My new gm techii device bought from https://www.obd2tool.com/goods-1568-GM+Tech2+GM+Scanner+-CANdi++TIS+(Works+for+GMSAABOPELSUZUKIISUZUHolden).html
Here has a lot of folks give 5star,I believe folk’s choice.
It is in perfect working order and has the screen cover.
Also included is the TIS2000 software which you will need to access the security to program keys.
My Tech 2 (clone, works great) for my C5 (99) just for the Automated Bleed so I could completely flush the brakesystem particularly for the EBCM !!! Have since used the crap out of it, ECM/PCM re-learn, crank sensor re-learn etc !!!!
Also use it to exercise my ABS motor every 3 months.
C5 has the built in ability to pull vehicle specific DTC’s right in the DIC and those can be exceptionally helful in diagnosing and correcting common C5 issues.
There are a number of functions in addition to diagnostic trouble shooting that can be accomplished with the Professional Diagnostic Tool Tech II.
and another is the ability to program out unwanted features such as F45 or F55 RPO’s ar program RPO’s into a replacement BCM.
Do recognize that the tool have extremely limited ability to change settings in either the PCM or BCM. To accomplish change you need a programming tool such as HP Tuners or EFI Live and they can change only PCM settings.
they’re very easy to use,just follow the display,and look around till you get tired,,and try reading ”live data” as much as you can,it speeds up the learning curve,,and try it on as many GM cars/trucks as you can too.