DTC C2380-01: ABS/TCS/ESP Valve Error: General Description
The IEB is composed of a Electronic Control Unit (ECU) and an Hydraulic Control Unit (HCU), so the IEB hardware includes all solenoid valves inside the unit as well as the ECU.
Solenoid valves are switched to "ON", "OFF" by IEB when the ABS is activated. Solenoid valves function is to increase, decrease or maintain the hydraulic pressure supplied to a wheel cylinder.