If you're interested in learning more about the GM Mode 22 scan tool or want to purchase one, here are some additional resources to check out:
Terry warns about three common traps:
It is important to note that not every GM computer will respond to Mode 22; some older or specific systems rely on related modes like Mode 2A, making the protocol support a key point of research for developers and enthusiasts. gm mode 22 scan tool by terry
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The most powerful use case was the ability to define and query Custom PIDs . Unlike generic scanners that come with a fixed set of parameters, this tool allowed a user to manually enter the hexadecimal codes for specific GM data points and log their values. This was essential for troubleshooting problems that wouldn't trigger a standard fault code. For instance, one could diagnose a failing catalytic converter by comparing the bank 1 and bank 2 sensor readings, or get a precise view of spark retard to identify engine knock. If you're interested in learning more about the
FTDI or Prolific USB drivers are needed to establish a stable, high-baud-rate connection between the PC and the adapter. Step-by-Step Guide to Using the Tool
This feature transforms the tool from a "code reader" into a "repair tool," perfectly aligning with the persona of Terry. Unlike generic scanners that come with a fixed
If you’ve spent any time under the hood of a late-90s to mid-2000s General Motors vehicle, you’ve likely run into the limitations of generic OBD-II scanners. They’ll give you a check engine light code, but they won’t tell you why a 4L60E transmission is slipping or why the ABS light triggers on a bumpy road.
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.
The GM Mode 22 Scan Tool by Terry: Specialized Functionality