Activate the following cheats by entering the corresponding sequences of buttons at "Main Menu" > "Cheat Codes".

CHEAT FUNCTION - CHEAT CODE
All Cairo Missions and Zones - R3, TRIANGLE, X, TRIANGLE, L3, L1.
All Deep Si Missions and Zones - SQUARE, R1, TRIANGLE, CIRCLE, X, L1.
All East Coast Missions and Zones - R3, L3, R1, X, CIRCLE, SQUARE.
All Shanghai Missions and Zones - TRIANGLE, L3, R3, L1, TRIANGLE, X.
All West Coast Missions and Zones - L1, R1, R3, TRIANGLE, R3, CIRCLE.
All Upgrades - L1, TRIANGLE, L1, CIRCLE, SQUARE, SQUARE.
Always in Overdrive Mode - L1, CIRCLE, L1, X, SQUARE, R3.
Extra Energon (4X from defeated enemies) - TRIANGLE, SQUARE, CIRCLE, R3, X, TRIANGLE.
Increased Enemy Accuracy - TRIANGLE, TRIANGLE, CIRCLE, X, SQUARE, L1.
Increased Enemy Damage - L1, TRIANGLE, X, TRIANGLE, R3, R3.
Increased Enemy Health - CIRCLE, SQUARE, L1, CIRCLE, R3, TRIANGLE.
Increased Weapon Damage in Root Form - TRIANGLE, TRIANGLE, R3, X, L1, TRIANGLE
Increased Weapon Damage in Vehicle Form- TRIANGLE, CIRCLE, R1, SQUARE, R3, L3.
Invincibility - R3, X, SQUARE, L3, SQUARE, SQUARE.
Low Gravity Mode(jump higher and longer)- SQUARE, SQUARE, TRIANGLE, L3, TRIANGLE, L3.
Lower Enemy Accuracy - SQUARE, L3, R3, L3, R3, R1.
Melee Instant Kill - R3, X, L1, CIRCLE, R3, L1.
No Special Cool Down Time - R3, SQUARE, R3, R3, SQUARE, X.
No Weapon Overheat - L3, SQUARE, X, L3, TRIANGLE, L1.
Play as Autobot Protectobot Scout MP (singleplayer only, does not work in Deep 6) - R3, L1, L1, TRIANGLE, SQUARE, X.
Plays as Decepticon Seeker Warrior MP (singleplayer only) - SQUARE, TRIANGLE, SQUARE, L1, X, L1.
Plas as G1 Starscream - CIRCLE, X, CIRCLE, R1, TRIANGLE, R1.
Play as Gold Optimus Prime(multiplayer mode) - UP, DOWN, LEFT(2), RIGHT, DOWN.
Play as Gold Megatron(multiplayer mode) - DOWN, UP, RIGHT(2), LEFT, UP.
Special Kill Only - CIRCLE, CIRCLE, R1, CIRCLE, X, L3.
Unlimited Turbo - CIRCLE, L3, SQUARE, R3, X, TRIANGLE.