359 problems have been reported for the 2011 GMC Sierra 1500. The following chart shows the 21 most common problems for 2011 GMC Sierra 1500. The number one most common problem is related to the vehicle's air bags with 114 problems. The second most common problem is related to the vehicle's equipment (77 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 2011 GMC Sierra 1500 in the United States are 129,584 units [1]. If the total number of problems reported by GMC Sierra 1500 owners in the last 15 years is 359, and the age of the vehicle is 15, the PPMY index can then be calculated as
PPMY Index = 359 / 129,584 / 15 * 1000 = 0.18.
For more information, refer to this page: A study of reliability comparison across GMC Sierra 1500 model year vehicles.
The following chart shows the number of problems reported during each of the service years since the debut of the 2011 GMC Sierra 1500 in 2011.
| Service Year | Number of Problems |
|---|---|
| 2026 | |
| 2025 | |
| 2024 | |
| 2023 | |
| 2022 | |
| 2021 | |
| 2020 | |
| 2019 | |
| 2018 | |
| 2017 | |
| 2016 | |
| 2015 | |
| 2014 | |
| 2013 | |
| 2012 | |
| 2011 |
When making the decision between buying a new or used GMC Sierra 1500, the following table can be used to compare the 2011 GMC Sierra 1500 with the GMC Sierra 1500 from other model years. Note that the number of problems reported for the 2011 Sierra 1500 is 359 while the average number of problems reported for the 31 model years of the GMC Sierra 1500 is 327.