Gm Mode 22 Scan Tool By Terry Best <CONFIRMED × 2026>

GM Mode 22 Scan Tool by Terry is a legacy, free software utility designed for diagnosing General Motors vehicles. It primarily serves as an interpreter for "Mode 22" (also known as Mode $22), a proprietary diagnostic mode used by GM to provide enhanced sensor data that standard OBD-II protocols do not typically reveal. Core Functionality Enhanced Data Retrieval

hardware requirements

Should we look into the needed to run this software, or gm mode 22 scan tool by terry

Availability and Usage

The GM Mode 22 Scan Tool by Terry is a compact, budget-friendly OBD2 diagnostic adapter aimed primarily at GM vehicle owners who want quick access to enhanced diagnostic and programming features specific to GM’s Mode 22 data.

Enhanced sensor data (fuel trims per cylinder, knock sensor voltages, etc.)
Proprietary trouble codes (much more specific than standard OBD codes)
Bi-directional controls (activating fans, fuel pumps, EGR solenoids on command)
Real-time parameters not broadcast in the default data stream

: It was developed as a free alternative to expensive professional tools like the or modern GDS2 systems. Key Technical Capabilities Enhanced PID Access GM Mode 22 Scan Tool by Terry is

The GM Mode 22 scan tool features a user-friendly interface, with a logical and intuitive layout. The main dashboard provides quick access to essential functions, while the menu system allows users to navigate to more advanced features. The GM Mode 22 Scan Tool by Terry

The "Terry Test": A one-click button that commands the Cooling Fans to High, turns on the A/C Compressor, and commands the IAC (Idle Air Control) to a set RPM. This allows the user to instantly check if the system can handle a high-load thermal stress test.

GM Mode 22 Scan Tool by Terry

Enter the . This specialized tool has gained a cult following in automotive forums and tuning circles for its ability to bridge the gap between basic consumer scanners and thousand-dollar professional diagnostic suites.