No one at TurboTax will know about it. The IRS does not share any information about your tax return with TurboTax after you file. The "error" could be a variety of things---sometimes they give you a list of the possible errors----like an incorrect SSN, incorrect amount claimed for the recovery rebate credit, income you reported incorrectly, income you left out, etc. etc. Your only source of information about your tax return is the IRS.