P1578 GMC - Brake Booster Vacuum Sensor Circuit Low Vacuum
- 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
- Engine Light ON (or Service Engine Soon Warning Light)
P1578 Gmc DescriptionDuring 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.
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