GMC Terrain check engine light illuminated, vehicle appears to run fine on GMC Terrain

Some GMC Terrain owners report experiencing issues when the check engine light illuminates, even if the vehicle seems to run fine. This light serves as an early warning system that may signal underlying problems requiring attention. In some cases, the light may remain steadily illuminated, prompting owners to check the fuel cap and fuel quality to avoid engine performance issues. However, a flashing check engine light is a serious concern, indicating a potential catastrophic misfire that could damage the catalytic converter and should be addressed immediately. Additionally, owners experiencing performance issues such as a significant drop in engine power, rough idling, or difficulty starting the vehicle are advised to seek professional assistance promptly to prevent further complications.