GTA The Trilogy — The Definitive Edition features many of the original games' cheat codes, but not all of them. Producer Rich Rosado told USA Today that some needed to be cut for technical reasons, though Rosado didn't elaborate or reveal the specific cheat codes that don't work.
The updated versions of GTA III, Vice City, and San Andreas were developed by Grove Street Games using the Unreal Engine. The engine is apparently one of the reasons why some of the cheat codes didn't make the cut. In
Read more on gamespot.com