Global Diagnostic System 2 (GDS2) is GM's PC-based diagnostic software. An appropriate vehicle communication interface, such as a supported MDI or MDI 2, connects the computer to the vehicle. Techline Connect is GM's integrated application for service information, programming and scan-tool diagnostics. These names describe different parts of the workshop system rather than interchangeable tools. ACDelco Technical Delivery System; GM Techline Connect user guide.
Diagnostic and programming functions
- GDS2: diagnostic software with vehicle-specific diagnostic data packages.
- MDI / MDI 2: vehicle communication interfaces; verify compatibility with the application and vehicle.
- Tech2Win: PC emulation of the earlier Tech 2; separate from GDS2.
- Service Programming System (SPS): the programming workflow; access, calibration availability and security provisions vary.
See the GM ACDelco portal and Techline Connect user guide.
Vehicle coverage
GM's GDS2 vehicle chart shows a model-by-model transition with overlap; for example, its 2010 list includes the Saab 9-5. The Opel/Vauxhall matrix likewise identifies GDS2, Tech2/Tech2Win and Opel/Vauxhall Diagbox by model. A model year alone is not enough to establish coverage, especially across brands and regions.
See GM Tech 2 diagnostic tool, Opel diagnostic systems, and Saab diagnostic systems.
American Honda also specifies MDI 2 and Techline Connect for the 2024 Honda Prologue and Acura ZDX; see Honda and Acura HDS diagnostics. American Honda compatible interfaces.