P1578 – Brake Booster Vacuum Sensor Circuit Low Vacuum

P1578 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1578 Possible Causes

Faulty Brake Booster Vacuum (BBV) sensor,Brake Booster Vacuum (BBV) sensor harness is open or shorted,Brake Booster Vacuum (BBV) sensor circuit poor electrical connection

P1578 Description

During engine speed at 500 rpm or more for 20 seconds, brakes not applied, BARO input at 72 kPa or more, MAP input at 60 kPa or less, the Powertrain Control Module (PCM) detects the Brake Booster Vacuum (BBV) input of 5 kPa or less for 16 seconds.