An industry change in protocol from OBD II to Controller Area Network (CAN) has begun. In order to perform diagnostics on a vehicle that uses the CAN interface, you will need the Tech 2 Flash and a CAN diagnostic interface module.

The CANdi module connects between the Tech 2 Flash? Diagnostic Link Cable and the OBD adapter. Once the CANdi module is connected, it can be used on all GM vehicle applications, even those vehicles using other platforms such as OBD I and II. As of this printing, the following GM vehicles.

The following GM vehicles utilize the CAN interface:
- 05 Buick Allure (3.6L)
- 05 Buick LaCrosse (3.6L)
- 05 Buick Rainier (5.3L)
- 04-05 Buick Rendezvous (3.6L)
- 04-05 Cadillac CTS (3.6L)
- 04-05 Cadillac SRX (3.6L / 4.6L)
- 04-05 Cadillac XLR (4.6L)
- 05 Cadillac STS (3.6L / 4.6L)
- 05 Chevrolet Cobalt (2.2L)
- 05 Chevrolet Corvette (6.0L) 
- 05 Chevrolet Equinox (3.4L)
- 05 Chevrolet TrailBlazer (5.3L)
- 05 Chevrolet SSR (6.0L)
- 04 Chevrolet Malibu (Body/Chassis only)
- 05 Chevrolet Malibu (3.5L)
- 05 GMC Envoy (5.3L)
- 05 Pontiac G6 (3.5L)
- 05 Pontiac GTO (6.0L)
- 05 Pontiac Pursuit (2.2L)
- 03-05 Saturn ION (2.2L) 
- Other GM vehicles may also adopt the CAN protocol in the future.