Delete the game data utility (not save data) for GT6 from Game Data Utility . Then reinstall the game and updates sequentially. Corruption often occurs when skipping intermediate updates.
: Launch GT6. The game will recognize the new data and begin an internal installation process. Wait for this to finish. Gran Turismo 6 Ps3 Update 1.22 Download - Google
Surprisingly, the PlayStation Network store on the PS3 still hosts update files for legacy games. When you insert the GT6 disc and connect to the internet, the console should automatically prompt you to download the latest patch data. Delete the game data utility (not save data)