The contact owns a 2015 BMW X5. The contact stated that the vehicle was experiencing battery drainage. The vehicle was taken to the dealer, where the battery was replaced twice; however, the failure persisted. The dealer informed the contact that the auxiliary water pump was continuously running after turning off the vehicle. The dealer diagnosed the vehicle with parasitic battery draw due to the auxiliary water pump malfunction. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 123,000.