Gm Mode 22 Scan Tool By Terry Repack

Ever have a truck that stumbles but doesn't throw a code? Standard scanners might show a "green light," but Mode 22 can show you that your Long Term Fuel Trims are drifting or that a specific sensor is reporting "noise" just outside the standard threshold.

Disclaimer: The original author "Terry" (full identity and version lineage vary across forums) released this tool as freeware for personal use. Always verify compatibility with your specific ECM ID before use. gm mode 22 scan tool by terry

Connect a cheap USB scope or use high-speed data logging. Ever have a truck that stumbles but doesn't throw a code

Overall, the GM Mode 22 scan tool by Terry is a valuable diagnostic tool that can help technicians and repair shops improve their efficiency and accuracy when working on GM vehicles. Always verify compatibility with your specific ECM ID

The isn't for the person who just wants to turn off a gas cap light. It is a precision instrument for the "garage scientist." It provides a window into the brain of your GM vehicle that was previously reserved for dealership technicians with Tech2 scanners.