Hydraulic Control Unit (HCU)

The HCU contains the solenoid valves, the hydraulic pump motor and the pressure sensor used by the ABS for the ABS and stability control systems. The ABS module and the HCU are serviced as an assembly.

While the ABS module can be serviced separately from the HCU, a new HCU comes with a new ABS module.

When a new HCU and ABS module assembly is installed, the module must be programmed with the current vehicle configuration information. For additional information on module programming, Refer to: Module Configuration - System Operation and Component Description .

When a new component has been installed, the ABS module must be calibrated. The calibration procedure is required for the stability control sensors to learn the zero-position of the vehicle which means the vehicle must be on a level surface and not moving. The ABS Calibration procedure is carried out using a diagnostic scan tool.