The following are known Action Replay Codes for The Polar Express 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
1d3f8de2
21b1d34a
4ac4a19b
2daba66f

Infinite Health
9162523a
610c9b43

Infinite Lives
b6b4bd04
0cc74e69

Max Candy Canes
7b35a98f
b35b35e4

All Sleigh Bells
b06d3b50
12564ac9

Super Jump
0d96f2da
350ecdf5
ead0ba5c
13901359