2003 Toyota Tundra cant scan computer

Hello there I gota 2003 toyota tundra 4 door crew cab, and the check engine light its on, I try to scan with 3 diferent obdII scanner and all send the message error, what can I do, this unit was manufactured in 2003 in indiana to sell on 2004 but it is 2003 how can you help the mecanic says that the socketits diferent but it was made in the us