What is GM Tech2:
The GM Tech2 Scanner, working with TIS2000 software, supports onboard diagnostics and full bi-directional control when performing powertrain, chassis and body diagnostics for GM/SAAB/OPEL/SUZUKI/ISUZU/Holden.
What is HP Tuners:
The HP Tuners vcm suite is the most feature rich, powerful and comprehensive vcm/PCM reprogramming and diagnostics package available on the market today. Vcm suite is the ultimate tuning tool designed for basic Tuners to advanced tuning shops.
GM Tech 2 vs. HP Tuners:
HPT can only work with ECM and TCM
Tech II can work with ABS, BCM, etc. (all systems)
But, Tech 2 can only change/do stuff GM intended where HPT can change all kinds of tables GM wouldn’t want us messing with
So both have pluses/minuses depending on what you want to do
Tech 2 scan tool:
confirmed to works good for ALL systems
I just checked my OBD2 scan tool Tech II clone against my 2006 C6. In the ABS section there is an “Automated Bleed” option. In the Radiosection there is a “VIN Relearn” option. I’ve never actually used either one, but I bet it works.
The Tech II clone is literally running the same software as the GM Tech 2 Scanner, so it has all the same functions. There are a few caveats: the standard clone power supply will cause the unit to reset if you run the starter motor, apparently, though this can be fixed. Also, operating while tethered to a PC involves a bunch of licensing hacks and other nonsense. But you only need to do that if you want to flash the ECU firmware.
The Tech II lets you see (and individually reset) all the DTCs from all the modules. It also has a bunch of special functions and bidirectional capabilities.
It’s great as a standalone diagnostics tool but it isn’t intended to modify ECU parameters like tuning software does. This is a tool for fixing the car, not modifying it.