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

: Terry's tool became a staple on forums like Scantool.net and early car-tuning communities. It paved the way for modern, affordable bi-directional scanners from brands like Launch and Autel that we use today.

Mode 22 is primarily found on GM vehicles from ~1996 to 2006 (pre-CAN bus transition), covering: gm mode 22 scan tool by terry

On your scanner, select “GM Enhanced” or “Manufacturer Specific.” Choose the PCM (engine/transmission module). : Terry's tool became a staple on forums like Scantool

Connect a cheap USB scope or use high-speed data logging. covering: On your scanner

Unlocking Deep Diagnostics: A Guide to the GM Mode 22 Scan Tool by Terry