GM
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Brake Booster Vacuum Sensor Circuit Low Vacuum
Cause:
    No PCM or TCM codes set, 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, then the PCM detected a Brake Booster Vacuum input of 5 kPa or less for 16 seconds