GM Diagnostics

GM SPS2, GDS2, Tech2Win and Techline Connect programming and interfaces.

SPS2GDS2Tech2WinTechline ConnectMDIMDI2J2534

Guides and technical resources

ACDelco TDS Explained: Service Information vs Diagnostics vs Programming

Check Engine Lights on GMC Sierra [Resolved]

In-Depth Guide to Custom Update Modes in Tech2Win

The Ultimate Guide to GM Diagnostic Tools

GM Global Connect Login — Official Links + Fixes (2026)

GM Service Information (SI): What It Is, What It Covers, and How Shops Use It

GM SPS2, GDS2 & Tech2Win Explained: Which GM Software Do You Need?

GM's software stack untangled: Techline Connect, SPS2 programming, GDS2 diagnostics and Tech2Win for older vehicles — which model years need which tool, and which subscription or package to buy.

GM SPS2 J2534 Setup

A verified GM SPS2 / Techline Connect J2534 setup guide: which interfaces are supported vs verify-first, the account and PC prerequisites, the connection sequence and how to isolate detection failures.