The contact owns a 2018 Ram 2500 The contact stated while driving at an undisclosed speed, the contact noticed a beeping sound with the ABS warning light illuminated. The contact received notification of NHTSA Campaign Number: 24V896000 (Service Brakes, Hydraulic). The vehicle was taken to the dealer where it was diagnosed that the hydraulic control unit (HCU) had failed and needed to be replaced. The dealer confirmed that parts were not yet available. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was opened. The approximate failure mileage was 91,000. VIN tool confirms parts not available.