Tech 2 Scan Tool: A Comprehensive Guide Introduction The Tech 2 Scan Tool is a highly advanced diagnostic tool used by automotive technicians for troubleshooting and diagnosing problems in vehicles. It is specifically designed for General Motors (GM) vehicles and has become the industry standard for GM vehicle diagnostics. In this guide, we will explore the features, benefits, and usage of the Tech 2 Scan Tool. 1. What is a Tech 2 Scan Tool?