For Chevrolet 1999-2010 models made in Latin America ICC can calculate 4 digit immobilizer PIN code by VIN.
Set type of calculation method to VIN2PIN and enter required data. In few seconds ICC will calculate a PIN code for immobilizer programming.
Supported WMIs are 3G1, 3GY, 8AG, 93C, W0L. For not supported cars you need to calculate PIN code by dump.