There is no on board programming for the Cobalt. You need a TechII or bring it to an automotive locksmith..
Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716
Never drive faster than your guardian angel can fly