: The software is compatible with Windows, OSX, and older mobile operating systems such as PalmOS and Pocket PC.
Because these codes are proprietary, they are often guarded by manufacturers or sold for high fees. Terry's scan tool was developed to give enthusiasts a way to request this data without needing expensive dealership equipment like the GM MDI 2 . Why Use the "Terry" Version?
In the world of GM tuning and diagnostics, “Terry” is a whispered name of respect. While multiple developers have created Mode 22 interfaces, the version most widely known as “the Terry tool” or “Terry’s Mode 22 Scanner” originated from the early 2000s GM EFI tuning forums (like thirdgen.org, DIY-EFI, and Gearhead-EFI).
