DTC C1234: High Pressure Accumulator Long Term Charge Error: General Description

There are three pressure sensors in HPU (Hydraulic Power Unit). They each measure high pressure accumulator pressure, booster pressure, pedal simulator pressure. IBAU (Integrated Brake Actuation Unit) uses these measured values to monitor AHB operating status and control AHB.

After replacing IBAU, pressure sensor calibration and PTS calibration are essential.