The code 1 is almost certainly correct. Code G cannot be used with any Form 1099-R that shows tax withholding. Code 1 is correct if the distribution was paid to you and you subsequently rolled the distribution over to another retirement account within 60 days. Code G is only used for distributions paid directly from the original account to the receiving account without the money ever having been paid to you personally.
When you enter the code 1 Form 1099-R, indicate that you moved the money to another retirement account, then indicate the amount that was rolled over. TurboTax will include the entire box 1 amount on Form 1040 line 4c but will exclude from line 4d the amount rolled over. The word ROLLOVER will appear next to the line.
