336 problems have been reported for the 2006 Cadillac CTS. The following chart shows the 23 most common problems for 2006 Cadillac CTS. The number one most common problem is related to the vehicle's air bags with 88 problems. The second most common problem is related to the vehicle's service brakes, hydraulic (52 problems).
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 2006 Cadillac CTS in the United States are 55,070 units [1]. If the total number of problems reported by Cadillac CTS owners in the last 20 years is 336, and the age of the vehicle is 20, the PPMY index can then be calculated as
PPMY Index = 336 / 55,070 / 20 * 1000 = 0.31.
For more information, refer to this page: A study of reliability comparison across Cadillac CTS model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2006 Cadillac CTS in 2006.
| Service Year | Number of Problems |
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| 2026 | |
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| 2006 |
When making the decision between buying a new or used Cadillac CTS, the following table can be used to compare the 2006 Cadillac CTS with the Cadillac CTS from other model years. Note that the number of problems reported for the 2006 CTS is 336 while the average number of problems reported for the 17 model years of the Cadillac CTS is 168.