The following are known Action Replay Codes for Earthworm Jim 2 on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
0521a907
dd625b20
c03e7d55
5d817aa6

Infinite Health
4a9b5c87
fad6b223

Infinite Lives
ae60bd77
95cb12e7

Infinite Machine Gun
1258217f
83888933

Infinite Missile Gun
1435300c
3767013c

Infinite Bubble Gun
d9f1fbdd
a2416b86

Infinite Barn Blaster
7ba589d0
c3da3e76