Gm Mode 22 Scan Tool By Terry [verified] Jun 2026

Vehicle diagnostics rely on specific "modes" of communication established by the Society of Automotive Engineers (SAE). While Mode $01 reads live powertrain data and Mode $03 reads standard trouble codes, is a proprietary diagnostic mode reserved by General Motors.

Unlike rigid handheld scanners, Terry’s tool allows users to import or edit custom PID maps. If you are running a niche configuration—such as a turbocharged 5.3L LS swap with an aftermarket 3-bar MAP sensor—you can program the exact hexadecimal memory addresses into the tool to read boost pressures accurately. 3. RAM Address Interrogation gm mode 22 scan tool by terry

The tool became a staple in online enthusiast communities. It allowed owners of classic GM platforms—such as the LS-based trucks, Corvettes, and late-model Pontiacs—to perform their own tuning, troubleshoot intermittent electrical ghosts, and verify the health of their drivetrains without a trip to the dealership. Technical Simplicity If you are running a niche configuration—such as

In the world of DIY automotive diagnostics, standard OBD-II readers are often the first tool a car owner buys. They pull powertrain codes, track basic live data like RPM and coolant temperature, and help reset check engine lights. However, for General Motors (GM) enthusiasts and mechanics tracking down complex, intermittent issues, standard OBD-II data (known as Mode 01) barely scratches the surface. To truly see what is happening inside a vehicle's Powertrain Control Module (PCM), you need access to manufacturer-specific parameters. It allowed owners of classic GM platforms—such as

: Like most ELM327-compatible software, it allows users to: Read and clear diagnostic trouble codes (DTCs). Monitor real-time engine data and sensor values. Detect specific system pressures and status indicators.