A scanner bought back in 2001 would not support the new EPA "CAN" OBD-II or "GMLAN" protocols used by GM to all the modules in the car and wire speeds used in 2005 and newer cars.

You'd have to buy the V5.1 since your old version's software and the hardware interface are outdated for what is required to support these new EPA and GM features.

Being CAN runs at a faster data rate best would be if you purchased the Ease scanner from us is to get the USB interface since CAN operates at 500 K baud which is much faster then the old EPA and GM VPW RS232 data rates.
Cost of the hardware/cables is $270 and then you choose the software options you want but most purchase from us the middle level software which is $149.

If really wanting top speed to do GMLAN functions then we also have a IEEE 20.11g wireless Ease interface which then handles 2 Mbp/s data throughput and a desktop or laptop can either do Ad-Hoc peer to peer wireless to the Ease interface or can even be set up where interface connects to a wireless LAN router and then even desktops without wireless can run the Ease scanner software and link to interface in the car via the wireless LAN router.
Cost of a wireless Ease interface is around $400 but being it supports full GMLAN you get our WARP speeds for scan and record and much more bi-directional control to other modules in the car.
Bi-directional allows multi commands to be made rather then in older versions one at a time.

What is cool is like at a racetrack the laptop running Ease scanner does not have to be in the car but rather where your pit is or anywhere within the distance the wireless will work to maintain connected to Ease interface in car.