GMC Terrain owners have reported a total of 4,237 problems for their cars built in the 18 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 GMC Terrain. The 2011 GMC Terrain cars have the most problems reported (546 problems).
The following chart shows the 33 most common problems for GMC Terrain cars. The number one most common problem is related to the vehicle's engine and engine cooling (1,221 problems). The second most common problem is related to the vehicle's visibility (500 problems).
It would not be fair to compare the GMC Terrain 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 Terrain 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 GMC Terrain 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.
Another way to measure the reliability across the model years of the GMC Terrain is to use the total number of problems reported during the vehicle's first year in service, as shown in the Table 4.
| Model Year | Problems Reported |
|---|---|
| 2026 Terrain | |
| 2025 Terrain | |
| 2024 Terrain | |
| 2023 Terrain | |
| 2022 Terrain | |
| 2021 Terrain | |
| 2020 Terrain | |
| 2019 Terrain | |
| 2018 Terrain | |
| 2017 Terrain | |
| 2016 Terrain | |
| 2015 Terrain | |
| 2014 Terrain | |
| 2013 Terrain | |
| 2012 Terrain | |
| 2011 Terrain | |
| 2010 Terrain |
| ☘ Terrain Service Bulletins |
| ⚑ Terrain Safety Recalls |
| ☤ Terrain Defect Investigations |
| Compare Reliability: |