The child tax credit can only reduce your tax liability down to zero. It is not a refund. If you have no tax due, then you may not receive the full amount of the $1000 Child Tax Credit
If your child turned 17 at any time during 2016, then you will not receive the child tax credit.
If you are claiming the Child Tax Credit for a child who was born in 2016, make sure you said in Personal Info that the child lived with you all year and that you entered the child’s SSN.
If your child turned 17 in 2016, even on the last day of 2016, you do not get the child tax credit. There are no exceptions to the rule. You can still claim your child as a dependent.