How much should it cost to replace the AWD system in a Mazda CX5?

Hello, You cannot "replace the AWD system". The All Wheel Drive system is made up of many different individual components. First one must determine what is not working properly so that area can be repaired. When you say that "water (was) sucked into the AWD" do you mean into then rear differential? Or some other component? A hands on assessment is needed to determine what is needed for repair. Seek guidance at a shop near you. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.