Gm Mode 22 Scan Tool By Terry Jun 2026

While Terry's tool was revolutionary at the time, diagnostic technology has moved forward. If you cannot find a working copy of this software, or if you have a newer vehicle, consider these alternatives:

What are you trying to track down? What OBD-II hardware adapter do you plan to use?

This indicates an incorrect baud rate setting in the software or device manager. Disconnect, adjust the speed, and retry. gm mode 22 scan tool by terry

It provides real-time data monitoring, including oxygen sensor voltage, coolant temperature, TPS (Throttle Position Sensor) percentage, spark advance, and BLM (Block Learn Multiplier). Why Use Terry’s Mode 22 Scan Tool?

This guide covers what Mode $22 is, how Terry’s tool works, and how to use it for advanced GM diagnostics. What is GM Mode $22? While Terry's tool was revolutionary at the time,

Mode $22 is a proprietary General Motors diagnostic mode. It allows communication with specific Electronic Control Units (ECUs) to request enhanced, manufacturer-specific Data Parameters (PIDs). By tapping into Mode $22, you can monitor advanced metrics, including: Individual wheel speed sensor data (ABS module) Transmission fluid temperature and pressure switches

I can provide specific setup tips or PID configurations tailored to your vehicle. Share public link This indicates an incorrect baud rate setting in

Monitoring TPS to ensure it is not sticking.

To truly understand the power of this tool, it's essential to grasp what Mode 22 is. In the world of On-Board Diagnostics (OBD-II), different "modes" are used to request various types of data from a vehicle's Electronic Control Unit (ECU). While Mode 01 is the standard for requesting generic real-time data, Mode 22 is a more advanced request mode.

In the automotive hobbyist community, independent developers often create specialized software routines or hardware configurations to bypass expensive dealership equipment like the Tech 2 or GM MDI.