DTC P0555: General Description
The brake booster pressure sensor measures the change in the pressure of the brake booster. The signal from the brake booster pressure sensor is low voltage at low pressure and high voltage at high pressure. The powertrain control module (PCM) compares the expected voltage to the brake booster pressure sensor output voltage. When the brake booster pressure sensor output voltage is higher than the expected voltage for a set time, the PCM detects a malfunction and stores a DTC.