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Before diving into the tool itself, it’s important to understand the protocol. Standard OBDII diagnostics use "Modes" (like Mode 01 for live data and Mode 03 for stored codes). These are federally mandated and universal across all brands.
Standard OBDII data can be "laggy." Terry’s Mode 22 tool optimizes the request-response cycle, giving you near real-time data which is critical for diagnosing intermittent misfires or tuning fuel maps. gm mode 22 scan tool by terry
You cannot access Mode 22 with a $20 code reader. Terry recommends: Before diving into the tool itself, it’s important
: It was developed as a free alternative to expensive professional tools like the or modern GDS2 systems. Key Technical Capabilities Enhanced PID Access Standard OBDII data can be "laggy
It displays sensor readings in real-time, updating several times per second. This allows you to watch how sensors respond to throttle changes, engine load, and temperature shifts—critical for diagnosing intermittent issues.
While it will read standard "Check Engine" codes (Mode 9), it also accesses manufacturer-specific codes that generic tools miss. This includes transmission codes (on vehicles with electronic automatics like the 4L60/4L80E) and body control module codes.
Unlike Mode 01, Mode 22 uses . Here are Terry’s “most-saved-my-butt” PIDs for a typical V8 truck (P01/P59 PCM):
Before diving into the tool itself, it’s important to understand the protocol. Standard OBDII diagnostics use "Modes" (like Mode 01 for live data and Mode 03 for stored codes). These are federally mandated and universal across all brands.
Standard OBDII data can be "laggy." Terry’s Mode 22 tool optimizes the request-response cycle, giving you near real-time data which is critical for diagnosing intermittent misfires or tuning fuel maps.
You cannot access Mode 22 with a $20 code reader. Terry recommends:
: It was developed as a free alternative to expensive professional tools like the or modern GDS2 systems. Key Technical Capabilities Enhanced PID Access
It displays sensor readings in real-time, updating several times per second. This allows you to watch how sensors respond to throttle changes, engine load, and temperature shifts—critical for diagnosing intermittent issues.
While it will read standard "Check Engine" codes (Mode 9), it also accesses manufacturer-specific codes that generic tools miss. This includes transmission codes (on vehicles with electronic automatics like the 4L60/4L80E) and body control module codes.
Unlike Mode 01, Mode 22 uses . Here are Terry’s “most-saved-my-butt” PIDs for a typical V8 truck (P01/P59 PCM):
