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Home >> Hyundai >> 2017 >> Sonata Plug-In Hybrid >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Active Hydraulic Booster (AHB) System Diagnosis (HEV)) >> DTC C2380: Valve Relay Error >> General Information >> General Description

General Information: General Description

WARNING: This page is about a different car, the 2015 Hyundai Sonata. However, it is still accessible from the selected car via links, so may be relevant.

The AHB (Active Hydraulic Brake System) is composed of a ECU (Electronic Control Unit) and a HPU (Hydraulic Power Unit), BAU (Brake Actuation Unit) so the AHB hardware includes all solenoid valves inside the unit as well as the ECU.

Solenoid valves are switched to ON, OFF by ECU when the AHB is activated. Solenoid valves function is to increase, decrease or maintain the hydraulic pressure supplied to hydraulic booster line and pedal simulator.

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