It's not the PCM box itself but the calibration operating system it is flashed with. There are lots of different model and type vehicles that could be flashed in that 0411 PCM. That is what determines if it has lean cruise capabilities or if it is enabled. As a rule the EPA did not allow GM to enable LC on domestic made for USA vehicles for emissions reasoons. Some GM Austrailian made Holdens had it enabled. There are ways to enable it though on certain calibrations if it is available and not enabled. Again it depends on the operating system. And don't expect to gain much in MPG with it enabled.