Terry’s custom implementation of the Mode $22 protocol stands out due to several distinct advantages engineered specifically for GM platforms (spanning from the late-1990s Gen III LS1 engines to modern Gen V LT architectures): 1. High-Speed Data Streaming (High PID Density)
I can provide the precise hexadecimal strings or setup steps for your project. Share public link
, however, is a proprietary GM diagnostic service. It allows for "Read Data by Identifier" (DID). In plain English: it lets you request specific, high-resolution data parameters that aren't available on standard scanners. We’re talking about granular transmission pressures, individual wheel speed sensor data, injector pulse widths, and knock sensor activity that standard tools often miss or lag on. The Man Behind the Tool: Who is Terry?
Overall, the GM Mode 22 scan tool by Terry is a valuable diagnostic tool that can help technicians and repair shops improve their efficiency and accuracy when working on GM vehicles. gm mode 22 scan tool by terry
: The software is compatible with Windows, OSX, and older mobile operating systems such as PalmOS and Pocket PC.
: It enables users to view proprietary sensor data that generic tools might miss, such as specific transmission temperatures, ABS data, or body control module (BCM) status. Functionality Comparison
To understand the tool, you must understand the protocol. OBD2 systems support ten modes of operation, ranging from reading codes (Mode 03) to clearing them (Mode 04). Terry’s custom implementation of the Mode $22 protocol
Tracks individual cylinder misfires over time, rather than just waiting for a P0300 code to trip the Check Engine Light.
To use the GM Mode 22 Scan Tool by Terry, you need three components:
| Tool | Mode 22 Support | Price | Ease of Use | |------|----------------|-------|--------------| | Terry’s Tool | Yes (older GM) | Free | Moderate (requires PC) | | Tech 2 | Full | $500–2000 | High | | Autel MaxiDiag | Partial (some PIDs) | $500+ | High | | Torque Pro + custom PIDs | Limited (requires manual PID entry) | $5 | Medium | It allows for "Read Data by Identifier" (DID)
If you own a GM vehicle from the early 2000s to the early 2010s, this tool is invaluable for:
The software was famously designed to run on older DOS or Windows 95/98 laptops, making it perfect for pairing with a budget-friendly, "garage-only" laptop. How to Set Up the Tool
The GM Mode 22 Scan Tool by Terry serves as a testament to the power of the . It bridged the gap between expensive professional equipment and the limited functionality of generic code readers. By democratizing access to manufacturer-specific data, it empowered thousands of vehicle owners to better understand, maintain, and enjoy their GM vehicles.