There’s already been a trainer released over at cheathappens which allows unlimited health and $9,999,999 to be credited to you. You have to pay for it, however.

There’s also another mod that doesn’t require you to pay It’s located here. You’ll have to put that DLL in your game dir. This .dll will wrap the real xlive.dll so you will have access to the memory areas needed to be modified in order to get unlimited health. To get unlimited health, all you have to do is put the .dll in your folder, launch the game and use tsearch.

While your health is at 100%

Open process gtaiv>click the first magnifier glass under open process>search 200 in type floating>get hit by someone>hit the second magnifier glass and change to value decreased>do this until there are about 4 results>add them to your cheat list>check them so that the value is frozen. (This is just modifying a memory value so it doesn’t change)

Then, you should have unlimited health. Bullets will bounce right off. Explosions however, will still kill you. I’ve tested this method personally. Unlimited money is very similar, though I didn’t try that one. It might require artmoney, I’m not sure.

Next he’s working on overriding the save game function, which makes it so you can only load your own saves from your live account. Should be interesting, I’ll be watching because I find GTA games kind of boring. (the actual story) I usually just drive around and play with the police.