The following are known Action Replay Codes for NBA Jam 2002 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
ec13afed
e9eeb9b9
a4525cb9
ed123a4d

CPU Score 0
aeaf2f50
6cbab75b
fb0e54d7
c4aba94b
2bd62058
ec552924

CPU Score 999
cc96bb73
299ad10f
55ac3e9c
f4943c14
f0828c67
35c6538e

P1 Scores 0
d00f7e15
f6e6d04a
b41deefd
6daa916d
dff90d6f
a4581bab

P1 Scores 999
58df273d
7f1fb687
76bfa59f
47a53e7e
3317f64b
d3352fdc

Never Lose-Horse
4fc6ab7c
69472b8e

No shot Clock
2cf27550
5a4c5c66

Infinite Turbo
64b27946
edd458d6
2b31fb86
5307aa31