TurboTax does not receive any further information regarding tax returns once accepted by the IRS. You should get a letter from the government explaining why you didn't get the entire refund. You can also get this information by looking up your refund at the IRS Where's My Refund page.
Please see the TurboTax FAQ below for additional information as to why your refund came in less than expected: Why is my direct-deposited refund or check lower than the amount in TurboTax?
