General Information

Active Hydraulic Booster
C2380 Valve Relay Error - General Information

Component Location





General Description

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 hydralic pressure supplied to hydraulic booster line and pedal simulator.

DTC Description

The AHB ECU monitors the operation of the valves by checking the solenoid circuit current and sets this code if an incorrect current is detected.

DTC Detecting Condition





Diagnostic Circuit Diagram