What does code P1576 mean?

Q: What does code P1576 mean?

Brake Booster Vacuum Sensor Circuit High Voltage. P1576 on a GM vehicle means the powertrain control module (PCM) has detected an abnormally high voltage signal from the brake booster vacuum sensor circuit, which it uses to monitor the vacuum assist available for the brakes. The PCM expects the sensor's signal voltage to stay within a calibrated range that corresponds to engine vacuum, and a sustained high reading tells the module the circuit is open, shorted to voltage, or the sensor has failed.

DTC codes / GM codes / P1576

P1576 · GMBrake Booster Vacuum Sensor Circuit High Voltage

P1576 on a GM vehicle means the powertrain control module (PCM) has detected an abnormally high voltage signal from the brake booster vacuum sensor circuit, which it uses to monitor the vacuum assist available for the brakes. The PCM expects the sensor's signal voltage to stay within a calibrated range that corresponds to engine vacuum, and a sustained high reading tells the module the circuit is open, shorted to voltage, or the sensor has failed.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.