CP2000 Notice Received - How Will This Affect My Current Tax Refund?

Hello, 


I received a cp2000 that is asking me to agree or disagree with an adjustment to my previous year taxes where I owe $4400.00. I do not agree with this amount and I plan on filing an extension so that I can look into the previous year. I already efiled my taxes for this year with Turbo tax and they were accepted by the IRS. Will my current tax refund be delayed even though the process isn't completed and there is no current determination or decision of whether I truly owe or not? Or will they go ahead and send my refund because the CP2000 process is not yet complete and there is no determination?


Thank you in advance for your answer.