From GTPlanet Game Guides

To find out what version of Gran Turismo 2 you have, read the following from pupik's website:

(Version 1.0) Car Wash says 5000 Cr, Muscle Car Cup licenses are incorrect, #6 Mark Martin's Taurus SHO as racing modification, 98.2% complete maximum.

(Version 1.1) Car Wash says 50 Cr, Muscle Car Cup licenses are incorrect, #6 Mark Martin's Taurus SHO is gone, 98.2% complete maximum.

(Version 1.2) Car Wash says 50 Cr, Muscle Car Cup licenses fixed, #6 Mark Martin's Taurus SHO is gone, 100% complete maximum.

Version 1.0 Codes

Road Tracks Complete, Access Arcade Credits, And Extra Cars Cheat Note: You must have Gameshark version 2.2 or better for this cheat code to work.

   50000A02 0000
   801C93F8 0505
   301C940C 0005

All Tracks In Time Trial Mode

   800F3652 0017

All Road Tracks In 1 Player Mode

   800F364E 0083

All Rally Tracks In 1 Player Mode

   800F3656 0027

All Road Tracks 2 Player Mode

   800F3658 0015

All Rally Tracks 2 Player Mode

   800F365A 0006

Access Ending Credits On Arcade Disc Cheat

   D01F068A FFFE
   80052580 0001
   D01F068A FFFE
   80052594 0001

Press Triangle During A Replay Or Demo To Play In It Cheat Created by Skywalker

   801D53A6 0003
   D00A9228 0100
   800A920C 0000
   D00A9228 0100
   801D52C6 0502

Start With $99,000,000+ Cheat

   800107A0 05F5
   800107A2 3C02

Player 1 Nitrous Boost Cheat

   D00A9228 4000
   800A99DE 0020
   D00A9228 4000
   800A99DA 0020

Press L1+R1/L2+R2 To Turn On/Off Player 1 Auto Pilot Cheat

   D00A9228 1010
   80000002 4D43
   D00A9228 2020
   80000002 0000
   D0000002 4D43
   800A9B2A 0004

Press R1+R2/L1+L2 To Turn On/Off Player 2 Auto Pilot Cheat

   D00A9228 3000
   80000004 4D43
   D00A9228 0030
   80000004 0000
   D0000004 4D43
   800AA66A 0004

Simulation Mode Cheats Start On Second Lap Cheat

   D00A99AC 0001
   800A99AC 0002

Quick Win Cheat ==

   D00A99AC 0000
   800A99AC 0002

Maximum Cash Cheat

   801D0FC8 E0FF
   801D0FCA 05F5

Any Car Can Play Any Circuit Cheat

   D00148E0 000C
   800148E2 1000

Money Never Decreases Cheat

   80017A42 2400
   80017D4A 2400

Stop Race Timer Cheat

   8002F810 0000
   80046E84 0000

All Gold Licenses Cheat

   50003CA4 0000
   801CA758 0400

Gold Licenses B

   801CC760 0400
   801CC804 0400
   801CC8A8 0400
   801CC94C 0400
   801CC9F0 0400
   801CCA94 0400
   801CCB38 0400
   801CCBDC 0400
   801CCC80 0400
   801CCD24 0400

Gold Licenses A

   801CC0F8 0400
   801CC19C 0400
   801CC240 0400
   801CC2E4 0400
   801CC388 0400
   801CC42C 0400
   801CC4D0 0400
   801CC574 0400
   801CC618 0400
   801CC6BC 0400

Gold Licenses I-C

   801CBB34 0400
   801CBBD8 0400
   801CBC7C 0400
   801CBD20 0400
   801CBDC4 0400
   801CBE68 0400
   801CBF0C 0400
   801CBFB0 0400
   801CC054 0400

Gold Licenses I-B

   801CB428 0400
   801CB4CC 0400
   801CB570 0400
   801CB614 0400
   801CB6B8 0400
   801CB75C 0400
   801CB800 0400
   801CB8A4 0400
   801CB948 0400
   801CB9EC 0400
   801CBA90 0400

Gold Licenses I-A

   801CADC0 0400
   801CAE64 0400
   801CAF08 0400
   801CAFAC 0400
   801CB050 0400
   801CB0F4 0400
   801CB198 0400
   801CB23C 0400
   801CB2E0 0400
   801CB384 0400

Gold Super License

   801CA758 0400
   801CA7FC 0400
   801CA8A0 0400
   801CA944 0400
   801CA9E8 0400
   801CAA8C 0400
   801CAB30 0400
   801CABD4 0400
   801CAC78 0400
   801CAD1C 0400 

---

Version 1.1 Codes

Simulation Mode Cheats

Any Car Can Play Any Circuit Cheat

   D00148E0 000C
   800148E2 1000

A Ton Of Cash Cheat

   801D1338 E0FF
   801D133A 05F5

All Gold Licenses Cheat Note: You must have Gameshark version 2.2 or better for this cheat code to work.

   50003CA4 0000
   801CAAC8 0400

Start On Second Lap Cheat

   D00A9A5C 0000
   800A9A5C 0002

---

Version 1.2 Codes

Quick Win Cheat

   D00A9F4C 0000
   800A9F4C 0002
   801D586A 0200

Arcade Mode Cheats Start On Second Lap Cheat

   D00A9F4C 0001
   800A9F4C 0002

Simulation Mode Cheats Any Car Can Play Any Circuit Cheat

   D00148E0 000C
   800148E2 1000

Maximum Cash Cheat

   801D156A 1525
   801D1568 E0FF

All Gold Licenses Cheat

   500045B4 0000
   801CACF8 0400

Gold Licenses B

   801CCD00 0400
   801CCDA4 0400
   801CCE48 0400
   801CCEEC 0400
   801CCF90 0400
   801CD034 0400
   801CD0D8 0400
   801CD17C 0400
   801CD220 0400
   801CD2C4 0400

Gold Licenses A

   801CC698 0400
   801CC73C 0400
   801CC7E0 0400
   801CC884 0400
   801CC982 0400
   801CC9CC 0400
   801CCA70 0400
   801CCB14 0400
   801CCBB8 0400
   801CCC5C 0400

Gold Licenses I-C

   801CC030 0400
   801CC0D4 0400
   801CC178 0400
   801CC21C 0400
   801CC2C0 0400
   801CC364 0400
   801CC408 0400
   801CC4AC 0400
   801CC550 0400
   801CC5F4 0400

Gold Licenses I-B

   801CB9B9 0400
   801CBA5D 0400
   801CBB01 0400
   801CBBA5 0400
   801CBC49 0400
   801CBCED 0400
   801CBD91 0400
   801CBE35 0400
   801CBED9 0400
   801CBF7D 0400

Gold Licenses I-A

   801CB360 0400
   801CB404 0400
   801CB4AB 0400
   801CB54C 0400
   801CB5F0 0400
   801CB694 0400
   801CB738 0400
   801CB7DC 0400
   801CB880 0400
   801CB924 0400

Gold Super License

   801CACF8 0400
   801CAD9C 0400
   801CAE40 0400
   801CAEE4 0400
   801CAF88 0400
   801CB02C 0400
   801CB0D0 0400
   801CB174 0400
   801CB218 0400
   801CB2BC 0400