PCM Hammer allows you to read and write the firmware on the P01 and P59 powertrain control modules that were used in various General Motors vehicles from roughly 1999-2007.
Please be aware that while this app contains support for J2534 devices, some J2534 devices do not work with Windows Store apps. If you see an error message about LoadLibrary ErrorCode 126, you've got a J2534 device that doesn't work with the Windows Store. In that case, please install PCM Logger from the .zip file at https://github.com/LegacyNsfw/PcmHacks/releases/latest