 Cadillac STS in the United States are 7,239 units [1]. If the total number of problems reported by Cadillac STS owners in the last 10 years is 18, and the age of the vehicle is 10, the PPMY index can then be calculated as

      PPMY Index = 18 / 7,239 / 10 * 1000 = 0.25.

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

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

Table 2. PPMY Index and Problem Occurrence Trend

Service Year Number of Problems
  2019
0
  2018
0
  2017
6
  2016
1
  2015
5
  2014
3
  2013
0
  2012
0
  2011
0
  2010
2
  2009
1

small car iamge Compare the 2009 Cadillac STS with Other Model Years

When making the decision between buying a new or used Cadillac STS, the following table can be used to compare the 2009 Cadillac STS with the Cadillac STS from other model years. Note that the number of problems reported for the 2009 STS is 18 while the average number of problems reported for the 14 model years of the Cadillac STS is 37.

Table 3. Compare the 2009 Cadillac STS with other model years

Model Year Number of Problems
  2011 STS
8
  2010 STS
6
  2009 STS
18
  2008 STS
60
  2007 STS
57
  2006 STS
181
  2005 STS
123
  2004 STS
7
  2003 STS
10
  2002 STS
9
  2001 STS
12
  2000 STS
13
  1999 STS
13
  1998 STS
3


Switch Year:
Safety Ratings of STS Cars
Fuel Economy of STS Vehicles
STS Service Bulletins
STS Safety Recalls
STS Defect Investigations