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Home >> GMC >> 1999 >> Forward Control 6.5 F, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0453-P0656 >> DTC P0571 >> DTC P0571: Brake Switch Signal Invalid (1.9L SATURN) >> Circuit Description

Circuit Description

DTC will set if vehicle speed has cycled from 0-37 MPH 5 times without seeing a change in brake status. If DTC P0571 is present and DTC P0572 or P0573 is not present, then the PCM has failed internally.