Commercial software suites charge hefty annual subscription fees or lock usage behind proprietary hardware tokens. Terry’s tool offers a community-driven, transparent alternative. It gives mechanics full control over the diagnostic commands sent to the car. This flexibility makes it a staple for platform-specific diagnostics on classic LS engine swaps, late-90s trucks, and modern GM performance platforms.
is fundamentally different. It is a manufacturer-specific request protocol designated for enhanced data. General Motors used Mode 22 to transmit proprietary Parameter IDs (PIDs) from internal control modules. Through Mode 22, a computer can request deeply specific metrics—such as precise transmission temperature, individual cylinder misfire counts, knock sensor activity, and body control module (BCM) states—that generic Mode 1 data completely hides. OBD Modes | OBD Solutions gm mode 22 scan tool by terry
By tapping into Mode $22, you can read real-time sensor voltages, switch states, and module statuses that standard OBD2 tools completely ignore. Understanding "Terry's" Mode $22 Tool This flexibility makes it a staple for platform-specific
If you are looking to diagnose a specific issue on your GM vehicle, I can help you understand which (PIDs) to monitor, or I can help you find where to download this software. General Motors used Mode 22 to transmit proprietary