The older clones didn't have this defect. It seems to be in almost all of them made in the last 2-3 years. Without the fix, it will read the ECU, and that's it, and it will not run most of the diagnostics on it. It will also only read the ECU (PCM) on all other 2005 down Chryslers. With the mod in place, it reads everything. For almost all other 2006+ Chryslers, it will work fine, without the fix.