This is where you’ll find codes specifically for your GMC. GMC which stands for General Motor Company has been around since 1902. They are primarily focused on building quality trucks and SUVs. Some of their most popular makes are the Sierra, Acadia, and Yukon. In this section, we will cover the most common trouble codes for GMC, and explain what they mean, the symptoms, the cause, the severity, and we will walk you through basic diagnostic steps. If the issue that you are having is not covered in this section, see our other DTC categories for general codes and issues.